Articles | Volume 18, issue 22
Biogeosciences, 18, 5967–6029, 2021
https://doi.org/10.5194/bg-18-5967-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue: Understanding the Indian Ocean system: past, present and future...
Biogeosciences, 18, 5967–6029, 2021
https://doi.org/10.5194/bg-18-5967-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Reviews and syntheses
23 Nov 2021
Reviews and syntheses
| 23 Nov 2021
Reviews and syntheses: Physical and biogeochemical processes associated with upwelling in the Indian Ocean
Puthenveettil Narayana Menon Vinayachandran et al.
Related authors
Jack Giddings, Karen J. Heywood, Adrian J. Matthews, Manoj M. Joshi, Benjamin G. M. Webber, Alejandra Sanchez-Franks, Brian A. King, and Puthenveettil N. Vinayachandran
Ocean Sci., 17, 871–890, https://doi.org/10.5194/os-17-871-2021, https://doi.org/10.5194/os-17-871-2021, 2021
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Little is known about the impact of chlorophyll on SST in the Bay of Bengal (BoB). Solar irradiance measured by an ocean glider and three Argo floats is used to determine the effect of chlorophyll on BoB SST during the 2016 summer monsoon. The Southwest Monsoon Current has high chlorophyll concentrations (∼0.5 mg m−3) and shallow solar penetration depths (∼14 m). Ocean mixed layer model simulations show that SST increases by 0.35°C per month, with the potential to influence monsoon rainfall.
This article is included in the Encyclopedia of Geosciences
Venugopal Thushara, Puthenveettil Narayana Menon Vinayachandran, Adrian J. Matthews, Benjamin G. M. Webber, and Bastien Y. Queste
Biogeosciences, 16, 1447–1468, https://doi.org/10.5194/bg-16-1447-2019, https://doi.org/10.5194/bg-16-1447-2019, 2019
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Chlorophyll distribution in the ocean remains to be explored in detail, despite its climatic significance. Here, we document the vertical structure of chlorophyll in the Bay of Bengal using observations and a model. The shape of chlorophyll profiles, characterized by prominent deep chlorophyll maxima, varies in dynamically different regions, controlled by the monsoonal forcings. The present study provides new insights into the vertical distribution of chlorophyll, rarely observed by satellites.
This article is included in the Encyclopedia of Geosciences
Abhisek Chatterjee, Gouri Anil, and Lakshmi R. Shenoy
Ocean Sci., 18, 639–657, https://doi.org/10.5194/os-18-639-2022, https://doi.org/10.5194/os-18-639-2022, 2022
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Marine heatwaves refer to discrete, prolonged warm ocean conditions known to cause severe destruction in marine ecosystems. We find that coastal waters off the west coast of India have experienced a rapid multifold increase in heatwave days since the early 80s. This resulted in more frequent and longer marine heatwave events in the last decade. We show that the rapid warming in the Arabian Sea in the last decade is the primary cause of the observed enhanced heatwave events in this basin.
This article is included in the Encyclopedia of Geosciences
Helen E. Phillips, Amit Tandon, Ryo Furue, Raleigh Hood, Caroline C. Ummenhofer, Jessica A. Benthuysen, Viviane Menezes, Shijian Hu, Ben Webber, Alejandra Sanchez-Franks, Deepak Cherian, Emily Shroyer, Ming Feng, Hemantha Wijesekera, Abhisek Chatterjee, Lisan Yu, Juliet Hermes, Raghu Murtugudde, Tomoki Tozuka, Danielle Su, Arvind Singh, Luca Centurioni, Satya Prakash, and Jerry Wiggert
Ocean Sci., 17, 1677–1751, https://doi.org/10.5194/os-17-1677-2021, https://doi.org/10.5194/os-17-1677-2021, 2021
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Over the past decade, understanding of the Indian Ocean has progressed through new observations and advances in theory and models of the oceanic and atmospheric circulation. This review brings together new understanding of the ocean–atmosphere system in the Indian Ocean, describing Indian Ocean circulation patterns, air–sea interactions, climate variability, and the critical role of the Indian Ocean as a clearing house for anthropogenic heat.
This article is included in the Encyclopedia of Geosciences
Jack Giddings, Karen J. Heywood, Adrian J. Matthews, Manoj M. Joshi, Benjamin G. M. Webber, Alejandra Sanchez-Franks, Brian A. King, and Puthenveettil N. Vinayachandran
Ocean Sci., 17, 871–890, https://doi.org/10.5194/os-17-871-2021, https://doi.org/10.5194/os-17-871-2021, 2021
Short summary
Short summary
Little is known about the impact of chlorophyll on SST in the Bay of Bengal (BoB). Solar irradiance measured by an ocean glider and three Argo floats is used to determine the effect of chlorophyll on BoB SST during the 2016 summer monsoon. The Southwest Monsoon Current has high chlorophyll concentrations (∼0.5 mg m−3) and shallow solar penetration depths (∼14 m). Ocean mixed layer model simulations show that SST increases by 0.35°C per month, with the potential to influence monsoon rainfall.
This article is included in the Encyclopedia of Geosciences
Cora Hörstmann, Eric J. Raes, Pier Luigi Buttigieg, Claire Lo Monaco, Uwe John, and Anya M. Waite
Biogeosciences, 18, 3733–3749, https://doi.org/10.5194/bg-18-3733-2021, https://doi.org/10.5194/bg-18-3733-2021, 2021
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Microbes are the main drivers of productivity and nutrient cycling in the ocean. We present a combined approach assessing C and N uptake and microbial community diversity across ecological provinces in the Southern Ocean and southern Indian Ocean. Provinces showed distinct genetic fingerprints, but microbial activity varied gradually across regions, correlating with nutrient concentrations. Our study advances the biogeographic understanding of microbial diversity across C and N uptake regimes.
This article is included in the Encyclopedia of Geosciences
Tim Rixen, Greg Cowie, Birgit Gaye, Joaquim Goes, Helga do Rosário Gomes, Raleigh R. Hood, Zouhair Lachkar, Henrike Schmidt, Joachim Segschneider, and Arvind Singh
Biogeosciences, 17, 6051–6080, https://doi.org/10.5194/bg-17-6051-2020, https://doi.org/10.5194/bg-17-6051-2020, 2020
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The northern Indian Ocean hosts an extensive oxygen minimum zone (OMZ), which intensified due to human-induced global changes. This includes the occurrence of anoxic events on the Indian shelf and affects benthic ecosystems and the pelagic ecosystem structure in the Arabian Sea. Consequences for biogeochemical cycles are unknown, which, in addition to the poor representation of mesoscale features, reduces the reliability of predictions of the future OMZ development in the northern Indian Ocean.
This article is included in the Encyclopedia of Geosciences
Hideharu Sasaki, Shinichiro Kida, Ryo Furue, Hidenori Aiki, Nobumasa Komori, Yukio Masumoto, Toru Miyama, Masami Nonaka, Yoshikazu Sasai, and Bunmei Taguchi
Geosci. Model Dev., 13, 3319–3336, https://doi.org/10.5194/gmd-13-3319-2020, https://doi.org/10.5194/gmd-13-3319-2020, 2020
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A quasi-global eddying ocean hindcast simulation using a new version of our model, called OFES2, was conducted to overcome several issues in its previous version. OFES2 simulated oceanic fields from 1958 to 2016 with improved global sea surface temperature and salinity, water mass properties in the Indonesian and Arabian seas, and Niño3.4 and Indian Ocean Dipole indexes. The output from OFES2 will be useful in studying various oceanic phenomena with broad spatiotemporal scales.
This article is included in the Encyclopedia of Geosciences
Venugopal Thushara, Puthenveettil Narayana Menon Vinayachandran, Adrian J. Matthews, Benjamin G. M. Webber, and Bastien Y. Queste
Biogeosciences, 16, 1447–1468, https://doi.org/10.5194/bg-16-1447-2019, https://doi.org/10.5194/bg-16-1447-2019, 2019
Short summary
Short summary
Chlorophyll distribution in the ocean remains to be explored in detail, despite its climatic significance. Here, we document the vertical structure of chlorophyll in the Bay of Bengal using observations and a model. The shape of chlorophyll profiles, characterized by prominent deep chlorophyll maxima, varies in dynamically different regions, controlled by the monsoonal forcings. The present study provides new insights into the vertical distribution of chlorophyll, rarely observed by satellites.
This article is included in the Encyclopedia of Geosciences
Marion Kersalé, Tarron Lamont, Sabrina Speich, Thierry Terre, Remi Laxenaire, Mike J. Roberts, Marcel A. van den Berg, and Isabelle J. Ansorge
Ocean Sci., 14, 923–945, https://doi.org/10.5194/os-14-923-2018, https://doi.org/10.5194/os-14-923-2018, 2018
Alex R. Baker, Maria Kanakidou, Katye E. Altieri, Nikos Daskalakis, Gregory S. Okin, Stelios Myriokefalitakis, Frank Dentener, Mitsuo Uematsu, Manmohan M. Sarin, Robert A. Duce, James N. Galloway, William C. Keene, Arvind Singh, Lauren Zamora, Jean-Francois Lamarque, Shih-Chieh Hsu, Shital S. Rohekar, and Joseph M. Prospero
Atmos. Chem. Phys., 17, 8189–8210, https://doi.org/10.5194/acp-17-8189-2017, https://doi.org/10.5194/acp-17-8189-2017, 2017
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Man's activities have greatly increased the amount of nitrogen emitted into the atmosphere. Some of this nitrogen is transported to the world's oceans, where it may affect microscopic marine plants and cause ecological problems. The huge size of the oceans makes direct monitoring of nitrogen inputs impossible, so computer models must be used to assess this issue. We find that current models reproduce observed nitrogen deposition to the oceans reasonably well and recommend future improvements.
This article is included in the Encyclopedia of Geosciences
A. Singh, S. E. Baer, U. Riebesell, A. C. Martiny, and M. W. Lomas
Biogeosciences, 12, 6389–6403, https://doi.org/10.5194/bg-12-6389-2015, https://doi.org/10.5194/bg-12-6389-2015, 2015
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Stoichiometry of macronutrients in the subtropical ocean is important to understand how biogeochemical cycles are coupled. We observed that elemental stoichiometry was much higher in the dissolved organic-matter pools than in the particulate organic matter pools. In addition ratios vary with depth due to changes in growth rates of specific phytoplankton groups, namely cyanobacteria. These data will improve biogeochemical models by placing observational constraints on these ratios.
This article is included in the Encyclopedia of Geosciences
Y. Miyazawa, Y. Masumoto, S. M. Varlamov, T. Miyama, M. Takigawa, M. Honda, and T. Saino
Biogeosciences, 10, 2349–2363, https://doi.org/10.5194/bg-10-2349-2013, https://doi.org/10.5194/bg-10-2349-2013, 2013
Related subject area
Biogeochemistry: Coastal Ocean
Unprecedented summer hypoxia in southern Cape Cod Bay: an ecological response to regional climate change?
Interannual variabilities, long-term trends, and regulating factors of low-oxygen conditions in the coastal waters off Hong Kong
Causes of the extensive hypoxia in the Gulf of Riga in 2018
Trawling effects on biogeochemical processes are mediated by fauna in high-energy biogenic-reef-inhabited coastal sediments
Drought recorded by Ba∕Ca in coastal benthic foraminifera
A nitrate budget of the Bohai Sea based on an isotope mass balance model
Suspended particulate matter drives the spatial segregation of nitrogen turnover along the hyper-turbid Ems estuary
Benthic Alkalinity fluxes from coastal sediments of the Baltic and North Seas: Comparing approaches and identifying knowledge gaps
Marine CO2 system variability along the northeast Pacific Inside Passage determined from an Alaskan ferry
Reviews and syntheses: Spatial and temporal patterns in seagrass metabolic fluxes
Mixed layer depth dominates over upwelling in regulating the seasonality of ecosystem functioning in the Peruvian upwelling system
Temporal dynamics of surface ocean carbonate chemistry in response to natural and simulated upwelling events during the 2017 coastal El Niño near Callao, Peru
Pelagic primary production in the coastal Mediterranean Sea: variability, trends, and contribution to basin-scale budgets
Investigating the effect of nickel concentration on phytoplankton growth to inform the assessment of ocean alkalinity enhancement
Contrasting patterns of carbon cycling and dissolved organic matter processing in two phytoplankton–bacteria communities
Biophysical controls on seasonal changes in the structure, growth, and grazing of the size-fractionated phytoplankton community in the northern South China Sea
Seasonal dispersal of fjord meltwaters as an important source of iron and manganese to coastal Antarctic phytoplankton
Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
Particulate organic carbon dynamics in the Gulf of Lion shelf (NW Mediterranean) using a coupled hydrodynamic–biogeochemical model
Technical note: Novel triple O2 sensor aquatic eddy covariance instrument with improved time shift correction reveals central role of microphytobenthos for carbon cycling in coral reef sands
Long-term spatiotemporal variations in and expansion of low-oxygen conditions in the Pearl River estuary: a study synthesizing observations during 1976–2017
Fe-binding organic ligands in coastal and frontal regions of the western Antarctic Peninsula
Temporal variability and driving factors of the carbonate system in the Aransas Ship Channel, TX, USA: a time series study
Nitrogen loss processes in response to upwelling in a Peruvian coastal setting dominated by denitrification – a mesocosm approach
Retracing hypoxia in Eckernförde Bight (Baltic Sea)
The impact of the freeze–melt cycle of land-fast ice on the distribution of dissolved organic matter in the Laptev and East Siberian seas (Siberian Arctic)
The fate of upwelled nitrate off Peru shaped by submesoscale filaments and fronts
Coastal processes modify projections of some climate-driven stressors in the California Current System
Upwelling-induced trace gas dynamics in the Baltic Sea inferred from 8 years of autonomous measurements on a ship of opportunity
Destruction and reinstatement of coastal hypoxia in the South China Sea off the Pearl River estuary
Hypersaline tidal flats as important “blue carbon” systems: a case study from three ecosystems
Drivers and impact of the seasonal variability of the organic carbon offshore transport in the Canary upwelling system
Organic carbon densities and accumulation rates in surface sediments of the North Sea and Skagerrak
An observation-based evaluation and ranking of historical Earth system model simulations in the northwest North Atlantic Ocean
Characterizing the origins of dissolved organic carbon in coastal seawater using stable carbon isotope and light absorption characteristics
Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean
Chemical characterization of the Punta de Fuencaliente CO2-enriched system (La Palma, NE Atlantic Ocean): a new natural laboratory for ocean acidification studies
The seasonal phases of an Arctic lagoon reveal the discontinuities of pH variability and CO2 flux at the air–sea interface
The northern European shelf as an increasing net sink for CO2
Impacts of biogenic polyunsaturated aldehydes on metabolism and community composition of particle-attached bacteria in coastal hypoxia
A Lagrangian study of the contribution of the Canary coastal upwelling to the nitrogen budget of the open North Atlantic
Denitrification by benthic foraminifera and their contribution to N-loss from a fjord environment
A numerical model study of the main factors contributing to hypoxia and its interannual and short-term variability in the East China Sea
The effects of decomposing invasive jellyfish on biogeochemical fluxes and microbial dynamics in an ultra-oligotrophic sea
Using 226Ra and 228Ra isotopes to distinguish water mass distribution in the Canadian Arctic Archipelago
Factors controlling plankton community production, export flux, and particulate matter stoichiometry in the coastal upwelling system off Peru
Reconstructing extreme climatic and geochemical conditions during the largest natural mangrove dieback on record
Technical note: Measurements and data analysis of sediment–water oxygen flux using a new dual-optode eddy covariance instrument
The impact of intertidal areas on the carbonate system of the southern North Sea
Malcolm E. Scully, W. Rockwell Geyer, David Borkman, Tracy L. Pugh, Amy Costa, and Owen C. Nichols
Biogeosciences, 19, 3523–3536, https://doi.org/10.5194/bg-19-3523-2022, https://doi.org/10.5194/bg-19-3523-2022, 2022
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For two consecutive summers, the bottom waters in southern Cape Cod Bay became severely depleted of dissolved oxygen. Low oxygen levels in bottom waters have never been reported in this area before, and this unprecedented occurrence is likely the result of a new algae species that recently began blooming during the late-summer months. We present data suggesting that blooms of this new species are the result of regional climate change including warmer waters and changes in summer winds.
This article is included in the Encyclopedia of Geosciences
Zheng Chen, Bin Wang, Chuang Xu, Zhongren Zhang, Shiyu Li, and Jiatang Hu
Biogeosciences, 19, 3469–3490, https://doi.org/10.5194/bg-19-3469-2022, https://doi.org/10.5194/bg-19-3469-2022, 2022
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Deterioration of low-oxygen conditions in the coastal waters off Hong Kong was revealed by monitoring data over two decades. The declining wind forcing and the increasing nutrient input contributed significantly to the areal expansion and intense deterioration of low-oxygen conditions. Also, the exacerbated eutrophication drove a shift in the dominant source of organic matter from terrestrial inputs to in situ primary production, which has probably led to an earlier onset of hypoxia in summer.
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Stella-Theresa Stoicescu, Jaan Laanemets, Taavi Liblik, Māris Skudra, Oliver Samlas, Inga Lips, and Urmas Lips
Biogeosciences, 19, 2903–2920, https://doi.org/10.5194/bg-19-2903-2022, https://doi.org/10.5194/bg-19-2903-2022, 2022
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Coastal basins with high input of nutrients often suffer from oxygen deficiency. In summer 2018, the extent of oxygen depletion was exceptional in the Gulf of Riga. We analyzed observational data and found that extensive oxygen deficiency appeared since the water layer close to the seabed, where oxygen is consumed, was separated from the surface layer. The problem worsens if similar conditions restricting vertical transport of oxygen occur more frequently in the future.
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Justin C. Tiano, Jochen Depestele, Gert Van Hoey, João Fernandes, Pieter van Rijswijk, and Karline Soetaert
Biogeosciences, 19, 2583–2598, https://doi.org/10.5194/bg-19-2583-2022, https://doi.org/10.5194/bg-19-2583-2022, 2022
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This study gives an assessment of bottom trawling on physical, chemical, and biological characteristics in a location known for its strong currents and variable habitats. Although trawl gears only removed the top 1 cm of the seabed surface, impacts on reef-building tubeworms significantly decreased carbon and nutrient cycling. Lighter trawls slightly reduced the impact on fauna and nutrients. Tubeworms were strongly linked to biogeochemical and faunal aspects before but not after trawling.
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Inda Brinkmann, Christine Barras, Tom Jilbert, Tomas Næraa, K. Mareike Paul, Magali Schweizer, and Helena L. Filipsson
Biogeosciences, 19, 2523–2535, https://doi.org/10.5194/bg-19-2523-2022, https://doi.org/10.5194/bg-19-2523-2022, 2022
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The concentration of the trace metal barium (Ba) in coastal seawater is a function of continental input, such as riverine discharge. Our geochemical records of the severely hot and dry year 2018, and following wet year 2019, reveal that prolonged drought imprints with exceptionally low Ba concentrations in benthic foraminiferal calcium carbonates of coastal sediments. This highlights the potential of benthic Ba / Ca to trace past climate extremes and variability in coastal marine records.
This article is included in the Encyclopedia of Geosciences
Shichao Tian, Birgit Gaye, Jianhui Tang, Yongming Luo, Wenguo Li, Niko Lahajnar, Kirstin Dähnke, Tina Sanders, Tianqi Xiong, Weidong Zhai, and Kay-Christian Emeis
Biogeosciences, 19, 2397–2415, https://doi.org/10.5194/bg-19-2397-2022, https://doi.org/10.5194/bg-19-2397-2022, 2022
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We constrain the nitrogen budget and in particular the internal sources and sinks of nitrate in the Bohai Sea by using a mass-based and dual stable isotope approach based on δ15N and δ18O of nitrate. Based on available mass fluxes and isotope data an updated nitrogen budget is proposed. Compared to previous estimates, it is more complete and includes the impact of the interior cycle (nitrification) on the nitrate pool. The main external nitrogen sources are rivers contributing 19.2 %–25.6 %.
This article is included in the Encyclopedia of Geosciences
Gesa Schulz, Tina Sanders, Justus E. E. van Beusekom, Yoana G. Voynova, Andreas Schöl, and Kirstin Dähnke
Biogeosciences, 19, 2007–2024, https://doi.org/10.5194/bg-19-2007-2022, https://doi.org/10.5194/bg-19-2007-2022, 2022
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Estuaries can significantly alter nutrient loads before reaching coastal waters. Our study of the heavily managed Ems estuary (Northern Germany) reveals three zones of nitrogen turnover along the estuary with water-column denitrification in the most upstream hyper-turbid part, nitrate production in the middle reaches and mixing/nitrate uptake in the North Sea. Suspended particulate matter was the overarching control on nitrogen cycling in the hyper-turbid estuary.
This article is included in the Encyclopedia of Geosciences
Bryce Van Dam, Nele Lehmann, Mary Zeller, Andreas Neumann, Daniel Pröfrock, Marko Lipka, Helmuth Thomas, and Michael E. Böttcher
EGUsphere, https://doi.org/10.5194/egusphere-2022-161, https://doi.org/10.5194/egusphere-2022-161, 2022
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We quantified sediment-water exchange at shallow sites in the North and Baltic Seas. We found that porewater irrigation rates in the former were approximately twice as high as previously estimated, likely driven by relatively high bio-irrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from -35 µmol m-2 hr-1 (uptake) to 53 µmol m-2 hr-1 (release). We attribute this to low net denitrification, carbonate mineral (re)precipitation and sulfide (re)oxidation.
This article is included in the Encyclopedia of Geosciences
Wiley Evans, Geoffrey T. Lebon, Christen D. Harrington, Yuichiro Takeshita, and Allison Bidlack
Biogeosciences, 19, 1277–1301, https://doi.org/10.5194/bg-19-1277-2022, https://doi.org/10.5194/bg-19-1277-2022, 2022
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Information on the marine carbon dioxide system along the northeast Pacific Inside Passage has been limited. To address this gap, we instrumented an Alaskan ferry in order to characterize the marine carbon dioxide system in this region. Data over a 2-year period were used to assess drivers of the observed variability, identify the timing of severe conditions, and assess the extent of contemporary ocean acidification as well as future levels consistent with a 1.5 °C warmer climate.
This article is included in the Encyclopedia of Geosciences
Melissa Ward, Tye L. Kindinger, Heidi K. Hirsh, Tessa M. Hill, Brittany M. Jellison, Sarah Lummis, Emily B. Rivest, George G. Waldbusser, Brian Gaylord, and Kristy J. Kroeker
Biogeosciences, 19, 689–699, https://doi.org/10.5194/bg-19-689-2022, https://doi.org/10.5194/bg-19-689-2022, 2022
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Here, we synthesize the results from 62 studies reporting in situ rates of seagrass metabolism to highlight spatial and temporal variability in oxygen fluxes and inform efforts to use seagrass to mitigate ocean acidification. Our analyses suggest seagrass meadows are generally autotrophic and variable in space and time, and the effects on seawater oxygen are relatively small in magnitude.
This article is included in the Encyclopedia of Geosciences
Tianfei Xue, Ivy Frenger, A. E. Friederike Prowe, Yonss Saranga José, and Andreas Oschlies
Biogeosciences, 19, 455–475, https://doi.org/10.5194/bg-19-455-2022, https://doi.org/10.5194/bg-19-455-2022, 2022
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The Peruvian system supports 10 % of the world's fishing yield. In the Peruvian system, wind and earth’s rotation bring cold, nutrient-rich water to the surface and allow phytoplankton to grow. But observations show that it grows worse at high upwelling. Using a model, we find that high upwelling happens when air mixes the water the most. Then phytoplankton is diluted and grows slowly due to low light and cool upwelled water. This study helps to estimate how it might change in a warming climate.
This article is included in the Encyclopedia of Geosciences
Shao-Min Chen, Ulf Riebesell, Kai G. Schulz, Elisabeth von der Esch, Eric P. Achterberg, and Lennart T. Bach
Biogeosciences, 19, 295–312, https://doi.org/10.5194/bg-19-295-2022, https://doi.org/10.5194/bg-19-295-2022, 2022
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Oxygen minimum zones in the ocean are characterized by enhanced carbon dioxide (CO2) levels and are being further acidified by increasing anthropogenic atmospheric CO2. Here we report CO2 system measurements in a mesocosm study offshore Peru during a rare coastal El Niño event to investigate how CO2 dynamics may respond to ongoing ocean deoxygenation. Our observations show that nitrogen limitation, productivity, and plankton community shift play an important role in driving the CO2 dynamics.
This article is included in the Encyclopedia of Geosciences
Paula Maria Salgado-Hernanz, Aurore Regaudie-de-Gioux, David Antoine, and Gotzon Basterretxea
Biogeosciences, 19, 47–69, https://doi.org/10.5194/bg-19-47-2022, https://doi.org/10.5194/bg-19-47-2022, 2022
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For the first time, this study presents the characteristics of primary production in coastal regions of the Mediterranean Sea based on satellite-borne observations for the period 2002–2016. The study concludes that there are significant spatial and temporal variations among different regions. Quantifying primary production is of special importance in the marine food web and in the sequestration of carbon dioxide from the atmosphere to the deep waters.
This article is included in the Encyclopedia of Geosciences
Jiaying Abby Guo, Robert Strzepek, Anusuya Willis, Aaron Ferderer, and Lennart Thomas Bach
Biogeosciences Discuss., https://doi.org/10.5194/bg-2021-312, https://doi.org/10.5194/bg-2021-312, 2022
Revised manuscript accepted for BG
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Ocean alkalinity enhancement is a carbon removal method, but it may cause a significant perturbation of the ocean with trace metals such as Nickel (Ni). This study tested the effect of increasing Ni concentrations on phytoplankton growth and photosynthesis. We found that the response to Ni varied across the 11 phytoplankton species tested here but the majority were insensitive. This may be due to the use of nitrate as the nitrogen source and due to high ligand concentrations (low Ni2+) in media.
This article is included in the Encyclopedia of Geosciences
Samu Elovaara, Eeva Eronen-Rasimus, Eero Asmala, Tobias Tamelander, and Hermanni Kaartokallio
Biogeosciences, 18, 6589–6616, https://doi.org/10.5194/bg-18-6589-2021, https://doi.org/10.5194/bg-18-6589-2021, 2021
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Dissolved organic matter (DOM) is a significant carbon pool in the marine environment. The composition of the DOM pool, as well as its interaction with microbes, is complex, yet understanding it is important for understanding global carbon cycling. This study shows that two phytoplankton species have different effects on the composition of the DOM pool and, through the DOM they produce, on the ensuing microbial community. These communities in turn have different effects on DOM composition.
This article is included in the Encyclopedia of Geosciences
Yuan Dong, Qian P. Li, Zhengchao Wu, Yiping Shuai, Zijia Liu, Zaiming Ge, Weiwen Zhou, and Yinchao Chen
Biogeosciences, 18, 6423–6434, https://doi.org/10.5194/bg-18-6423-2021, https://doi.org/10.5194/bg-18-6423-2021, 2021
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Temporal change of plankton growth and grazing are less known in the coastal ocean, not to mention the relevant controlling mechanisms. Here, we performed monthly size-specific dilution experiments outside a eutrophic estuary over a 1-year cycle. Phytoplankton growth was correlated to nutrients and grazing mortality to total chlorophyll a. A selective grazing on small cells may be important for maintaining high abundance of large-chain-forming diatoms in this eutrophic system.
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Kiefer O. Forsch, Lisa Hahn-Woernle, Robert M. Sherrell, Vincent J. Roccanova, Kaixuan Bu, David Burdige, Maria Vernet, and Katherine A. Barbeau
Biogeosciences, 18, 6349–6375, https://doi.org/10.5194/bg-18-6349-2021, https://doi.org/10.5194/bg-18-6349-2021, 2021
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We show that for an unperturbed cold western Antarctic Peninsula fjord, the seasonality of iron and manganese is linked to the dispersal of metal-rich meltwater sources. Geochemical measurements of trace metals in meltwaters, porewaters, and seawater, collected during two expeditions, showed a seasonal cycle of distinct sources. Finally, model results revealed that the dispersal of surface meltwater and meltwater plumes originating from under the glacier is sensitive to katabatic wind events.
This article is included in the Encyclopedia of Geosciences
Jenny Hieronymus, Kari Eilola, Malin Olofsson, Inga Hense, H. E. Markus Meier, and Elin Almroth-Rosell
Biogeosciences, 18, 6213–6227, https://doi.org/10.5194/bg-18-6213-2021, https://doi.org/10.5194/bg-18-6213-2021, 2021
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Dense blooms of cyanobacteria occur every summer in the Baltic Proper and can add to eutrophication by their ability to turn nitrogen gas into dissolved inorganic nitrogen. Being able to correctly estimate the size of this nitrogen fixation is important for management purposes. In this work, we find that the life cycle of cyanobacteria plays an important role in capturing the seasonality of the blooms as well as the size of nitrogen fixation in our ocean model.
This article is included in the Encyclopedia of Geosciences
Tom Hull, Naomi Greenwood, Antony Birchill, Alexander Beaton, Matthew Palmer, and Jan Kaiser
Biogeosciences, 18, 6167–6180, https://doi.org/10.5194/bg-18-6167-2021, https://doi.org/10.5194/bg-18-6167-2021, 2021
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The shallow shelf seas play a large role in the global cycling of CO2 and also support large fisheries. We use an autonomous underwater vehicle in the central North Sea to measure the rates of change in oxygen and nutrients.
Using these data we determine the amount of carbon dioxide taken out of the atmosphere by the sea and measure how productive the region is.
These observations will be useful for improving our predictive models and help us predict and adapt to a changing ocean.
This article is included in the Encyclopedia of Geosciences
Gaël Many, Caroline Ulses, Claude Estournel, and Patrick Marsaleix
Biogeosciences, 18, 5513–5538, https://doi.org/10.5194/bg-18-5513-2021, https://doi.org/10.5194/bg-18-5513-2021, 2021
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The Gulf of Lion shelf is one of the most productive areas in the Mediterranean. A model is used to study the mechanisms that drive the particulate organic carbon (POC). The model reproduces the annual cycle of primary production well. The shelf appears as an autotrophic ecosystem with a high production and as a source of POC for the adjacent basin. The increase in temperature induced by climate change could impact the trophic status of the shelf.
This article is included in the Encyclopedia of Geosciences
Alireza Merikhi, Peter Berg, and Markus Huettel
Biogeosciences, 18, 5381–5395, https://doi.org/10.5194/bg-18-5381-2021, https://doi.org/10.5194/bg-18-5381-2021, 2021
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The aquatic eddy covariance technique is a powerful method for measurements of solute fluxes across the sediment–water interface. Data measured by conventional eddy covariance instruments require a time shift correction that can result in substantial flux errors. We introduce a triple O2 sensor eddy covariance instrument that by design eliminates these errors. Deployments next to a conventional instrument in the Florida Keys demonstrate the improvements achieved through the new design.
This article is included in the Encyclopedia of Geosciences
Jiatang Hu, Zhongren Zhang, Bin Wang, and Jia Huang
Biogeosciences, 18, 5247–5264, https://doi.org/10.5194/bg-18-5247-2021, https://doi.org/10.5194/bg-18-5247-2021, 2021
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In situ observations over 42 years were used to explore the long-term changes to low-oxygen conditions in the Pearl River estuary. Apparent expansion of the low-oxygen conditions in summer was identified, primarily due to the combined effects of increased anthropogenic inputs and decreased sediment load. Large areas of severe low-oxygen events were also observed in early autumn and were formed by distinct mechanisms. The estuary seems to be growing into a seasonal, estuary-wide hypoxic zone.
This article is included in the Encyclopedia of Geosciences
Indah Ardiningsih, Kyyas Seyitmuhammedov, Sylvia G. Sander, Claudine H. Stirling, Gert-Jan Reichart, Kevin R. Arrigo, Loes J. A. Gerringa, and Rob Middag
Biogeosciences, 18, 4587–4601, https://doi.org/10.5194/bg-18-4587-2021, https://doi.org/10.5194/bg-18-4587-2021, 2021
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Organic Fe speciation is investigated along a natural gradient of the western Antarctic Peninsula from an ice-covered shelf to the open ocean. The two major fronts in the region affect the distribution of ligands. The excess ligands not bound to dissolved Fe (DFe) comprised up to 80 % of the total ligand concentrations, implying the potential to solubilize additional Fe input. The ligands on the shelf can increase the DFe residence time and fuel local primary production upon ice melt.
This article is included in the Encyclopedia of Geosciences
Melissa R. McCutcheon, Hongming Yao, Cory J. Staryk, and Xinping Hu
Biogeosciences, 18, 4571–4586, https://doi.org/10.5194/bg-18-4571-2021, https://doi.org/10.5194/bg-18-4571-2021, 2021
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We used 5+ years of discrete samples and 10 months of hourly sensor measurements to explore temporal variability and environmental controls on pH and pCO2 at the Aransas Ship Channel. Seasonal and diel variability were both present but small compared to other regions in the literature. Despite the small tidal range, tidal control often surpassed biological control. In comparison with sensor data, discrete samples were generally representative of mean annual and seasonal carbonate chemistry.
This article is included in the Encyclopedia of Geosciences
Kai G. Schulz, Eric P. Achterberg, Javier Arístegui, Lennart T. Bach, Isabel Baños, Tim Boxhammer, Dirk Erler, Maricarmen Igarza, Verena Kalter, Andrea Ludwig, Carolin Löscher, Jana Meyer, Judith Meyer, Fabrizio Minutolo, Elisabeth von der Esch, Bess B. Ward, and Ulf Riebesell
Biogeosciences, 18, 4305–4320, https://doi.org/10.5194/bg-18-4305-2021, https://doi.org/10.5194/bg-18-4305-2021, 2021
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Upwelling of nutrient-rich deep waters to the surface make eastern boundary upwelling systems hot spots of marine productivity. This leads to subsurface oxygen depletion and the transformation of bioavailable nitrogen into inert N2. Here we quantify nitrogen loss processes following a simulated deep water upwelling. Denitrification was the dominant process, and budget calculations suggest that a significant portion of nitrogen that could be exported to depth is already lost in the surface ocean.
This article is included in the Encyclopedia of Geosciences
Heiner Dietze and Ulrike Löptien
Biogeosciences, 18, 4243–4264, https://doi.org/10.5194/bg-18-4243-2021, https://doi.org/10.5194/bg-18-4243-2021, 2021
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In recent years fish-kill events caused by oxygen deficit have been reported in Eckernförde Bight (Baltic Sea). This study sets out to understand the processes causing respective oxygen deficits by combining high-resolution coupled ocean circulation biogeochemical modeling, monitoring data, and artificial intelligence.
This article is included in the Encyclopedia of Geosciences
Jens A. Hölemann, Bennet Juhls, Dorothea Bauch, Markus Janout, Boris P. Koch, and Birgit Heim
Biogeosciences, 18, 3637–3655, https://doi.org/10.5194/bg-18-3637-2021, https://doi.org/10.5194/bg-18-3637-2021, 2021
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The Arctic Ocean receives large amounts of river water rich in terrestrial dissolved organic matter (tDOM), which is an important component of the Arctic carbon cycle. Our analysis shows that mixing of three major freshwater sources is the main factor that regulates the distribution of tDOM concentrations in the Siberian shelf seas. In this context, the formation and melting of the land-fast ice in the Laptev Sea and the peak spring discharge of the Lena River are of particular importance.
This article is included in the Encyclopedia of Geosciences
Jaard Hauschildt, Soeren Thomsen, Vincent Echevin, Andreas Oschlies, Yonss Saranga José, Gerd Krahmann, Laura A. Bristow, and Gaute Lavik
Biogeosciences, 18, 3605–3629, https://doi.org/10.5194/bg-18-3605-2021, https://doi.org/10.5194/bg-18-3605-2021, 2021
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In this paper we quantify the subduction of upwelled nitrate due to physical processes on the order of several kilometers in the coastal upwelling off Peru and its effect on primary production. We also compare the prepresentation of these processes in a high-resolution simulation (~2.5 km) with a more coarsely resolved simulation (~12 km). To do this, we combine high-resolution shipboard observations of physical and biogeochemical parameters with a complex biogeochemical model configuration.
This article is included in the Encyclopedia of Geosciences
Samantha A. Siedlecki, Darren Pilcher, Evan M. Howard, Curtis Deutsch, Parker MacCready, Emily L. Norton, Hartmut Frenzel, Jan Newton, Richard A. Feely, Simone R. Alin, and Terrie Klinger
Biogeosciences, 18, 2871–2890, https://doi.org/10.5194/bg-18-2871-2021, https://doi.org/10.5194/bg-18-2871-2021, 2021
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Future ocean conditions can be simulated using projected trends in fossil fuel use paired with Earth system models. Global models generally do not include local processes important to coastal ecosystems. These coastal processes can alter the degree of change projected. Higher-resolution models that include local processes predict modified changes in carbon stressors when compared to changes projected by global models in the California Current System.
This article is included in the Encyclopedia of Geosciences
Erik Jacobs, Henry C. Bittig, Ulf Gräwe, Carolyn A. Graves, Michael Glockzin, Jens D. Müller, Bernd Schneider, and Gregor Rehder
Biogeosciences, 18, 2679–2709, https://doi.org/10.5194/bg-18-2679-2021, https://doi.org/10.5194/bg-18-2679-2021, 2021
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We use a unique data set of 8 years of continuous carbon dioxide (CO2) and methane (CH4) surface water measurements from a commercial ferry to study upwelling in the Baltic Sea. Its seasonality and regional and interannual variability are examined. Strong upwelling events drastically increase local surface CO2 and CH4 levels and are mostly detected in late summer after long periods of impaired mixing. We introduce an extrapolation method to estimate regional upwelling-induced trace gas fluxes.
This article is included in the Encyclopedia of Geosciences
Yangyang Zhao, Khanittha Uthaipan, Zhongming Lu, Yan Li, Jing Liu, Hongbin Liu, Jianping Gan, Feifei Meng, and Minhan Dai
Biogeosciences, 18, 2755–2775, https://doi.org/10.5194/bg-18-2755-2021, https://doi.org/10.5194/bg-18-2755-2021, 2021
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In situ oxygen consumption rates were estimated for the first time during destruction of coastal hypoxia as disturbed by a typhoon and its reinstatement in the South China Sea off the Pearl River estuary. The reinstatement of summer hypoxia was rapid with a comparable timescale with that of its initial disturbance from frequent tropical cyclones, which has important implications for better understanding the intermittent nature of coastal hypoxia and its prediction in a changing climate.
This article is included in the Encyclopedia of Geosciences
Dylan R. Brown, Humberto Marotta, Roberta B. Peixoto, Alex Enrich-Prast, Glenda C. Barroso, Mario L. G. Soares, Wilson Machado, Alexander Pérez, Joseph M. Smoak, Luciana M. Sanders, Stephen Conrad, James Z. Sippo, Isaac R. Santos, Damien T. Maher, and Christian J. Sanders
Biogeosciences, 18, 2527–2538, https://doi.org/10.5194/bg-18-2527-2021, https://doi.org/10.5194/bg-18-2527-2021, 2021
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Hypersaline tidal flats (HTFs) are coastal ecosystems with freshwater deficits often occurring in arid or semi-arid regions near mangrove supratidal zones with no major fluvial contributions. This study shows that HTFs are important carbon and nutrient sinks which may be significant given their extensive coverage. Our findings highlight a previously unquantified carbon as well as a nutrient sink and suggest that coastal HTF ecosystems could be included in the emerging blue carbon framework.
This article is included in the Encyclopedia of Geosciences
Giulia Bonino, Elisa Lovecchio, Nicolas Gruber, Matthias Münnich, Simona Masina, and Doroteaciro Iovino
Biogeosciences, 18, 2429–2448, https://doi.org/10.5194/bg-18-2429-2021, https://doi.org/10.5194/bg-18-2429-2021, 2021
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Seasonal variations of processes such as upwelling and biological production that happen along the northwestern African coast can modulate the temporal variability of the biological activity of the adjacent open North Atlantic hundreds of kilometers away from the coast thanks to the lateral transport of coastal organic carbon. This happens with a temporal delay, which is smaller than a season up to roughly 500 km from the coast due to the intense transport by small-scale filaments.
This article is included in the Encyclopedia of Geosciences
Markus Diesing, Terje Thorsnes, and Lilja Rún Bjarnadóttir
Biogeosciences, 18, 2139–2160, https://doi.org/10.5194/bg-18-2139-2021, https://doi.org/10.5194/bg-18-2139-2021, 2021
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The upper 10 cm of the seafloor of the North Sea and Skagerrak contain 231×106 t of carbon in organic form. The Norwegian Trough, the deepest sedimentary basin in the studied area, stands out as a zone of strong organic carbon accumulation with rates on par with neighbouring fjords. Conversely, large parts of the North Sea are characterised by rapid organic carbon degradation and negligible accumulation. This dual character is likely typical for continental shelf sediments worldwide.
This article is included in the Encyclopedia of Geosciences
Arnaud Laurent, Katja Fennel, and Angela Kuhn
Biogeosciences, 18, 1803–1822, https://doi.org/10.5194/bg-18-1803-2021, https://doi.org/10.5194/bg-18-1803-2021, 2021
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CMIP5 and CMIP6 models, and a high-resolution regional model, were evaluated by comparing historical simulations with observations in the northwest North Atlantic, a climate-sensitive and biologically productive ocean margin region. Many of the CMIP models performed poorly for biological properties. There is no clear link between model resolution and skill in the global models, but there is an overall improvement in performance in CMIP6 from CMIP5. The regional model performed best.
This article is included in the Encyclopedia of Geosciences
Heejun Han, Jeomshik Hwang, and Guebuem Kim
Biogeosciences, 18, 1793–1801, https://doi.org/10.5194/bg-18-1793-2021, https://doi.org/10.5194/bg-18-1793-2021, 2021
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The main source of excess DOC occurring in coastal seawater off an artificial lake, which is enclosed by a dike along the western coast of South Korea, was determined using a combination of various biogeochemical tools including DOC and nutrient concentrations, stable carbon isotope, and optical properties (absorbance and fluorescence) of dissolved organic matter in two different seasons (March 2017 and September 2018).
This article is included in the Encyclopedia of Geosciences
Michelle N. Simone, Kai G. Schulz, Joanne M. Oakes, and Bradley D. Eyre
Biogeosciences, 18, 1823–1838, https://doi.org/10.5194/bg-18-1823-2021, https://doi.org/10.5194/bg-18-1823-2021, 2021
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Estuaries are responsible for a large contribution of dissolved organic carbon (DOC) to the global C cycle, but it is unknown how this will change in the future. DOC fluxes from unvegetated sediments were investigated ex situ subject to conditions of warming and ocean acidification. The future climate shifted sediment fluxes from a slight DOC source to a significant sink, with global coastal DOC export decreasing by 80 %. This has global implications for C cycling and long-term C storage.
This article is included in the Encyclopedia of Geosciences
Sara González-Delgado, David González-Santana, Magdalena Santana-Casiano, Melchor González-Dávila, Celso A. Hernández, Carlos Sangil, and José Carlos Hernández
Biogeosciences, 18, 1673–1687, https://doi.org/10.5194/bg-18-1673-2021, https://doi.org/10.5194/bg-18-1673-2021, 2021
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We describe the carbon system dynamics of a new CO2 seep system located off the coast of La Palma. We explored for over a year, finding points with lower levels of pH and alkalinity; high levels of carbon; and poorer levels of aragonite and calcite, both essential for calcifying species. The seeps are a key feature for robust experimental designs, aimed at comprehending how life has persisted through past eras or at predicting the consequences of ocean acidification in the marine realm.
This article is included in the Encyclopedia of Geosciences
Cale A. Miller, Christina Bonsell, Nathan D. McTigue, and Amanda L. Kelley
Biogeosciences, 18, 1203–1221, https://doi.org/10.5194/bg-18-1203-2021, https://doi.org/10.5194/bg-18-1203-2021, 2021
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We report here the first year-long high-frequency pH data set for an Arctic lagoon that captures ice-free and ice-covered seasons. pH and salinity correlation varies by year as we observed positive correlation and independence. Photosynthesis is found to drive high pH values, and small changes in underwater solar radiation can result in rapid decreases in pH. We estimate that arctic lagoons may act as sources of CO2 to the atmosphere, potentially offsetting the Arctic Ocean's CO2 sink capacity.
This article is included in the Encyclopedia of Geosciences
Meike Becker, Are Olsen, Peter Landschützer, Abdirhaman Omar, Gregor Rehder, Christian Rödenbeck, and Ingunn Skjelvan
Biogeosciences, 18, 1127–1147, https://doi.org/10.5194/bg-18-1127-2021, https://doi.org/10.5194/bg-18-1127-2021, 2021
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We developed a simple method to refine existing open-ocean maps towards different coastal seas. Using a multi-linear regression, we produced monthly maps of surface ocean fCO2 in the northern European coastal seas (the North Sea, the Baltic Sea, the Norwegian Coast and the Barents Sea) covering a time period from 1998 to 2016. Based on this fCO2 map, we calculate trends in surface ocean fCO2, pH and the air–sea gas exchange.
This article is included in the Encyclopedia of Geosciences
Zhengchao Wu, Qian P. Li, Zaiming Ge, Bangqin Huang, and Chunming Dong
Biogeosciences, 18, 1049–1065, https://doi.org/10.5194/bg-18-1049-2021, https://doi.org/10.5194/bg-18-1049-2021, 2021
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Seasonal hypoxia in the nearshore bottom waters frequently occurs in the Pearl River estuary. Aerobic respiration is the ultimate cause of local hypoxia. We found an elevated level of polyunsaturated aldehydes in the bottom water outside the estuary, which promoted the growth and metabolism of special groups of particle-attached bacteria and thus contributed to oxygen depletion in hypoxic waters. Our results may be important for understanding coastal hypoxia and its linkages to eutrophication.
This article is included in the Encyclopedia of Geosciences
Derara Hailegeorgis, Zouhair Lachkar, Christoph Rieper, and Nicolas Gruber
Biogeosciences, 18, 303–325, https://doi.org/10.5194/bg-18-303-2021, https://doi.org/10.5194/bg-18-303-2021, 2021
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Using a Lagrangian modeling approach, this study provides a quantitative analysis of water and nitrogen offshore transport in the Canary Current System. We investigate the timescales, reach and structure of offshore transport and demonstrate that the Canary upwelling is a key source of nutrients to the open North Atlantic Ocean. Our findings stress the need for improving the representation of the Canary system and other eastern boundary upwelling systems in global coarse-resolution models.
This article is included in the Encyclopedia of Geosciences
Constance Choquel, Emmanuelle Geslin, Edouard Metzger, Helena L. Filipsson, Nils Risgaard-Petersen, Patrick Launeau, Manuel Giraud, Thierry Jauffrais, Bruno Jesus, and Aurélia Mouret
Biogeosciences, 18, 327–341, https://doi.org/10.5194/bg-18-327-2021, https://doi.org/10.5194/bg-18-327-2021, 2021
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Marine microorganisms such as foraminifera are able to live temporarily without oxygen in sediments. In a Swedish fjord subjected to seasonal oxygen scarcity, a change in fauna linked to the decrease in oxygen and the increase in an invasive species was shown. The invasive species respire nitrate until 100 % of the nitrate porewater in the sediment and could be a major contributor to nitrogen balance in oxic coastal ecosystems. But prolonged hypoxia creates unfavorable conditions to survive.
This article is included in the Encyclopedia of Geosciences
Haiyan Zhang, Katja Fennel, Arnaud Laurent, and Changwei Bian
Biogeosciences, 17, 5745–5761, https://doi.org/10.5194/bg-17-5745-2020, https://doi.org/10.5194/bg-17-5745-2020, 2020
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In coastal seas, low oxygen, which is detrimental to coastal ecosystems, is increasingly caused by man-made nutrients from land. This is especially so near mouths of major rivers, including the Changjiang in the East China Sea. Here a simulation model is used to identify the main factors determining low-oxygen conditions in the region. High river discharge is identified as the prime cause, while wind and intrusions of open-ocean water modulate the severity and extent of low-oxygen conditions.
This article is included in the Encyclopedia of Geosciences
Tamar Guy-Haim, Maxim Rubin-Blum, Eyal Rahav, Natalia Belkin, Jacob Silverman, and Guy Sisma-Ventura
Biogeosciences, 17, 5489–5511, https://doi.org/10.5194/bg-17-5489-2020, https://doi.org/10.5194/bg-17-5489-2020, 2020
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The availability of nutrients in oligotrophic marine ecosystems is limited. Following jellyfish blooms, large die-off events result in the release of high amounts of nutrients to the water column and sediment. Our study assessed the decomposition effects of an infamous invasive jellyfish in the ultra-oligotrophic Eastern Mediterranean Sea. We found that jellyfish decomposition favored heterotrophic bacteria and altered biogeochemical fluxes, further impoverishing this nutrient-poor ecosystem.
This article is included in the Encyclopedia of Geosciences
Chantal Mears, Helmuth Thomas, Paul B. Henderson, Matthew A. Charette, Hugh MacIntyre, Frank Dehairs, Christophe Monnin, and Alfonso Mucci
Biogeosciences, 17, 4937–4959, https://doi.org/10.5194/bg-17-4937-2020, https://doi.org/10.5194/bg-17-4937-2020, 2020
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Major research initiatives have been undertaken within the Arctic Ocean, highlighting this area's global importance and vulnerability to climate change. In 2015, the international GEOTRACES program addressed this importance by devoting intense research activities to the Arctic Ocean. Among various tracers, we used radium and carbonate system data to elucidate the functioning and vulnerability of the hydrographic regime of the Canadian Arctic Archipelago, bridging the Pacific and Atlantic oceans.
This article is included in the Encyclopedia of Geosciences
Lennart Thomas Bach, Allanah Joy Paul, Tim Boxhammer, Elisabeth von der Esch, Michelle Graco, Kai Georg Schulz, Eric Achterberg, Paulina Aguayo, Javier Arístegui, Patrizia Ayón, Isabel Baños, Avy Bernales, Anne Sophie Boegeholz, Francisco Chavez, Gabriela Chavez, Shao-Min Chen, Kristin Doering, Alba Filella, Martin Fischer, Patricia Grasse, Mathias Haunost, Jan Hennke, Nauzet Hernández-Hernández, Mark Hopwood, Maricarmen Igarza, Verena Kalter, Leila Kittu, Peter Kohnert, Jesus Ledesma, Christian Lieberum, Silke Lischka, Carolin Löscher, Andrea Ludwig, Ursula Mendoza, Jana Meyer, Judith Meyer, Fabrizio Minutolo, Joaquin Ortiz Cortes, Jonna Piiparinen, Claudia Sforna, Kristian Spilling, Sonia Sanchez, Carsten Spisla, Michael Sswat, Mabel Zavala Moreira, and Ulf Riebesell
Biogeosciences, 17, 4831–4852, https://doi.org/10.5194/bg-17-4831-2020, https://doi.org/10.5194/bg-17-4831-2020, 2020
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The eastern boundary upwelling system off Peru is among Earth's most productive ocean ecosystems, but the factors that control its functioning are poorly constrained. Here we used mesocosms, moored ~ 6 km offshore Peru, to investigate how processes in plankton communities drive key biogeochemical processes. We show that nutrient and light co-limitation keep productivity and export at a remarkably constant level while stoichiometry changes strongly with shifts in plankton community structure.
This article is included in the Encyclopedia of Geosciences
James Z. Sippo, Isaac R. Santos, Christian J. Sanders, Patricia Gadd, Quan Hua, Catherine E. Lovelock, Nadia S. Santini, Scott G. Johnston, Yota Harada, Gloria Reithmeir, and Damien T. Maher
Biogeosciences, 17, 4707–4726, https://doi.org/10.5194/bg-17-4707-2020, https://doi.org/10.5194/bg-17-4707-2020, 2020
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In 2015–2016, a massive mangrove dieback event occurred along ~1000 km of coastline in Australia. Multiple lines of evidence from climate data, wood and sediment samples suggest low water availability within the dead mangrove forest. Wood and sediments also reveal a large increase in iron concentrations in mangrove sediments during the dieback. This study supports the hypothesis that the forest dieback was associated with low water availability driven by a climate-change-related ENSO event.
This article is included in the Encyclopedia of Geosciences
Markus Huettel, Peter Berg, and Alireza Merikhi
Biogeosciences, 17, 4459–4476, https://doi.org/10.5194/bg-17-4459-2020, https://doi.org/10.5194/bg-17-4459-2020, 2020
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Oxygen fluxes are a valued proxy for organic carbon production and mineralization at the seafloor. These fluxes can be measured non-invasively with the aquatic eddy covariance instrument, but the fast, fragile oxygen sensor it uses often causes questionable flux data. We developed a dual-O2-optode instrument and data evaluation method that allow improved flux measurements. Deployments over carbonate sands in the shallow shelf demonstrate that the instrument can produce reliable oxygen flux data.
This article is included in the Encyclopedia of Geosciences
Fabian Schwichtenberg, Johannes Pätsch, Michael Ernst Böttcher, Helmuth Thomas, Vera Winde, and Kay-Christian Emeis
Biogeosciences, 17, 4223–4245, https://doi.org/10.5194/bg-17-4223-2020, https://doi.org/10.5194/bg-17-4223-2020, 2020
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Ocean acidification has a range of potentially harmful consequences for marine organisms. It is related to total alkalinity (TA) mainly produced in oxygen-poor situations like sediments in tidal flats. TA reduces the sensitivity of a water body to acidification. The decomposition of organic material and subsequent TA release in the tidal areas of the North Sea (Wadden Sea) is responsible for reduced acidification in the southern North Sea. This is shown with the results of an ecosystem model.
This article is included in the Encyclopedia of Geosciences
Cited articles
Abdul Jaleel, K. U., Parameswaran, U. V., Gopal, A., Khader, C., Ganesh, T.,
Sanjeevan, V. N., Shunmugaraj, T., Vijayan, A. K., and Gupta, G. V. M.:
Evaluation of changes in macrobenthic standing stock and polychaete
community structure along the south eastern Arabian Sea shelf during the
monsoon trawl-ban, Cont. Shelf Res., 102, 9–18, 2015.
Allen, J. S.: Upwelling and coastal jets in stratified ocean, J. Phys.
Oceanography, 3, 245–257, 1973.
Alvheim, O., Torstensen, E., Fennessy, S., MacKay, F., Zaera, D., and
Bemiasa, J.: West Madagascar: Cruise Reports Dr Fridtjof Nansen. Pelagic
Ecosystem Survey SWIOFP/ASCLME/FAO, Cruise 2, 25 August–3 October 2009,
Preliminary report, Institute of Marine Research, Bergen, Norway, 2009.
Amol, P., Vinayachandran, P. N., Shankar, D, Thushara, V., Vijith, V., and
Abhisek Chatterjee: Effect of freshwater advection and winds on the vertical
structure of chlorophyII in the northern Bay of Bengal, Deep-Sea Res. Pt. II, 179, 104622, doi.org/10.1016/j.dsr2.2019.07.010, 2019.
Amol, P., Shankar, D., Fernando, V., Mukherjee, A., Aparna, S. G.,
Fernandes, R., Michael, G. S., Khalap, S. T., Satelkar, N. P., Agarvadekar,
Y., Gaonkar, M. G., Tari, A. P., Kankonkar, A., and Vernekar, S. P.:
Observed intraseasonal and seasonal variability of the West India Coastal
Current on the continental slope, J. Earth Syst. Sci., 123, 1045–1074,
https://doi.org/10.1007/s12040-014-0449-5, 2014.
Amol, P., Suchandan Bemal, Shankar, D., Jain, V., Thushara, V., Vijith, V.
and Vinayachandran, P. N.: Modulation of chlorophyll concentration by
downwelling Rossby waves during the winter monsoon in the southeastern
Arabian Sea, Prog. Oceanogr., 186, 102365,
doi.org/10.1016/j.pocean.2020.102365, 2020.
Amol, P.: Impact of Rossby waves on chlorophyll variability in the
southeastern Arabian Sea, Remote Sens. Lett., 9, 1214–1223,
doi.org/10.1080/2150704X, 2018.
Anderson, D. L. T. and Moore, D. W.: Cross-equatorial inertial jets with
special relevance to very remote forcing of the Somali Current, Deep-Sea
Res., 26, 1–22, https://doi.org/10.1016/0198-0149(79)90082-7, 1979.
Andrews, J. C.: Eddy structure and the West Australian current, Deep Sea
Res., 24, 1133–1148, https://doi.org/10.1016/0146-6291(77)90517-3, 1977.
Andruleit, H.: Status of the Java upwelling area (Indian Ocean) during the
oligotrophic northern hemisphere winter monsoon season as revealed by
coccolithophores, Mar. Micropaleontol., 64, 36–51,
https://doi.org/10.1016/j.marmicro.2007.02.001, 2007.
Andruleit, H., A. Luckge, M. Wiedicke, and S. Stäger:
Late Quaternary development of the Java upwelling system (eastern Indian
Ocean) as revealed by coccolithophores, Mar. Micropaleontol., 69, 3–15,
https://doi.org/10.1016/j.marmicro.2007.11.005, 2008.
Aparna, S. G., McCreary, J. P., Shankar, D., and Vinayachandran, P. N.:
Signatures of the Indian Ocean Dipole and El Nino-Southern Oscillation
events in sea level variations in the Bay of Bengal, J. Geophys. Res.,
117, C10012, https://doi.org/10.1029/2012JC008055, 2012.
Arìstegui, J., Barton, E. D., Aìlvarez Salgado, X. A., Santos, A. M. P.,
Figueiras, F. G., Kifani, S., Hernndez-Len, S., Mason, E., Mach, E., and
Demarcq, H.: Sub-regional ecosystem variability in the Canary Current
upwelling, Prog. Oceanogr., 83, 33–48, https://doi.org/10.1016/j.pocean.2009.07.031,
2009.
Asanuma, I., Matsumoto, K., Okano, H., Kawano, T., Hendiarti, N., and
Sachoemar, S. I.: Spatial distribution of phytoplankton along the Sunda
Islands: The monsoon anomaly in 1998, J. Geophys. Res., 108, 3202,
https://doi.org/10.1029/1999JC000139, 2003.
Augustyn, C., Lipinski, M., Sauer, Whh., Roberts, M., and Mitchell-Innes, B. A.:
Chokka squid on the Agulhas Bank: Life history and ecology, S. Afr. J. Sci..
90, 143–154, 1994.
Azam, F., Fenchel, T., Field, J. G., Gray, J., Meyer-Reil, L., and
Thingstad, F.: The ecological role of water-column microbes in the sea, Mar.
Ecol. Prog. Ser., 10, 257–263, https://doi.org/10.3354/meps010257, 1983.
Babu, M. T., Sarma, Y. V. B., Murty, V. S. N., and Vethamony, P.: On the
circulation in the Bay of Bengal during northern spring inter-monsoon
(March-April 1987), Deep-Sea Res. Pt. II, 5, 855–865,
https://doi.org/10.1016/S0967--0645(02)00609--4., 2003.
Bakun, A., Roy, C., and Lluch-Cota, S. E.: Coastal upwelling and other
processes regulating ecosystem productivity and fish production in the
western Indian Ocean, in: Large marine ecosystems of the Indian Ocean:
Assessment, sustainability, and management, edited by: Sherman, K., Okemwa, E. N.,
and Ntiba, M. J., 103–141, Blackwell Science Inc., 1998.
Banse, K.: On upwelling and bottom-trawling off the southwest coast of
India, J. Mar. Biol. Ass. India, 1, 33–49, 1959.
Banse, K.: Hydrography of the Arabian Sea Shelf of India and Pakistan and
effects on demersal fishes, Deep Sea Res.-Ocean., 15, 45–79,
https://doi.org/10.1016/0011-7471(68)90028-4, 1968.
Barlow, R., Lamont, M.-J., Gibberd, R., Airs, L., Jacobs, and Britz, K.:
Phytoplankton communities and acclimation in a cyclonic eddy in the
southwest Indian Ocean, Deep-Sea Res. Pt. I, 124, 18–30,
https://doi.org/10.1016/j.dsr.2017.03.013, 2017.
Baumgart, A., Jennerjahn, T., Mohtadi, M., and Hebbeln, D.: Distribution and
burial of organic carbon in sediments from the Indian Ocean upwelling region
off Java and Sumatra, Indonesia, Deep-Sea Res. Pt. I, 157, 458–467,
https://doi.org/10.1016/j.dsr.2009.12.002, 2010.
Beal, L. M., Chereskin, T. K., Lenn, Y. D., and Elipot, S.: The Sources and
Mixing Characteristics of the Agulhas Current, J. Phys. Oceanogr., 36,
2060–2074, https://doi.org/10.1175/JPO2964.1, 2006.
Beal, L. M., De Ruijter, W. P. M., Biastoch, A., Zahn, R., and
SCOR/WCRP/IAPSO Working Group 136: On the role of the Agulhas system in
ocean circulation and climate, Nature, 472, 429–436,
https://doi.org/10.1038/nature09983, 2011.
Beal, L. M. and Donohue, K. A.: The Great Whirl: Observations of its
seasonal development and interannual variability, J. Geophys. Res.-Oceans,
118, 1–13, https://doi.org/10.1029/2012JC008198, 2013.
Beal, L. M., Elipot, S., Houk, A., and Leber, G. M. : Capturing the
Transport Variability of a Western Boundary Jet: Results from the Agulhas
Current Time-Series Experiment (ACT), J. Phys. Oceanogr., 45,
1302–1324, https://doi.org/10.1175/JPO-D-14-0119.1, 2015.
Beckley, L. E., Muhling, B. A., and Gaughan, D. J.: Larval fishes off Western
Australia: influence of the Leeuwin Current, J. R. Soc. West. Aus., 92,
101–109, 2009.
Behara, A. and Vinayachandran, P. N.: An OGCM study of the impact of rain
and river water forcing on the Bay of Bengal, J. Geophys. Res., 121,
2425–2446, https://doi.org/10.1002/2015JC011325, 2016.
Behrenfeld, M. J., Westberry, T. K., Boss, E. S., O'Malley, R. T., Siegel, D. A., Wiggert, J. D., Franz, B. A., McClain, C. R., Feldman, G. C., Doney, S. C., Moore, J. K., Dall'Olmo, G., Milligan, A. J., Lima, I., and Mahowald, N.: Satellite-detected fluorescence reveals global physiology of ocean phytoplankton, Biogeosciences, 6, 779–794, https://doi.org/10.5194/bg-6-779-2009, 2009.
Bennett, B. A. : Aspects of the biology and life history of white steenbras
Lithognathus lithognathus in southern Africa, South Afr. J. Mar. Sci., 13, 83–96, https://doi.org/10.2989/025776193784287257, 1993.
Biastoch, A., Böning, C. W., Lutjeharms, J. R. E.: Agulhas Leakage
dynamics affects decadal variability in Atlantic overturning circulation,
Nature, 456, 489–492, https://doi.org/10.1038/nature07426, 2008.
Braby, L.: Dynamics, interactions and ecosystem implications of mesoscale
eddies formed in the southern region of Madagascar, MSc thesis, University
of Cape Town, South Africa, 54 pp, 2014.
Breitburg, D., Levin, L. A., Oschlies, A., Grégoire, M., Chavez, F. P.,
Conley, D. J., Garçon, V., Gilbert, D., Gutiérrez, D., Isensee, K.,
Jacinto, G. S., Limburg, K. E., Montes, I., Naqvi, S. W. A., Pitcher, G. C.,
Rabalais, N. N., Roman, M. R., Rose, K. A., Seibel, B. A., and Zhang, J.:
Declining oxygen in the global ocean and coastal waters, Science, 359, 6371,
https://doi.org/10.1126/science.aam7240, 2018.
Brinca, L., Rey, F., Silva, C., and Sætre, R.: A survey on the marine
fish resources of Mozambique. October–November 1980, Institute of Marine
Research, Bergen, Norway, 1981.
Brown, S. L., M. R. Landry, R. T. Barber, L. Campbell, D. L. Garrison, and
Gowing, M. M.: Picophytoplankton dynamics and production in the Arabian Sea
during the 1995 Southwest Monsoon, Deep-Sea Res. Pt. II, 46, 1745–1768,
https://doi.org/10.1016/S0967-0645(99)00042-9, 1999.
Bryden, H. L., Beal, L. M., and Duncan, L. M.: Structure and Transport of the
Agulhas Current and Its Temporal Variability, J. Oceanogr., 61, 479–492,
https://doi.org/10.1007/s10872-005-0057-8, 2005.
Buchanan, P. and Beckley, L. E.: Chaetognaths of the Leeuwin Current
system: oceanographic conditions drive epi-pelagic zoogeography in the
south-east Indian Ocean, Hydrobiologia, 763, 81–96,
https://doi.org/10.1007/s10750-015-2364-4, 2016.
Capet, X., Colas, F., McWilliams, J. C., Penven, P., and Marchesiello, P.:
Eddies in Eastern Boundary Subtropical Upwelling Systems, Ocean Modeling in
an Eddying Regime, Geophysical Monograph Se ries, 177, AGU, 131–147, https://doi.org/10.1029/177GM10, 2008.
Dilmahamod, A.: Links between the Seychelles-Chagos thermocline ridge and
large scale climate modes and primary productivity; and the annual cycle of
chlorophyll-a, University of Cape Town, 2014.
Capone, D. G., Subramaniam, A., Montoya, J. P., Voss, M., Humborg, C.,
Johansen, A. M., Siefert, R. L., and Carpenter, E. J.: An extensive bloom of
the N2-fixing cyanobacterium Trichodesmium erythraeum in the central Arabian Sea, Mar. Ecol.
Prog. Ser., 172, 281–292, https://doi.org/10.3354/meps172281, 1998.
Caputi, N., Fletcher, W., Pearce, A., and Chubb, C.: Effect of the Leeuwin
Current on the recruitment of fish and invertebrates along the Western
Australian coast, Mar. Freshw. Res., 47, 147–155, https://doi.org/10.1071/MF9960147,
1996.
Carr, M.-E. and Kearns, E. J.: Production regimes in four Boundary Current
Systems, Deep-Sea Res. Pt. II, 50,
3199–3221, https://doi.org/10.1016/j.dsr2.2003.07.015, 2003.
Chaigneau, A., Le Texier, M., Eldin, G., Grados, C., and Pizarro, O.:
Vertical structure of mesoscale eddies in the eastern South Pacific Ocean: A
composite analysis from altimetry and Argo profiling floats, J. Geophys.
Res., 116, C11025, https://doi.org/10.1029/2011JC007134, 2011.
Chakraborty, K., Valsala, V., Gupta, G. V. M., and Sarma, V. V. S. S.: Dominant
biological control over upwelling on pCO2 in sea east of Sri Lanka, J.
Geophys. Res., 123, 3250–3261, https://doi.org/10.1029/2018JG004446, 2018.
Chatterjee, A., Shankar, D., Shenoi, S. S. C., Reddy, G. V., Michael, G. S.,
Ravichandran, M., Gopalkrishana, V. V., Rama Rao, E. P., Udaya Bhaskar, T.
V. S., and Sanjeevan, V. N.: A new atlas of temperature and salinity for the
North Indian Ocean, J. Earth Syst. Sci., 121, 559–593,
https://doi.org/10.1007/s12040-012-0191-9, 2012.
Chatterjee, A., Shankar, D., McCreary, J. P., and Vinayachandran, P. N.:
Yanai waves in the western equatorial Indian Ocean, J. Geophys. Res.-Oceans, 118, 1556–1570, https://doi.org/0.1002/jgrc.20121, 2013.
Chatterjee, A., Shankar, D., McCreary, J. P., Vinayachandran, P. N., and
Mukherjee, A.: Dynamics of Andaman Sea circulation and its role in
connecting the equatorial Indian Ocean to the Bay of Bengal, J. Geophys.
Res., 122,1–19, https://doi.org/10.1002/2016JC012300, 2017.
Chatterjee, A., Kumar, B. P., Prakash, S., and Singh, P.: Annihilation of
the Somali upwelling system during summer monsoon, Sci. Rep, 9, 7598,
https://doi.org/10.1038/s41598-019-44099-1, 2019.
Chaudhuri, A., Shankar, D., Aparna, S. G., Amol, P., Fernando, V.,
Kankonkar, A., Michael, G. S., Satelkar, N. P., Khalap, S. T., Tari, A. P.,
Gaonkar, M. G., Ghatkar, S., and Khedekar, R. R.: Observed variability of
the West India Coastal Current on the continental slope from 2009–2018, J.
Earth Syst. Sci., 129, 57, https://doi.org/10.1007/s12040-019-1322-3, 2020.
Chavez, F. P. and Toggweiler, J. R.: Physical estimates of global new
production: The upwelling contribution, in: Upwelling in the ocean:
Modern processes and ancient records, edited by: Summerhayes, C. P., Emeis, K.-C.,
Angel, M. V., Smith, R. L., and Zeitzschel, B., New York, John Wiley and Sons,
313–320, 1995.
Chavez, F. P. and Messie, M.: A comparison of eastern boundary upwelling
ecosystems, Prog. Oceanogr., 83, 80–93, https://doi.org/10.1016/j.pocean.2009.07.032,
2009.
Checkley, D. M. and Barth, J. A.: Patterns and processes in the California
Current System, Prog. Oceanogr., 83, 49–64,
https://doi.org/10.1016/j.pocean.2009.07.028, 2009.
Chen, G., Wang, D., and Hou, Y.: The features and interannual variability
mechanism of mesoscale eddies in the Bay of Bengal, Cont. Shelf. Res., 47,
178–185, https://doi.org/10.1016/j.csr.2012.07.011, 2012.
Chen, G., Han, W., Shu, Y., Li, Y., Wang, D., and Xie, Q.: The role of
Equatorial Undercurrent in sustaining the Eastern Indian Ocean upwelling,
Geophys. Res. Lett., 43, 6444–6451, https://doi.org/10.1002/2016GL069433, 2016.
Cheng, X., Xie, S.-P., McCreary, J. P., Qi, Y., and Du, Y.: Intraseasonal
variability of sea surface height over the Bay of Bengal, J. Geophys. Res.,
118, 1–15, https://doi.org/10.1002/jgrc.20075, 2013.
Cheng, G., Han, W., Li, Y., and Wang, D.: Interannual variability of
equatorial eastern Indian Ocean upwelling: Local versus remote forcing, J.
Phys. Oceanogr., 46, 789–807, https://doi.org/10.1175/JPO-D-15-0117.1, 2016.
Clarke, A. J., and X. Liu.: Interannual sea level in the northern and
eastern Indian ocean, J. Phys. Oceanogr., 24, 1224–1235, https://doi.org/10.1017/1520-0485, 1994.
Collins, M.: Upwelling on the southeast Madagascan shelf: frequency, extent,
and driving mechanisms, MSc thesis, Nelson Mandela University, Port
Elizabeth, South Africa, 126 pp., 2020.
Cook, J., Cook, J. R., and Beaglehole, J. C.: The Journals of Captain Cook,
Penguin UK, 1999.
Cossa, O., Pous, S., Penven, P., Capet, X., and Reason, C. J. C.: Modelling
cyclonic eddies in the Delagoa Bight region, Cont. Shelf. Res., 119, 14–29,
https://doi.org/10.1016/j.csr.2016.03.006, 2016.
Cox, M. D.: A numerical study of Somali Current eddies. J. Phys. Oceanogr.,
9, 311–326,
1979.
Cresswell, G. R. and Golding, T.: Observations of a south-flowing current
in the southeastern Indian Ocean, Deep-Sea Res. Pt. II,
27, 449–466, https://doi.org/10.1016/0198-0149(80)90055-2, 1980.
Cresswell, G., Boland, F., Peterson, J., and Wells, G.: Continental shelf
currents near the Abrolhos Islands, Western Australia, Mar. Freshw. Res.,
40, 113–128, https://doi.org/10.1071/MF9890113, 1989.
Cresswell, G. and Peterson, J.: The Leeuwin Current south of Western
Australia, Mar. Freshw. Res., 44, 285–303, https://doi.org/10.1071/MF9930285, 1993.
Cutler, A. N. and Swallow, J. C.: Surface currents of the Indian Ocean (to
25S, 100E), Technical Report 187 (8 pp. and 36 charts). Brachnell:
Meteorological Office, UK Institute of Oceanographic Science, 1984.
Darwin, C.: Journal of Researches Into the Natural History and Geology of
the Countries Visited During the Voyage of HMS “Beagle” Round the World:
Under the Command of Capt. Fitz Roy, R.N, 5th ed., London: Ward, Lock and
co., 1889.
Das, U., Vinayachandran, P. N., and Behara, A.: Formation of the southern
Bay of Bengal cold pool, Clim. Dynam., 47, 2009–2023,
https://doi.org/10.1007/s00382-015-2947-9, 2018.
De Ruijter, W. P. M., Leeuwen, P., and Lutjeharms, J.: Generation and Evolution of
Natal Pulses: Solitary Meanders in the Agulhas Current, J. Phys.
Oceanography, 29, 3043–3055,
1999.
De Ruijter, W. P. M., Ridderinkhof, H., Lutjeharms, J. R. E., Schouten, M. W.,
and Veth, C.: Observations of the flow in the Mozambique Channel, Geophys.
Res. Lett., 29, 1502, https://doi.org/10.1029/2001GL013714, 2002.
de Vos, A., Pattiaratchi, C. B., and Wijeratne, E. M. S.: Surface circulation and upwelling patterns around Sri Lanka, Biogeosciences, 11, 5909–5930, https://doi.org/10.5194/bg-11-5909-2014, 2014.
Delman, A. S., Sprintall, J., McClean, J. L., and Talley, L. D.: Anomalous
Java cooling at the initiation of positive Indian Ocean Dipole events, J.
Geophys. Res.-Oceans, 121, 5805–5824, https://doi.org/10.1002/2016JC011635, 2016.
Delman, A. S., McClean, J. L., Sprintall, J., Talley, L. D., and Bryan, F.
O.: Process-specific contributions to anomalous Java mixed layer cooling
during positive IOD events, J. Geophys. Res.-Oceans, 123, 4153–4176,
doi:/10.1029/2017JC013749, 2018.
Deutsch, C., Sarmiento, J. L., Sigman, D. M., Gruber, N., and Dunne, J. P.:
Spatial coupling of nitrogen inputs and losses in the ocean, Nature,
445, 163–167, https://doi.org/10.1038/nature05392, 2007.
Dilmahamod, A.: Links between the Seychelles-Chagos thermocline ridge and
large scale climate modes and primary productivity; and the annual cycle of
chlorophyll-a, University of Cape Town, 2014.
Dilmahamod, A. F., Hermes, J. C., and Reason, C. J. C. : Chlorophyll-a
variability in the Seychelles–Chagos Thermocline Ridge: Analysis of a
coupled biophysical model, J. Mar. Syst., 154, 220–232,
https://doi.org/10.1016/j.jmarsys.2015.10.011, 2016.
Dilmahamod, A. F., Penven, P., Aguiar-González, B., Reason, C. J. C.,
and Hermes, J. C.: A new definition of the South-East Madagascar Bloom and
analysis of its variability, J. Geophys. Res.-Oceans, 124, 1717–1735,
https://doi.org/10.1029/2018JC014582, 2019.
DiMarco, S. F., Chapman, P., and Nowlin Jr., W. D.: Satellite observations of
upwelling on the continental shelf south of Madagascar, Geophys. Res. Lett.,
27, 3965–3968, https://doi.org/10.1016/j.dsr2.2013.10.021, 2000.
Domingues, C. M., Maltrud, M. E., Wijffels, S. E., Church, J. A., and
Tomczak, M.: Simulated Lagrangian pathways between the Leeuwin Current
System and the upper-ocean circulation of the southeast Indian Ocean, Deep-Sea Res. Pt. II, 54, 797–817,
https://doi.org/10.1016/j.dsr2.2006.10.003, 2007.
Dong, C., McWilliams, J., Liu, Y., and Chen, D.: Global heat and salt
transports by eddy movement, Nat Commun., 5, 3294, https://doi.org/10.1038/ncomms4294,
2014.
Donners, J. and Drijfhout, S. S.: The Lagrangian view of South Atlantic
interocean exchange in a global ocean model compared with inverse model
results, J. Phys. Oceanogr., 34, 1019–1035,
2004.
Du, Y., Qu, T., Meyers, G., Masumoto, Y., and Sasaki, H.: Seasonal heat
budget in the mixed layer of the southeastern tropical Indian Ocean in a
high-resolution ocean general circulation model, J. Geophys. Res., 110,
C04012, https://doi.org/10.1029/2004JC002845, 2005.
Du, Y., Qu, T., Meyers, and Meyers, G.: Interannual variability of sea
surface temperature off Java and Sumatra in a global GCM, J. Climate, 21,
2451–2465, https://doi.org/10.1175/2007JCLI1753.1, 2008.
Dufois, F., Hardman-Mountford, N. J., Greenwood, J., Richardson, A. J.,
Feng, M., Herbette, S., and Matear, R.: Impact of eddies on surface
chlorophyll in the South Indian Ocean, J. Geophys. Res.-Oceans, 119,
8061–8077, https://doi.org/10.1002/2014jc010164, 2014.
Düing, W., Molinari, R., and Swallow, J.: Somali Current: Evolution of
surface flow, Science, 209, 588–590, https://doi.org/10.1126/science.209.4456.588-a,
1980.
Durand, F., Shankar, D., Birol, F., and Shenoi, S. S. C.: Spatiotemporal
structure of the East India Coastal Current from satellite altimetry, J.
Geophys. Res., 114, CO2013, https://doi.org/10.1029/2008JC004807, 2009.
Ehlert, C., Frank, M., Haley, B. A., Böniger, U., De Deckker, P., and
Gingele, F. X.: Current transport versus continental inputs in the eastern
Indian Ocean: Radiogenic isotope signatures of clay size sediments, Geochem.
Geophys. Geosyst., 12, Q06017, https://doi.org/10.1029/2011GC003544, 2011.
Ekman, V. W.: On the influence of the Earth's rotation on ocean currents,
Arch. Math. Astron. Phys., 2, 1–52, 1905.
Elipot, S. and Beal, L. M.: Characteristics, Energetics, and Origins of
Agulhas Current Meanders and their Limited Influence on Ring Shedding, J.
Phys. Oceanogr., 45, 2294–2314, https://doi.org/10.1175/JPO-D-14-0254.1, 2015.
Falkowski, P., Ziemann, D., Kolber, Z., and Beinfang, P. K.: Role of eddy
pumping in enhancing primary production in the ocean, Nature, 352, 55–58,
https://doi.org/10.1038/352055a0, 1991.
Feng, M., Meyers, G., Pearce, A., and Wijffels, S.: Annual and interannual
variations of the Leeuwin Current at 32∘ S, J. Geophys. Res.
Oceans, 108, C11, 3355, https://doi.org/10.1029/2002jc001763, 2003.
Feng, M., Majewski, L. J., Fandry, C. B., and Waite, A. M: Characteristics
of two counter-rotating eddies in the Leeuwin Current system off the Western
Australian coast, Deep-Sea Res. Pt. II, 54,
961–980, https://doi.org/10.1016/j.dsr2.2006.11.022, 2007.
Feng, M., Waite, A., and Thompson, P.: Climate variability and ocean
production in the Leeuwin Current system off the west coast of Western
Australia, J. R. Soc. West. Aus., 92, 67–82, 2009.
Feng, M., Slawinski, D., Beckley, L. E., and Keesing, J. K.: Retention and
dispersal of shelf waters influenced by interactions of ocean boundary
current and coastal geography, Mar. Freshw. Res., 61, 1259–1267,
https://doi.org/10.1071/MF09275, 2010.
Findlater, J.: A major low-level air current near the Indian Ocean during
the northern summer, Q. J. R. Meteorol. Soc., 95, 362–380,
https://doi.org/10.1002/qj.49709540409, 1969.
Fischer, J., F. Schott, and Stramma, L.: Currents and transports of the
Great Whirl-Socotra Gyre system during the summer monsoon, August 1993, J.
Geophys. Res., 101, 3573–3587, https://doi.org/10.1029/95JC03617, 1996.
Fletcher, W., Tregonning, R., and Sant, G.: Interseasonal variation in the
transport of pilchard eggs and larvae off southern Western Australia, Mar.
Ecol. Prog. Ser., 111, 209–224, https://doi.org/10.3354/meps111209, 1994.
Foltz, G. R., Vialard, J., Praveen Kumar, B., and McPhaden, M. J.: Seasonal
Mixed Layer Heat Balance of the Southwestern Tropical Indian Ocean, J. Climate,
23, 947–965., https://doi.org/10.1175/2009JCLI3268.1, 2010.
Fonteneau, A., Lucas, V., Tew Kai, E., Delgado, A., and Demarcq, H.:
Mesoscale exploitation of a major tuna concentration in the Indian Ocean,
Aquatic Living Resources, 21, 109-121, https://doi.org/10.1051/alr:2008028, 2008.
Francis, P. A., Jithin, A. K., Chatterjee, A., Mukherjee, A., Shankar, D.,
Vinayachandran, P. N., and Ramakrishna, S. S. V. S.: Structure and dynamics
of undercurrents in the western boundary current of the Bay of Bengal, Ocean
Dyn., 70, 387–404, https://doi.org/10.1007/s10236-019-01340-9, 2020.
Furnas, M.: Intra-seasonal and inter-annual variations in phytoplankton
biomass, primary production and bacterial production at North West Cape,
Western Australia: Links to the 1997–1998 El Niño event, Cont Shelf
Res., 27, 958–980, https://doi.org/10.1016/j.csr.2007.01.002, 2007.
Fye, P. M.: The International Indian Ocean Expedition, The Distinguished
Lecture Series 1964-1965, sponsored by Science Bureau, Washington Board of
Trade, presented at Georgetown University, 27 January 1965,
https://doi.org/10.1575/1912/5872, 1965.
Gadgil, S., Vinayachandran, P. N., Francis, P. A., and Gadgil, S.: Extremes
of the Indian summer monsoon rainfall, ENSO and equatorial Indian Ocean
oscillation, Geophys. Res. Lett., 31, L12213,
https://doi.org/10.1029/2004GL019733, 2004.
Gandhi, N., Singh, A., Prakash, S., Ramesh, R., Raman, M., Sheshshayee, M.,
and Shetye, S.: First direct measurements of N2 fixation during a
Trichodesmium bloom in the eastern Arabian Sea, Glob. Biogeochem. Cycles,
25, GB4014, https://doi.org/10.1029/2010GB003970, 2011.
Gao, C., Fu, M., Song, H., Wang, L., Wei, Q., Sun, P., Liu, L., and Zhang,
X.: Phytoplankton pigment pattern in the subsurface chlorophyll maximum in
the South Java coastal upwelling system, Indonesia, Acta Oceanol. Sin., 37,
97–106, https://doi.org/10.1007/s13131-018-1342-x, 2018.
Garçon, V., B. Dewitte, I. Montes, and K. Goubanova, Land-sea-atmosphere
interactions exacerbating ocean deoxygenation in Eastern Boundary Upwelling
Systems (EBUS), In IUCN Report Ocean Deoxygenation: Everyone's Problem., available at: https://portals.iucn.org/library/sites/library/files/documents/03.420DEOX.pdf (last access: on 5 November 2021), 2019.
Gaughan, D., Fletcher, W., and White, K.: Growth rate of larval Sardinops sagax from
ecosystems with different levels of productivity, Mar. Biol, 139,
831–837, https://doi.org/10.1007/s002270100637, 2001a.
Gaughan, D., White, K., and Fletcher, W.: The links between functionally
distinct adult assemblages of Sardinops sagax: larval advection across management
boundaries, ICES J. Mar. Sci., 58, 597–606, https://doi.org/10.1006/jmsc.2001.1061,
2001b.
Gauns, M., Madhupratap, M., Ramaiah, N., Jyothibabu, R., Fernandes, V.,
Paul, J. T., and Prasanna Kumar, S.: Comparative accounts of biological
productivity characteristics and estimates of carbon fluxes in the Arabian
Sea and the Bay of Bengal, Deep-Sea Res. Pt. II,
52, 2003-2017, https://doi.org/10.1016/j.dsr2.2005.05.009, 2005.
Guastella, L. A.and Roberts, M. J.: Dynamics and role of the Durban cyclonic
eddy in the KwaZulu-Natal Bight ecosystem, African Journal of Marine
Science, 38, 23–42, https://doi.org/10.2989/1814232X.2016.1159982,
2006.
Gentilli, J.: Thermal anomalies in the eastern Indian Ocean, Nat. Phys.
Sci., 238, 93–95, https://doi.org/10.1038/physci238093a0, 1972.
George, J. V., Nuncio, M, Racheal, C., Anilkumar, N., Sharon, B. N.,
Shramik, M. P., Sini P., Denny, P. A., Krishnan, K. P., and Achuthankutty,
C. T.: Role of physical processes in chlorophyll distribution in the western
tropical Indian Ocean, J. Mar. Syst., 113–114, 2013.
George, J. V., Vinayachandran, P. N., Vijith, V., Thushara, V., Nayak, A.
A., Pargaonkar, S. M., Amol, P., Vijaykumar, K., and Matthews, A. J.:
Mechanisms of Barrier Layer Formation and Erosion from In Situ Observations
in the Bay of Bengal, J. Phys. Oceanogr., 49, 1183–1200, https://doi.org/10.1175/JPO-D-18-0204.1, 2019.
Gersbach, G. H., Pattiaratchi, C. B., Ivey, G. N., and Cresswell, G. R.:
Upwelling on the south-west coast of Australia – source of the Capes
Current?, Cont Shelf Res., 19, 363–400,
https://doi.org/10.1016/S0278-4343(98)00088-0, 1999.
Godfrey, J. and Ridgway, K.: The large-scale environment of the
poleward-flowing Leeuwin Current, Western Australia: longshore steric height
gradients, wind stresses and geostrophic flow, J. Phys. Oceanogr., 15,
481–495, 1985.
Goes, J. I., Thoppil, P. G., Gomes, H. D., and Fasullo, J. T.: Warming of the
Eurasian landmass is making the Arabian Sea more productive, Science, 308,
545–547, 2005.
Goes, J. I., Tian, H., Gomes, H. D. R., Anderson, O. R., Al-Hashmi, K.,
deRada, S., Luo, H., Al-Kharusi, L., Al-Azri, A., and Martinson, D. G.:
Ecosystem state change in the Arabian Sea fuelled by the recent loss of snow
over the Himalayan-Tibetan Plateau region, Sci. Rep., 10, 7422, https://doi.org/10.1038/s41598-020-64360-2, 2020.
Gomes, H.D.R., Goes, J. I., and Saino, T.: Influence of physical processes
and freshwater discharge on the seasonality of phytoplankton regime in the
Bay of Bengal, Cont. Shelf Res., 20, 313–330, https://doi.org/10.1016/S0278-4343(99)00072-2, 2000.
Gomes, H.D.R., Goes, J. I., Matondkar, S. P., Parab, S. G., Al-Azri, A. R.,
and Thoppil, P. G.: Blooms of Noctiluca miliaris in the Arabian Sea – An in situ and satellite
study, Deep-Sea Res. Pt. I, 55, 751–765,
https://doi.org/10.1016/j.dsr.2008.03.003, 2008.
Gomes, H. D. R., Goes, J. I., Matondkar, S. P., Buskey, E. J., Basu, S.,
Parab, S., and Thoppil, P.: Massive outbreaks of Noctiluca scintillans blooms in the Arabian Sea
due to spread of hypoxia, Nat. Commun., 5, 4862, https://doi.org/10.1038/ncomms5862,
2014.
Gopalakrishna, V. V. and Sastry, J. S.: Hydrography of the western Bay of
Bengal during SW monsoon, Indian J. Mar. Sci., 14, 62–65, 1984.
Goschen, W. S., Bornman, T. G., Deyzel, S., and Schumann, E. H.: Coastal
upwelling on the far eastern Agulhas Bank associated with large meanders in
the Agulhas Current, Cont. Shelf Res., 101, 34–46, 2015.
Govender, A. and Rabede P. V.: Status report: seventy four (Polysteganus undulosus), in: Status
Reports for Key Linefish Species, edited by: Mann, B. Q., Spec. Publ. oceanogr.
Res. Inst. S. Afr. 7, 174–175, 2000.
Griffin, D. A., Wilkin, J. L., Chubb, C. F., Pearce, A. F., and Caputi, N.:
Ocean currents and the larval phase of Australian western rock lobster,
Panulirus cygnus, Mar. Freshw. Res., 52, 1187–1199, https://doi.org/10.1071/MF01181,
2001.
Griffiths, M. H. and Hecht,T.: On the life-history of Atractoscion aequidens, a migratory sciaenid
off the east coast of southern Africa, J. Fish Bioi., 47, 962–985, 1995.
Griffiths, C. L., Robinson, T. B., Lange, L., and Mead, A.: Marine
biodiversity in South Africa: an evaluation of current states of knowledge,
Plos One, 5, e12008, https://doi.org/10.1371/journal.pone.0012008, 2010.
Grumet, N. S., Abram,N. J., Beck, J. W., Dunbar,R. B., Gagan, M. K.,
Guilderson, T. P., Hantoro, W. S., and Suwargadi, B. W.: Coral radiocarbon
records of Indian Ocean water mass mixing and wind-induced upwelling along
the coast of Sumatra, Indonesia, J. Geophys. Res., 109, C05003,
https://doi.org/10.1029/2003JC002087, 2004.
Guastella, L. A. and Roberts, M. J.: Dynamics and role of the Durban cyclonic
eddy in the KwaZulu-Natal Bight ecosystem, Afr. J. Mar. Sci., 38,
23–42, https://doi.org/10.2989/1814232X.2016.1159982, 2016.
Gupta, G. V. M., Sudheesh, V., Sudharma, K., Saravanane, N., Dhanya, V.,
Dhanya, K., Lakshmi, G., Sudhakar, M., and Naqvi, S.: Evolution to decay of
upwelling and associated biogeochemistry over the southeastern Arabian Sea
shelf, J. Geophys. Res.-Biogeo., 121, 159–175, https://doi.org/10.1002/2015JG003163, 2016.
Gupta, G. V. M., Jyothibabu, R., Ramu, Ch. V., Yudhistir Reddy, A.,
Balachandran, K. K., Sudheesh, V., Sanjeev Kumar, Chari, N. V. H. K., Kausar F.
B., Prachi H. M., Reddy, B., and Vijayan, A. K.: The world's largest coastal
deoxygenation zone is not anthropogenically driven, Environ. Res. Lett., 16, 054009, https://doi.org/10.1088/1748-9326/abe9eb, 2021.
Halm, H., Lam, P., Ferdelman, T.G., Lavik, G., Dittmar, T., Laroche, J.,
D'Hondt, S., and Kuypers, M. M.: Heterotrophic organisms dominate nitrogen
fixation in the South Pacific Gyre, ISME J., 6, 1238–1249,
https://doi.org/10.1038/ismej.2011.182, 2012.
Halo, I., Backeberg, B., Penven, P., Ansorge, I., Reason, C., and Ullgren,
J. E.: Eddy properties in the Mozambique Channel: A comparison between
observations and two numerical ocean circulation models, Deep-Sea Res. Pt. II,
100, 38–53, https://doi.org/10.1016/j.dsr2.2013.10.015, 2014.
Halo, I., Sagero, P., Manyilizu, M., and Shigalla, M.: Biophysical modelling
of the coastal upwelling variability and circulation along the Tanzanian and
Kenyan coasts. WIO, J. Mar. Sci., 1, 43–61,
https://doi.org/10.4314/wiojms.si2020.1.5, 2020.
Hanson, C. E., Pattiaratchi, C. B., and Waite, A. M.: Seasonal production
regimes off south-western Australia: influence of the Capes and Leeuwin
Currents on phytoplankton dynamics, Mar. Freshw. Res., 56, 1011–1026,
https://doi.org/10.1071/MF04288, 2005.
Hanson, C. E., Pesant, S., Waite, A. M., and Pattiaratchi, C. B.: Assessing
the magnitude and significance of deep chlorophyll maxima of the coastal
eastern Indian Ocean, Deep-Sea Res. Pt. II, 54,
884–901, https://doi.org/10.1016/j.dsr2.2006.08.021, 2007a.
Hanson, C. E., Waite, A. M., Thompson, P. A., and Pattiaratchi, C. B.:
Phytoplankton community structure and nitrogen nutrition in Leeuwin Current
and coastal waters off the Gascoyne region of Western Australia, Deep-Sea Res. Pt. II, 54, 902–924,
https://doi.org/10.1016/j.dsr2.2006.10.002, 2007b.
Hanson, C. and McKinnon, A.: Pelagic ecology of the Ningaloo region,
Western Australia: influence of the Leeuwin Current, J. R. Soc. West Aus., 92,
129–138, 2009.
Harris, T. F. W., and van Foreest, D.: The Agulhas Current in March
1969, Deep Sea Res., 25, 549–550,
https://doi.org/10.1016/0146-6291(78)90643-4, 1978.
Haugen, V. E., Johannessen, O. M., and Evensen, G.: Mesoscale modeling study
of the oceanographic conditions off the southwest coast of India, J. Earth
Syst. Sci., 111, 321–337, https://doi.org/10.1007/BF02701978, 2002.
Heileman, S. and Scott, L. E. P.: The Somali coastal current large marine
ecosystem, in: The UNEP Large Marine
Ecosystem Report: A perspective on changing conditions in LMEs of the
World's regional seas, edited by: Sherman, K. and Hempel, G., UNEP, United States, 2008.
Heip, C. H. R., Hemminga, M. A., and de Bie, M. J. M.: Monsoons and Coastal
Ecosystems in Kenya, Cruise reports Netherlands Indian Ocean Programme, 5,
National Museum of Natural History, Leiden, Netherlands, 122 pp, 1995.
Helly, J. J. and Levi, L. A.: Global distribution of naturally occurring
marine hypoxia on continental margins, Deep-Sea Res. Pt. II, 51, 1159–1168, 2004.
Hermes, J. C. and Reason, C. J. C. : Annual cycle of the South Indian
Ocean (Seychelles-Chagos) thermocline ridge in a regional ocean model, J.
Geophys. Res., 113, C04035, https://doi.org/10.1029/2007JC004363, 2008.
Hitchcock, G. L. and Olson, D.: NE and SW monsoon conditions along the
Somali coast during 1987, edited by: Desai, B. N., Oceanography of the Indian
Ocean, New Delhi: Oxford and IBH, 1992.
Hitchcock, G. L., Key, E., and Masters, J.: The fate of upwelled waters in
the Great Whirl, August 1995, Deep-Sea Res. Pt. II, 47, 1605–1621, 2000.
Ho, C.-R., Zheng, Q., and Kuo, N.-J.: SeaWiFs observations of upwelling
south of Madagascar: long-term variability and interaction with East
Madagascar Current, Deep-Sea Res. Pt. II, 51, 59–67,
https://doi.org/10.1016/j.dsr2.2003.05.001, 2004.
Holliday, D., Beckley, L. E., and Olivar, M. P.: Incorporation of larval
fishes into a developing anti-cyclonic eddy of the Leeuwin Current off
south-western Australia, J. Plankton Res., 33, 1696–1708,
https://doi.org/10.1093/plankt/fbr064, 2011.
Holliday, D., Beckley, L. E., Millar, N., Olivar, M. P., Slawinski, D.,
Feng, M., and Thompson, P. A.: Larval fish assemblages and particle
back-tracking define latitudinal and cross-shelf variability in an eastern
Indian Ocean boundary current, Mar. Ecol. Prog. Ser., 460, 127–144,
https://doi.org/10.3354/meps09730, 2012.
Holloway, P. E. and Nye, H.: Leeuwin Current and wind distributions on the
southern part of the Australian North West Shelf between January 1982 and
July 1983, Aust. J. Mar. Freshw. Res., 36, 123–137,
https://doi.org/10.1071/MF9850123, 1985.
Hood, R. R., Bange, H. W., Beal, L., Beckley, L. E., Burkill, P., Cowie, G.L.,
D'Adamo, N., Ganssen, G., Hendon, H., Hermes, J., Honda, M., McPhaden, M.,
Roberts, M., Singh, S., Urban, E., and Yu, W.: Science Plan of the Second
International Indian Ocean Expedition (IIOE-2): A Basin-Wide Research
Program, Scientific Committee on Oceanic Research, Newark, Delaware, USA,
2015.
Hood, R. R., Beckley, L. E., and Wiggert, J. D.: Biogeochemical and
ecological impacts of boundary currents in the Indian Ocean, Prog.
Oceanogr., 156, 290–325, https://doi.org/10.1016/j.pocean.2017.04.011, 2017.
Horii, T., Hase, H., Ueki, I., and Masumoto, Y.: Oceanic precondition and
evolution of the 2006 Indian Ocean dipole, Geophys. Res. Lett., 35, L03607,
https://doi.org/10.1029/2007GL032464, 2008.
Horii, T., Ueki, I., Syamsudin, F., Sofian, I., and Ando, K.: Intraseasonal
coastal upwelling signal along the southern coast of Java observed using
Indonesian tidal station data, J. Geophys. Res., 121, 2690–2708, https://doi.org/10.1002/2015JC010886, 2016.
Horii, T., Ueki, I., and Ando, K.: Coastal upwelling events along the
southern coast of Java during the 2008 positive Indian Ocean Dipole, J.
Oceanogr., 74, 499–508, https://doi.org/10.1007/s10872-018-0475-z, 2018.
Huggett, J. A.: Mesoscale distribution and community composition of
zooplankton in the Mozambique Channel, Deep-Sea Res. Pt. II, 100, 119–135, https://doi.org/10.1016/j.dsr2.2013.10.021, 2014.
Hutchings, L. Beckley, L. L. E., Griffiths, M. H., Roberts, M. J., Sundby,
S., van der Lingen, C.: Spawning on the edge: spawning grounds and nursery
areas around the southern African coastline, Mar. Freshw. Res. 53, 307–318,
https://doi.org/10.1071/MF01147, 2002.
Hutchings, L., van der Lingen, C., Shannon, L., Crawford, R., Verheye, H.,
Bartholomae, C., van der Plas, A., Louw, D., Kreiner, A., Ostrowski, M.,
Fidel, Q., Barlow, R., Lamont, T., Coetzee, J., Shillington, F., Veitch, J.,
Currie, J., and Monteiro, P.: The Benguela Current: An ecosystem of four
components, Prog. Oceanogr., 83, 15–32, https://doi.org/10.1016/j.pocean.2009.07.046,
2009.
IMR: Cruise Report No. 1 of R/V Dr Fridtjof Nansen, Joint
NORAD/Mozambique/FAO Project to investigate the fish resources off the coast
of Mozambique, Institute of Marine Research, Bergen, Norway, 1977.
IMR: Cruise Report No. 2 of R/V Dr Fridtjof Nansen, Joint
NORAD/Mozambique/FAO Project to investigate the fish resources off the coast
of Mozambique, October–December 1977, Institute of Marine Research, Bergen,
Norway, 1978a.
IMR: Cruise Report No. 3 of R/V Dr Fridtjof Nansen. Joint
NORAD/Mozambique/FAO Project to investigate the fish resources off the coast
of Mozambique, January–March 1978, Institute of Marine Research, Bergen,
Norway, 1978b.
IMR: Cruise Report No. 4 of R/V Dr Fridtjof Nansen, Joint
NORAD/Mozambique/FAO Project to investigate the fish resources off the coast
of Mozambique, April–June 1978, Institute of Marine Research, Bergen,
Norway, 1978c.
IMR: Fisheries resources survey, Madagascar. Cruise Report R/V Dr Fridtjof
Nansen, 16–28 June 1983, Institute of Marine Research, Bergen, Norway,
1983.
Iskandar, I., Tozuka, T., Sasaki, H., Masumoto, Y., and Yamagata, T.:
Intraseasonal variations of surface and subsurface currents off Java as
simulated in a high-resolution ocean general circulation model, J. Geophys.
Res., 111, C12015, https://doi.org/10.1029/2006JC003486, 2006.
Iskandar, I., Rao, S. A., and Tozuka, T.: Chlorophyll−a bloom along the
southern coasts of Java and Sumatra during 2006, Int. J. Remote Sens., 30,
663–671, https://doi.org/10.1080/01431160802372309, 2009.
Iskandar, I., Sari, Q. W, Setiabudidaya, D., Yustian, I., and Monger, B.: The
distribution and variability of chlorophyll-a bloom in the southeastern
tropical Indian Ocean using Empirical Orthogonal Function analysis,
Biodiversitas, 18, 1546–1555, https://doi.org/10.13057/biodiv/d180433, 2017.
Izumo, T., Montegut, C. D., Luo, J. J., Behera, S. K., Masson, S., and
Yamagata, T.: The role of the western Arabian Sea upwelling in Indian
monsoon rainfall variability, J. Climate, 21, 5603–5623,
https://doi.org/10.1175/2008JCLI2158.1, 2008.
Jackson, J. M., Rainville, L., Roberts, M. J., McQuaid, C. D., and
Lutjeharms, J. R. E.: Mesoscale bio-physical interactions between the
Agulhas Current and the Agulhas Bank, South Africa, Cont. Shelf Res., 49,
10–24, https://doi.org/10.1016/ j.csr.2012.09.005, 2012.
Jacobs, Z. L., Jebri, F., Raitsos, D. E., Popova, E., Srokosz, M., Painter,
S. C., Nencioli, F., Roberts, M., Kamau, J., Palmer, M., and Wihsgott, J.:
Shelf-break upwelling and productivity over the North Kenya Banks: The
importance of large-scale ocean dynamics, J. Geophys. Res.-Oceans, 125,
e2019JC015519, https://doi.org/10.1029/2019JC015519, 2020.
Jochum, J. and Murtugudde, R.: Internal variability of Indian Ocean SST, J.
Climate, 18, 3726–3738, https://doi.org/10.1175/JCLI3488.1, 2005.
Johannes, R., Pearce, A., Wiebe, W., Crossland, C., Rimmer, D., Smith, D.,
and Manning, C.: Nutrient characteristics of well-mixed coastal waters off
Perth, Western Australia, Estuar. Coast. Shelf Sci., 39, 273–285,
https://doi.org/10.1006/ecss.1994.1064, 1994.
Johannessen, O. M., Subbaraju, G. V., and Blindheim, J.: Seasonal variations
of the oceanographic conditions off the southwest coast of India during
1971-1975, Fisk Dir Skr Ser Hav Unders, 18, 247–261, 1981.
Johnsen, E., Krakstad, J., Ostrowski, M., Serigstad, B., Strømme, T.,
Alvheim, O., Olsen, M., Zaera, D., André, E., Dias, N., Sousa, L.,
Sousa, B., Malauene, B., and Abdula, S.: Surveys of the living marine
resources of Mozambique: Ecosystem survey and special studies, 27
September–21 December 2007, Report No. 8/2007–2007409, Institute of Marine
Research, Bergen, Norway, 2007.
Jorge da Silva, A., Mubango, A., and Sætre, R.: Information on
oceanographic cruises in the Mozambique Channel, Revista de
Investigação Pesquira, 2, Instituto de Desenvolvimento Pesqueiro,
Maputo, República Popular de Moçambique, 89, 1981.
Jyothibabu, R., Vinayachandran, P. N., Madhu, N. V., Robin, R. S., Karnan,
C., Jagadeesan, L., and Anjusha, A.: Phytoplankton size structure in the
southern Bay of Bengal modified by the Summer Monsoon Current and associated
eddies: Implications on the vertical biogenic flux, J. Mar. Syst., 143,
98–119, https://doi.org/10.1016/j.jmarsys.2014.10.018, 2015.
Kampf, J. and Chapman, P: Upwelling Systems of the World,
https://doi.org/10.1007/978-3-319-42524-5, 2016.
Kämpf, J. and Kavi, A.: SST variability in the eastern intertropical
Indian Ocean – On the search for trigger mechanisms of IOD events, Deep-Sea Res. Pt. II, 166, 64–74,
https://doi.org/10.1016/j.dsr2.2018.11.010, 2019.
Kanuri, V. V., Rao, G. D., Munnooru, K., Sura, A., Patra, S., Vinjamuri, R. R.,
and Karr, R.: Scales and drivers of seasonal pCO2 dynamics and net
ecosystem exchange along the coastal waters of southeastern Arabian Sea,
Marine Poll. Bull., 121, 372–380, 2017.
Kawamiya, M.: Mechanism of offshore nutrient supply in the western Arabian
Sea, J. Mar. Res., 59, 675–696, https://doi.org/10.1357/002224001762674890,
2001.
Keen, T. R., Kindle, J. C., and Young, D. K.: The interaction of southwest
monsoon upwelling, advection and primary production in the northwest Arabian
Sea, J. Mar. Syst., 13, 61–82,
https://doi.org/10.1016/S0924-7963(97)00003-1, 1997.
Kindle, J. C., Arnone, R., and Smedstad, O. M.: On the generation of coastal
filaments during the Spring Intermonsoon, EOS, Transactions of the AGU, 83,
37, 2002.
Kolasinski, J., Kaehler, S., and Jaquemet, S.: Distribution and sources of
particulate organic matter in a mesoscale eddy dipole in the Mozambique
Channel (south-western Indian Ocean): Insight from C and N stable isotopes,
J. Mar. Syst., 96, 122–131, https://doi.org/10.1016/j.jmarsys.2012.02.015, 2012.
Koné, V., Aumont, O., Lévy, and M., Resplandy, L.: Physical and
biogeochemical controls of the phytoplankton seasonal cycle in the Indian
Ocean: a modeling study, In: Indian Ocean Biogeochemical Processes and
Ecological Variability, AGU, 147–166, doi.org/10.1029/2008GM000700, 2009.
Koné, V., Lett, C., and Fréon, P.,: Modelling the effect of food
availability on recruitment success of Cape anchovy ichthyoplankton in the
southern Benguela upwelling system, Afr. J. Mar. Sci., 35, 151–161,
2013.
Koslow, J. A., Pesant, S., Feng, M., Pearce, A., Fearns, P., Moore, T.,
Matear, R., and Waite, A.: The effect of the Leeuwin Current on
phytoplankton biomass and production off Southwestern Australia, J. Geophys.
Res.-Oceans, 113, C07050, https://doi.org/10.1029/2007JC004102, 2008.
Krakstad, J.-O., Mehl, S., Roman, R., Escobar-Porras, J., Stapley, J.,
Flynn, B., Olsen, M., and Beck, I.: Cruise Reports Dr Fridtjof Nansen, East
Madagascar Current Ecosystem Survey ASCLME/FAO 2008 Cruise 1, 24 August–1
October 2008, Institute of Marine Research, Bergen, Norway, 2008.
Kromkamp, J., de Bie, M., Goosen, N., Peene, J., van Rijswijk, P., Sinke,
J., and Duineveld, G. C. A.: Primary production by phytoplankton along the
Kenyan coast during the SE monsoon and November intermonsoon 1992, and the
occurrence of Trichodesmium, Deep-Sea Res. Pt. II, 44,
1195–1212, https://doi.org/10.1016/S0967-0645(97)00015-5, 1997.
Krug, M. and Tournadre, J.: Satellite observations of an annual cycle in
the Agulhas Current, Geophys. Res. Lett., 39, L15607,
https://doi.org/10.1029/2012GL052335, 2012.
Krug, M., Tournadre, J., and Dufois, F.: Interactions between the Agulhas
Current and the eastern margin of the Agulhas Bank, Cont. Shelf Res., 81,
67–79, https://doi.org/10.1016/j.csr.2014.02.020, 2014.
Krug, M., Swart, S., and Gula, J.: Submesoscale cyclones in the Agulhas
current, Geophys. Res. Lett., 44, 346–354,
https://doi.org/10.1002/2016GL071006, 2017.
Kumar, S., Ramesh, R., Sardesai, S., and Sheshshayee, M. S.: High new production
in the Bay of Bengal: possible causes and implications, Geophys. Res. Lett.
31, L18304, https://doi.org/10.1029/2004GL021005, 2004.
Kumar, P. K., Singh, A., Ramesh, R., and Nallathambi, T.: N2 Fixation in
the Eastern Arabian Sea: Probable Role of Heterotrophic Diazotrophs, Mar.
Chem., 4, 80, https://doi.org/10.3389/fmars.2017.00080, 2017.
Kurian, J. and Vinayachandran, P. N.: Mechanisms of formation of the
Arabian Sea mini warm pool in a high-resolution Ocean General Circulation
Model, J. Geophys. Res.-Oceans, 112, C05009, https://doi.org/10.1029/2006JC003631, 2007.
Kyewalyanga, M. S., Naik, R., Hegde, S., Raman, M., Barlow, R., and Roberts,
M.: Phytoplankton biomass and primary production in Delagoa Bight
Mozambique: Application of remote sensing, Estuar. Coast. Shelf Sci., 74,
429–436, https://doi.org/10.1016/j.ecss.2007.04.027, 2007.
Levy, M., Andre., J.-M., Shankar, D.,
Durand, F., and Shenoi, S. S. C.: A quantitative method for describing the
seasonal cycles of surface chlorophyll in the Indian Ocean, SPIE
proceedings, Remote Sens. Mar. Environ., edited by: Frouin, R. J., Agarwal, V. K., Kawamura, H., Nayak, S., and Pan D., 6406, 640611, 8 pp, 2006.
La Fond, E. C.: On upwelling and sinking off the east coast of India, Andhra
Univ. Mem. Oceanogr., 1, 117–121, 1954.
La Fond, E. C.: Oceanographic studies in the Bay of Bengal, Proc. Indian
Acad. Sci., 46, 1–46, https://doi.org/10.1007/BF03052445, 1957.
La Fond, E. C.: On the circulation of the surface layers on the east coast
of India, Andhra Univ. Mem. Oceanogr., 2, 1–11, 1958.
La Fond, E. C: Sea surface features and internal waves in the sea, Indian J.
Meterol. Geophys., 10, 415–419, 1959.
Lakshmi, R. S., Chatterjee, A., Prakash, S., and Mathew, T.: Biophysical
Interactions in Driving the Summer Monsoon Chlorophyll Bloom Off the Somalia
Coast, J. Geophys. Res.-Oceans, 125, e2019JC015549, https://doi.org/10.1029/2019JC015549,
2020.
Lamont, T., Roberts, M. J., Barlow, R. G., Morris, T., and van den Berg, M.
A.: Circulation patterns in the Delagoa Bight, Mozambique, and the influence
of deep ocean eddies, Afr. J. Mar. Sci., 32, 553–562, https://doi.org/10.2989/1814232X.2010.538147, 2010.
Lamont, T., Barlow, R., Morris, T., and van den Berg, M.: Characterisation
of mesoscale features and phytoplankton variability in the Mozambique
Channel, Deep-Sea Res. Pt. II, 100, 94–105, https://doi.org/10.1016/j.dsr2.2013.10.019,
2014.
Landolfi, A., Koeve, W., Dietze, H., Kähler, P., and Oschlies, A.: A new
perspective on environmental controls of marine nitrogen fixation, Geophys.
Res. Lett., 42, 4482–4489, https://doi.org/10.1002/2015GL063756, 2015.
Langlois, R., Großkopf, T., Mills, M., Takeda, S., and LaRoche, J.:
Widespread distribution and expression of gamma A (UMB), an uncultured,
diazotrophic, γ-proteobacterial nifH phylotype, PLoS One, 10, e0128912,
https://doi.org/10.1371/journal.pone.0128912, 2015.
Leber, G. M. and Beal, L. M.: Local water mass modifications by a solitary
meander in the Agulhas Current, J. Geophys. Res.-Oceans, 120,
4503–4515, https://doi.org/10.1002/2015JC010863, 2015.
Leber, G. M., Beal, L. M., and Elipot, S.: Wind and Current Forcing Combine
to Drive Strong Upwelling in the Agulhas Current, J. Phys. Oceanogr., 47,
123–134, https://doi.org/10.1175/JPO-D-16-0079.1, 2017.
Lee, T. : Decadal weakening of the shallow overturning circulation in the
South Indian Ocean, Geophys. Res. Lett., 31, L18305,
https://doi.org/10.1029/2004GL020884, 2004.
Leetma, A., Quadfasel, D. R., and Wilson, D.: Development of the flow field
during the onset of the Somali current, 1979, J. Phys. Oceanogr., 12,
1325–1342, https://doi.org/10.1175/1520-0485, 1982.
Lenanton, R., Caputi, N., Kangas, M., and Craine, M.: The ongoing influence
of the Leeuwin Current on economically important fish and invertebrates off
temperate Western Australia – has it changed?, J. R. Soc. West. Aus., 92, 111–128, 2009.
Lévy, M., Shankar, D., André, J., Shenoi, S., Durand, F., and de
Boyer Montégut, C.: Basin-wide seasonal evolution of the Indian Ocean's
phytoplankton blooms, J. Geophys. Res.-Oceans,
112, C12014, https://doi.org/10.1029/2007JC004090, 2007.
Lighthill, M. J.: Dynamic response of the Indian Ocean to onset of the
Southwest Monsoon, Philos. T. Roy. Soc. A, 265, 45–92,
https://doi.org/10.1098/rsta.1969.0040, 1969.
Locarnini, R. A., Mishonov, A. V., Baranova, O. K., Boyer, T. P., Zweng, M.
M., Garcia, H. E., Reagan, J. R., Seidov, D., Weathers, K., Paver, C. R., and
Smolyar, I.: World Ocean Atlas 2018, Volume 1: Temperature, A. Mishonov
Technical Ed.; NOAA Atlas NESDIS 81, 52, 2018.
Longhurst, A. R. and Wooster, W. S.: Abundance of oil sardine (Sardinella longiceps) and
upwelling on the southwest coast of India, Can. J. Fish. Aquat., 47,
2407–2419, https://doi.org/10.1139/f90-268, 1990.
Longhurst, A.: A major seasonal phytoplankton bloom in the Madagascar Basin,
Deep-Sea Res. Pt. I, 48, 2413–2422,
https://doi.org/10.1016/S0967-0637(01)00024-3, 2001.
Lotliker, A. A., Baliarsingh, S. K., Trainer, V. L., Wells, M. L., Wilson,
C., Udaya Bhaskar, T. V. S., Samanta, A., and Shahimol, S. R.:
Characterization of oceanic Noctiluca blooms not associated with hypoxia in
the Northeastern Arabian Sea, Harmful Algae, 74, 46–57,
https://doi.org/10.1016/j.hal.2018.03.008, 2018.
Lourey, M. J., Dunn, J. R., and Waring, J.: A mixed-layer nutrient
climatology of Leeuwin Current and Western Australian shelf waters: seasonal
nutrient dynamics and biomass, J. Mar. Syst., 59, 25–51,
https://doi.org/10.1016/j.jmarsys.2005.10.001, 2006.
Lourey, M., Thompson, P., McLaughlin, J., Bonham, P., and Feng, M.: Primary
production and phytoplankton community structure during a winter shelf-scale
phytoplankton bloom off Western Australia, Mar. Biol, 160, 355–369,
https://doi.org/10.1007/s00227-012-2093-4, 2012.
Lowe, R. J., Ivey, G. N., Brinkman, R. M., and Jones, N. L.: Seasonal
circulation and temperature variability near the North West Cape of
Australia, J. Geophys. Res.-Oceans, 117, C04010, https://doi.org/10.1029/2011JC007653, 2012.
Lugomela, C., Lyimo, T. J., Bryceson, I., Semesi, A. K., and Bergman, B.:
Trichodesmium in coastal waters of Tanzania: diversity, seasonality, nitrogen and carbon
fixation, Hydrobiologia, 477, 1–13, https://doi.org/10.1023/A:1021017125376, 2002.
Luis, A. J. and Kawamura, H.: Air-sea interaction, coastal circulation and
primary production in the eastern Arabian sea: A review, J. Oceanogr, 60,
205–218, https://doi.org/10.1023/B:JOCE.0000038327.33559.34, 2004.
Luther, M. E. and O'Brien, J. J.: Modelling the variability of the Somali
Current, in: Mesoscale/synoptic
coherent structures in geophysical turbulence: proceedings of the 20th
International Liège Colloquium on Ocean Hydrodynamics, edited by: Nihoul, J. C. J. and Jamart, B. M., Elsevier
Oceanography Series, 50, 373–386, 1989.
Lutjeharms, J. R. E. and Jorge da Silva, A.: The Delagoa Bight eddy,
Deep-Sea Res., 35, 619–634, https://doi.org/10.1016/0198-0149(88)90134-3, 1988.
Lutjeharms, J. R. E. and Roberts, H. R.: The Natal pulse: An extreme
transient on the Agulhas Current, J. Geophys. Res., 93, 631,
https://doi.org/10.1029/JC093iC01p00631, 1988.
Lutjeharms J. R. E. and Connell, A. D. : The Natal Pulse and inshore
counter currents off the South African east coast, S. Afr. J. Sci., 85,
533–535, 1989.
Lutjeharms, J. R. E. and Machu, E.: An upwelling cell inshore of the East
Madagascar Current, Deep-Sea Res. Pt. I, 47, 2405–2411,
https://doi.org/10.1016/S0967-0637(00)00026-1, 2000.
Lutjeharms, J. R. E., Valentine, H. R., and van Ballegooyen, R. C.: The
hydrography and water masses of the Natal Bight, South Africa, Cont. Shelf
Res. 20, 1907–1939, https://doi.org/10.1016/S0278-4343(00)00053-4, 2000.
Lutjeharms, J. R. E., Boebel, O., van der Vaart, P. C. F., de Ruijter, W. P.
M., Rossby, T., and Bryden, H. L.: Evidence that the natal pulse involves
the Agulhas Current to its full depth, Geophys. Res. Lett., 28,
3449–3452, https://doi.org/10.1029/2000GL012639, 2001.
Lutjeharms, J. R. E., Boebel, O., and Rossby, H. T.: Agulhas cyclones, Deep-Sea Res. Pt. II, 50, 13–34,
https://doi.org/10.1016/S0967-0645(02)00378-8, 2003.
Lutjeharms, J. R. E.: The coastal oceans of south-eastern Africa, in: The
Sea, Volume 14B, edited by: Robinson, A. R. and Brink, K. H., Harvard University
Press, Cambridge, MA, 783–834, 2006.
Lutjeharms, J. R. E.: The Agulhas Current, Springer, Berlin, Heidelbert, New York, 2006.
Machu, E., Lutjeharms, J. R. E., Webb, A. M., and Van Aken, H. M.: First
hydrographic evidence of the southeast Madagascar upwelling cell, Geophys.
Res. Lett., 29, 2009, https://doi.org/10.1029/2002GL015381, 2002.
Madden, R. A. and Julian, P. R.: Description of Global-Scale Circulation
Cells in the Tropics with a 40–50 Day Period, J. Atmos. Sci., 29,
1109–1123, https://doi.org/10.1175/1520-0469, 1972.
Madhupratap, M., Kumar, S. P., Bhattathiri, P., Kumar, M. D., Raghukumar,
S., Nair, K., and Ramaiah, N.: Mechanism of the biological response to
winter cooling in the northeastern Arabian Sea, Nature, 384, 549–552,
https://doi.org/10.1038/384549a0, 1996.
Mahongo, S. B., Francis, J., and Osima, S. E.: Wind Patterns of Coastal
Tanzania: Their Variability and Trends. West, Indian Ocean, J. Mar. Sci., 10, 107–120, 2012.
Malan, N., Backeberg, B., Biastoch, A., Durgadoo, J. V., Samuelsen, A.,
Reason, C., and Hermes, J.: Agulhas Current Meanders Facilitate Shelf-Slope
Exchange on the Eastern Agulhas Bank, J. Geophys. Res.-Oceans, 123,
4762–4778, https://doi.org/10.1029/2017JC013602, 2018.
Malauene, B. S., Shillington, F. A., Roberts, M. J., and Moloney, C. L.: Cool,
elevated chlorophyll a waters off northern Mozambique, Deep-Sea Res. Pt. II
100, 68–78, https://doi.org/10.1016/j.dsr2.2013.10d.017, 2014.
Manghnani, V., Morrison, J. M., Hopkins, T. S., and Bohm,
E.: Advection of upwelled waters in the form of plumes off Oman during the
Southwest Monsoon, Deep-Sea Res. II, 45, 2027–2052,
https://doi.org/10.1016/S0967-0645(98)00062-9, 1998.
Marra, J., Dickey, T. D., Ho, C., Kinkade, C. S., Sigurdson, D. E., Weller,
R., and Barber, R. T.: Variability in primary production as observed from
moored observations in the central Arabian Sea in 1995, Deep-Sea Res., 45,
2253–2267, https://doi.org/10.1016/S0967-0645(98)00070-8, 1998.
McCosker, E., Davies, C. L., and Beckley, L. E.: Oceanographic influence on
coastal zooplankton assemblages at three IMOS National Reference Stations in
Western Australia. Mar. Freshw. Res., 71, 1672–1685
https://doi.org/10.1071/MF19397, 2020.
McCreary Jr., J. P., Kundu, P. K., and Molinari, R. L.: A numerical
investigation of dynamics, thermodynamics and mixed layer processes in the
Indian Ocean, Prog. Oceanogr., 31, 181–244,
https://doi.org/10.1016/0079-6611(93)90002-U, 1993.
McCreary, J. P., Kohler, K. E., Hood, R. R., and Olson, D. B.: A
four-component ecosystem model of biological activity in the Arabian Sea,
Prog. Oceanogr., 37, 193–240,
https://doi.org/10.1016/S0079-6611(96)00005-5, 1996a.
McCreary, J. P., Han, W., Shankar, D., and Shetye, S. R.: Dynamics of the
East India Coastal Current 2. Numerical solutions, J. Geophys. Res., 101,
13993–14010, https://doi.org/10.1029/96jc00560, 1996b.
McCreary, J. P. and Kundu, P. K.: A numerical investigation of the Somali
Current during the Southwest Monsoon, J. Mar. Res, 46, 25–58,
https://doi.org/10.1357/002224088785113711, 1988.
McCreary, J. P., Yu, Z., Hood, R. R., Vinayachandran, P. N., Furue, R., Ishida,
A., and Richards, K.J.: Dynamics of the Indian-Ocean oxygen minimum zones,
Prog. Oceanogr. 112, 15–37, https://doi.org/10.1016/j.pocean.2013.03.002, 2013.
McKinnon, A. and Duggan, S.: Summer egg production rates of paracalanid
copepods in subtropical waters adjacent to Australia's North West Cape,
Hydrobiologia, 453, 121–132, https://doi.org/10.1023/A:1013115900841, 2001.
McKinnon, A. and Duggan, S.: Summer copepod production in subtropical
waters adjacent to Australia's North West Cape, Mar. Biol, 143, 897–907,
https://doi.org/10.1007/s00227-003-1153-1, 2003.
McPhaden, M. J. and Nagura, M.: Indian Ocean Dipole interpreted in terms of
Recharge Oscillator theory, Clim. Dynam., 42, 1569–1586, doi:10.1007/s00382-013-1765-1, 2014.
Menaché, M.: Première campagne océanographique du “Commandant
Robert Giraud” dans le canal de Mozambique, 11 Octobre–28 Novembre 1957.
Cah. Océanogr., 15, 224–235, 1963.
Messie, M., Ledesma, J., Kolber, D., Michisaki, R., Foley, D., and Chavez,
F. : Potential new production estimates in four eastern boundary upwelling
ecosystems, Prog. Oceanogr., 83, 151–158,
https://doi.org/10.1016/j.pocean.2009.07.018, 2009.
Messie, M. and Chavez, F. : Seasonal regulation of primary production in
eastern boundary upwelling systems, Prog. Oceanogr., 134, 1–18,
https://doi.org/10.1016/j.pocean.2014.10.011, 2015.
Meyer, A. A., Lutjeharms, J. R. E., de Villiers, S.: The nutrient
characteristics of the Natal Bight, South Africa, J. Mar. Syst., 35, 11–37,
https://doi.org/10.1016/S0924-7963(02)00043-X, 2002.
Miller, A. R. and Risebrough, R. W.: Preliminary cruise report ATLANTIS II,
Cruise 8: International Indian Ocean Expedition, 5 July 1963–20 December
1963, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA,
32 pp, https://doi.org/10.1575/1912/5872, 1963.
Moffett, J. and Goepfert, T. and Naqvi, S. W. A.: Reduced iron associated
with secondary nitrite maxima in the Arabian Sea. Deep-Sea Res. Pt. I, 54, 1341–1349, https://doi.org/10.1016/j.dsr.2007.04.004.,
2007.
Montecino, V. and Lange, C. B.: The Humboldt Current System: Ecosystem
components and processes, fisheries, and sediment studies, Prog. Oceanogr.,
83, 65–79, https://doi.org/10.1016/j.pocean.2009.07.041, 2009.
Moore, T. S., Matear, R. J., Marra, J., and Clementson, L.: Phytoplankton
variability off the Western Australian Coast: Mesoscale eddies and their
role in cross-shelf exchange, Deep-Sea Res. Pt. II,
54, 943–960, https://doi.org/10.1016/j.dsr2.2007.02.006, 2007.
Morrison, J. M., Codispoti, L. A., Gaurin, S., Jones, B., Manghnani, V., and
Zheng, Z.: Seasonal variation of hydrographic and nutrient fields during the
US JGOFS Arabian Sea Process Study, Deep-Sea Res. Pt. II, 45, 2053–2101,
https://doi.org/10.1016/S0967-0645(98)00063-0, 1998.
Muhling, B. A., Beckley, L. E., and Olivar, M. P.: Ichthyoplankton
assemblage structure in two meso-scale Leeuwin Current eddies, eastern
Indian Ocean, Deep-Sea Res. Pt. II, 54, 1113–1128,
https://doi.org/10.1016/j.dsr2.2006.05.045, 2007.
Muhling, B. A. and Beckley, L. E.: Seasonal variation in horizontal and
vertical structure of larval fish assemblages off south-western Australia,
with implications for larval transport, J. Plankton Res., 29, 967-983,
https://doi.org/10.1093/plankt/fbm072, 2007.
Muhling, B. A., Beckley, L. E., Gaughan, D., Jones, C., Miskiewicz, A., and
Hesp, S.: Spawning, larval abundance and growth rate of Sardinops sagax off
southwestern Australia: influence of an anomalous eastern boundary current,
Mar. Ecol. Prog. Ser., 364, 157–167, https://doi.org/10.3354/meps07480, 2008a.
Muhling, B. A., Beckley, L. E., Koslow, J. A., and Pearce, A. F.: Larval
fish assemblages and water mass structure off the oligotrophic south-western
Australian coast, Fish. Oceanogr., 17, 16–31,
https://doi.org/10.1111/j.1365-2419.2007.00452.x, 2008b.
Mukherjee, A., Shankar, D., Fernando, V., Amol, P., Aparna, S. G.,
Fernandes, R., Michael, G. S., Khalap, S. T., Satelkar, N. P., Agarvadekar,
Y., Gaonkar, M. G., Tari, A. P., Kankonkar, A., and Vernekar, S.: Observed
seasonal and intraseasonal variability of the East India Coastal Current on
the continental slope, J. Earth Syst. Sci., 123, 1197–1232,
https://doi.org/10.1007/s12040-014-0471-7, 2014.
Mukherjee, A., Shankar, D., Chatterjee, A., and Vinayachandran, P. N.:
Numerical simulation of the observed near-surface East India Coastal Current
on the continental slope, Clim. Dynam., 50, 3949–3980,
doi:https://doi.org/10.1007/s00382-017-3856-x, 2017.
Mukherjee, A. and Kalita, B. K: Signature of La Ni ̃na in interannual
variations of the East India Coastal Current during spring, Clim. Dynam., 53,
551–568, https://doi.org/10.1007/s00382-018-4601-9, 2019.
Mukherjee, A., Chatterjee, A., and Francis, P.A.: Role of Andaman and
Nicobar Islands in eddy formation along western boundary of the Bay of
Bengal, Nature Sci. Rep., 9, 10152, https://doi.org/10.1038/s41598-019-46542-9, 2019.
Mukhopadhyay, S., Shankar, D., Aparna, S. G., and Mukherjee, A.: Observations
of the sub-inertial, near-surface East India Coastal Current, Cont. Shelf
Res., 148, 159–177, doi: doi.org/10.1016/j.csr.2017.08.020, 2017.
Mukhopadhyay, S., Shankar, D., Aparna, S. G., Mukherjee, A., Fernando, V.,
Kankonkar, A., Khalap, S., Satelkar, N., Gaonkar, M. G., Tari, A. P.,
Khedekar, R. and Ghatkar, S.: Observed variability of the East India Coastal
Current on the continental slope during 2009–2018, J. Earth Syst. Sci.,
129, 77, https://doi.org/10.1007/s12040-020-1346-8, 2020.
Mulholland, M. R. and Capone, D. G.: Dinitrogen fixation in the Indian
Ocean, Indian Ocean Biogeochem, Process, Ecol. Var., 167–186, https://doi.org/10.1029/2009GM000850, 2009.
Murgese, D. S. and De Deckker, P.: The distribution of deep-sea benthic
foraminifera in core tops from the eastern Indian Ocean, Mar.
Micropaleontol., 56, 25–49, https://doi.org/10.1016/j.marmicro.2005.03.005, 2005.
Murthy, A. V. S.: Observations of coastal upwelling around India, edited by:
Lighthill, J. and Pearse, R. P., Monsoon dynamics, Cambridge University
Press, 523–528, 1981.
Murty, B. C.: On the temperature and salinity structure of the Bay of
Bengal, Curr. Sci., 27, 249–249, 1958.
Murty, C. S. and Varadachari, V. V. R.: Upwelling along the east coast of
India, B. Natl. Inst. Sci. India, 38, 80–86, 1968.
Mwaluma, J.: Zooplankton species distribution and abundance during the
monsoons off the Kenyan coast, 1992, edited by: Heip, C. H. R., Hemminga, M. A., and de
Bie, M. J. M., Monsoons and Coastal Ecosystems in Kenya. Cruise reports
Netherlands Indian Ocean Programme, 5, National Museum of Natural History,
Leiden, Netherlands, 113–115, 1995.
Naqvi, S.: Geographical extent of denitrification in the Arabian Sea in
relation to some physical processes, Oceanologica Acta, 14, 281–290, 1991.
Naqvi, S., Jayakumar, D., Narvekar, P., Naik, H., Sarma, V., D'souza, W.,
Joseph, S., and George, M.: Increased marine production of N2O due to
intensifying anoxia on the Indian continental shelf, Nature, 408, 346–349,
https://doi.org/10.1038/35042551, 2000.
Naqvi, S. W. A., Naik, H., and Narvekar, P. V.: The Arabian Sea, in:
Biogeochemistry of Marine Systems, edited by: Black, K. and Shimmield, G.,
Sheffield Academic Press, Sheffield, 156–206, 2003.
Naqvi, S. W. A., Bange, H. W., Gibb, S. W., Goyet, C., Hatton, A. D., and
Upstill-Goddard, R. C.: Biogeochemical ocean-atmosphere transfers in the
Arabian Sea, Prog. Oceanogr., 65, 116–144,
https://doi.org/10.1016/j.pocean.2005.03.005, 2005.
Naqvi, S. W. A., Naik, H., Jayakumar, D. A., Shailaja, M. S., and NarvekarP.
V.: Seasonal oxygen deficiency over the western continental shelf of India,
in: Past and Present Water Column Anoxia, edited by: Neretin, L. N., NATO
Science Series, IV. Earth and Environmental Sciences, 64, Springer,
Dordrecht, https://doi.org/10.1007/1-4020-4297-3_08, 2006.
Naqvi, S. W. A., Naik,H., Jayakumar, D. A., Pratihary, A., Narvenkar, G.,
Kurian, S., Agnihotri, R., Shailaja, M. S., and Narvekar, P. V.: Seasonal
anoxia over the western Indian continental shelf, in: Indian Ocean:
Biogeochemical Processes and Ecological Variability, edited by: Wiggert, J.
D., Hood, R. R., Naqvi, S. W. A., Brink, K. H., and Smith, S. L., Geophys. Monogr. Ser., AGU, Washington, D.C., 185, 333–345, 2009.
Naqvi, S. W. A., Bange, H. W., Farías, L., Monteiro, P. M. S., Scranton, M. I., and Zhang, J.: Marine hypoxia/anoxia as a source of CH4 and N2O, Biogeosciences, 7, 2159–2190, https://doi.org/10.5194/bg-7-2159-2010, 2010.
Naulita, Y., Arhatin, R. E., and Nabil: Upwelling index along the south coast
of Java from satellite imagery of wind stress and sea surface temperature,
IOP Conf. Series, Earth Environ. Sci., 429, 012025,
https://doi.org/10.1088/1755-1315/429/1/012025, 2020.
Nehring, D.: The oceanological conditions in the western part of the
Mozambique Channel in February-March 1980, Geodät. Geophys.
Veröffentl., 4, 163 pp, 1984.
Nehring, D., Hagen, E., Jorge da Silva, A., Schemainda, R., Wolf, G., Michelchen, N.,
Kaiser, W., Postel, L., Gosselck, F., Brenning, U., Kühner, E.,
Arlt, G., Siegel, H., Gohs, L., and Bublitz, G.: Results of oceanological
studies in the Mozambique Channel in February–March 1980, Beitr.
Meereskd., 56, 51–63, 1987.
Newell, B. S.: The hydrography of the British East African Coastal Waters,
London, East African Marine Fisheries Research Organisation, Fishery
Publications, 12, 23 pp, 1959.
Nguli, M. M.: Temperature, salinity and water mass structure along the
Kenyan coast during the 1992 cruises A1 and A2 of R.V. Tyro, in: Monsoons and Coastal
Ecosystems in Kenya, Cruise reports Netherlands Indian Ocean Programme, edited by: Heip
C. H. R., Hemminga, M. A., and de Bie, M. J. M., 5,
National Museum of Natural History, Leiden, Netherlands, 71–80, 1995.
Noyon, M., Morris, T., Walker, D., and Huggett, J.: Plankton distribution
within a young cyclonic eddy off south-western Madagascar, Deep-Sea Res. Pt. II, 166, 141–150, https://doi.org/10.1016/j.dsr2.2018.11.001, 2019.
Nuncio, M. and Kumar, S. P.: Life cycle of eddies along the western
boundary of the Bay of Bengal and their implications, J. Mar. Syst., 94,
9–17, https://doi.org/10.1016/j.jmarsys.2011.10.002, 2012.
Nyadjro, E. S., Jensen, T. G., Richman, J. G., and Shriver, J. F.: On the
relationship between wind, SST and the thermocline in the Seychelles-Chagos
Thermocline Ridge, IEEE Geosci. Remote Sens. Lett.,
14, 2315–2319, https://doi.org/10.1109/LGRS.2017.2762961,
2017.
Ockhuis, S., Huggett, J.A., Gouws, G., and Sparks, C.: The `suitcase
hypothesis': Can entrainment of meroplankton by eddies provide a pathway for
gene flow between Madagascar and KwaZulu-Natal, South Africa?, Afr. J. Mar.
Sci., 39, 4, 435–451, https://doi.org/10.2989/1814232X.2017.1399292, 2017.
Ogata, T. and Masumoto, Y.: Interactions between mesoscale eddy variability
and Indian Ocean dipole events in the Southeastern tropical Indian
Ocean – case studies for 1994 and 1997/1998, Ocean Dyn., 60, 717–730,
https://doi.org/10.1007/s10236-010-0304-4, 2010.
Ogata, T. and Masumoto, Y.:, Interannual modulation and its dynamics of the
mesoscale eddy variability in the southeastern tropical Indian Ocean, J.
Geophys. Res., 116, C05005, https://doi.org/10.1029/2010JC006490, 2011.
Olsen, E., Padera, M., Funke, M., Pires, P., Wenneck, T., and Zacarias, L.:
Cruise Reports Dr Fridtjof Nansen, Survey of the living marine resources of
North Mozambique (SWIOFP/ASCLME 2009 Cruise 1) 6 August–20 August 2009,
Report No. EAF-N/2009/7, Institute of Marine Research, Bergen, Norway, 2009.
Painter, S. C.: The biogeochemistry and oceanography of the East African
Coastal Current. Prog. Oceanogr., 186, 102374,
https://doi.org/10.1016/j.pocean.2020.102374, 2020.
Panikkar, N. K. and Jayaraman, R.: Biological and oceanographic differences
between the Arabian Sea and the Bay of Bengal as observed from the Indian
region, Proceedings of the Indian Academy of Sciences, 64, 231–240,
https://doi.org/10.1007/BF03052161, 1966.
Pankajakshan, T., Pattanaik, J., and Ghosh, A. K.: An atlas of upwelling
indices along east and west coast of India, IODC, NIO of India, 1997.
Parameswaran, U. V., Abdul Jaleel, K. U., Sanjeevan, V. N., Gopal, A.,
Vijayan, A. K., Gupta, G. V. M., and Sudhakar, M.: Diversity and
distribution of echinoderms in the South Eastern Arabian Sea shelf under the
influence of seasonal hypoxia, Prog. Oceanogr., 165, 189–204,
https://doi.org/10.1016/j.pocean.2018.06.005, 2018.
Paterson, H. L., Feng, M., Waite, A. M., Gomis, D., Beckley L. E., Holliday,
D., and Thompson, P. A.: Physical and chemical signatures of a developing
anti-cyclonic eddy in the Leeuwin Current, Eastern Indian Ocean, J. Geophys.
Res., 113, C07049, https://doi.org/10.1029/2007JC004707, 2008.
Pauly, D. and Christensen, V.: Primary production required to sustain
global fisheries, Nature, 374, 255–257, https://doi.org/10.1038/374255a0, 1995.
Pearce, A. F. and Pattiaratchi, C.: The Capes Current: a summer counter
current flowing past Cape Leeuwin and Cape Naturaliste, Western Australia,
Cont Shelf Res., 19, 401–420, https://doi.org/10.1016/S0278-4343(98)00089-2, 1999.
Pearce, A. F.: Eastern boundary currents of the southern hemisphere, J. R.
Soc. West, Aus., 74, 35–45, 1991.
Pearce, A. F., Lynch, M., and Hanson, C. E.: The Hillarys Transect (1):
seasonal and cross-shelf variability of physical and chemical water
properties off Perth, Western Australia, 1996–98, Cont Shelf Res., 26,
1689–1729, https://doi.org/10.1016/j.csr.2006.05.008, 2006.
Phillips, B. F. and Pearce, A. F.: Spiny lobster recruitment off Western
Australia, Bull. Mar. Sci., 61, 21–41, 1997.
Piontkovski, S. A. and Al-Oufi, H. S.: The Omani shelf hypoxia and the
warming Arabian Sea Int. J. Environ. Sci., 72, 256–264,
https://doi.org/10.1080/00207233.2015.1012361, 2015.
Pivan, X., Krug, M., and Herbette, S.: Observations of the vertical and
temporal evolution of a Natal Pulse along the Eastern Agulhas Bank, J.
Geophys. Res.-Oceans, 121, 7108–7122, https://doi.org/10.1002/2015JC011582, 2016.
Prakash, S. and Ramesh, R.: Is the Arabian Sea getting more productive?,
Curr. Sci., 92, 667–671, 2007.
Prakash, S., Ramesh, R., Sheshshayee, M., Dwivedi, R., and Raman, M.:
Quantification of new production during a winter Noctiluca scintillans bloom
in the Arabian Sea, Geophys. Res. Lett., 35, L08604, https://doi.org/10.1029/2008GL033819,
2008.
Prakash, S., Roy, R., and Lotliker, A.: Revisiting the Noctiluca scintillans
paradox in northern Arabian Sea, Curr. Sci., 113, 1429,
https://doi.org/10.18520/cs/v113/i07/1429-1434, 2017.
Prasanna Kumar, S., Madhupratap, M., Dileep Kumar, M., Muraleedharan, P. M., de Souza, S.
N., Gauns, M., and Sarma, V. V. S. S.: High biological productivity
in the central Arabian Sea during summer monsoon driven by Ekman pumping and
lateral advection, Curr. Sci., 81, 1633–1638, 2001.
Prasanna Kumar, S., Nuncio, M., Ramaiah, N., Sardesai, S., Narvekar, J.,
Fernandes, V., and Paul, J. T.: Eddy-mediated biological productivity in
the Bay of Bengal during fall and spring intermonsoons, Deep-Sea Res. Pt. II, 54, 1619–1640, https://doi.org/10.1016/j.dsr.2007.06.002, 2007.
Praveen, V., Ajayamohan, R. S., Valsala, V., and Sandeep, S.:
Intensification of upwelling along Oman coast in a warming scenario,
Geophys.Res. Lett., 43, 7581–7589, https://doi.org/10.1002/2016GL069638,
2016.
Pripp. T., Gammelsrød, T., and Krakstad, J. O.: Physical influence on
biological production along the western shelf of Madagascar, Deep-Sea Res. Pt. II, 100, 174–183, https://doi.org/10.1016/j.dsr2.2013.10.025, 2014.
Qu, T., Meyers, G. and Godfrey, J. S.: Ocean dynamics in the region between
Australia and Indonesia and its influence on the variation of sea surface
temperature in a global general circulation model, J. Geophys. Res., 99,
18433–18445, https://doi.org/10.1029/94JC00858, 1994.
Qu, T. and Meyers, G.: Seasonal characteristics of circulation in the
southeastern tropical Indian Ocean, J. Phys. Oceanogr., 35, 255–267,
https://doi.org/10.1175/JPO-2682.1, 2005a.
Qu, T. and Meyers, G.: Seasonal variation of barrier layer in the
southeastern tropical Indian Ocean, J. Geophys. Res., 110, C11003,
https://doi.org/10.1029/2004JC002816, 2005b.
Quadfasel, D. and Schott, F.: Water mass distribution at intermediate
layers off the Somali coast during the onset of the southwest monsoon 1979,
J. Phys. Oceanogr., 12, 1358–1372, 1982.
Quadfasel, D. and Cresswell, G. R.: A note on the seasonal variability of
the South Java Current, J. Geophys. Res., 97, 3685–3688,
https://doi.org/10.1029/91JC03056, 1992.
Quartly, G. D. and Srokosz, M. A.: Eddies in the southern Mozambique Channel,
Deep-Sea Res. Pt. II, 51, 69–83, https://doi.org/10.1016/j.dsr2.2003.03.001, 2004.
Raes, E. J., Waite, A. M., McInnes, A. S., Olsen, H., Nguyen, H. M.,
Hardman-Mountford, N., and Thompson, P. A.: Changes in latitude and dominant
diazotrophic community alter N2 fixation, Mar. Ecol. Prog. Ser., 516,
85–102, https://doi.org/10.3354/meps11009, 2014.
Raes, E. J., Thompson, P. A., McInnes, A. S., Nguyen, H. M.,
Hardman-Mountford, N., and Waite, A. M.: Sources of new nitrogen in the
Indian Ocean, Global Biogeochem. Cycles, 29, 1283–1297,
https://doi.org/10.1002/2015GB005194, 2015.
Raes, E. J., Bodrossy, L., van de Kamp, J., Bissett, A., and Waite, A. M.:
Marine bacterial richness increases towards higher latitudes in the eastern
Indian Ocean, Limnol. Oceanogr. Lett., 3, 10–19,
https://doi.org/10.1002/lol2.10058, 2018.
Rahmstorf, S.: Thermohaline circulation: The current climate, Nature,
421, 699–699, https://doi.org/10.1038/421699a, 2003.
Raj, R. P., Peter, B. N., and Pushpadas, D.: Oceanic and atmospheric
influences on the variability of phytoplankton bloom in the Southwestern
Indian Ocean, J. Mar. Syst., 82, 217–229,
https://doi.org/10.1016/j.jmarsys.2010.05.009, 2010.
Ramamirtham, C. P. and Rao, D. S.: On upwelling along the west coast of
India, J. Mar. Biol. Ass. India, 15, 306–317, 1973.
Ramanantsoa, J. D., Krug, M., Penvend, P., Rouault, M., and Gula, J.: Coastal
upwelling south of Madagascar: Temporal and spatial variability, J. Mar.
Syst., 178, 29–37, https://doi.org/10.1016/j.jmarsys.2017.10.005, 2018a.
Ramanantsoa, J. D., Penven, P., Krug, M., Gula, J., and Rouault, M.:
Uncovering a new current: The Southwest MAdagascar Coastal Current. Geophys.
Res. Lett., 45, https://doi.org/10.1002/2017GL075900, 2018b.
Rao, R. R. and Sivakumar, R.: On the possible mechanisms of the evolution
of a mini-warm pool during the pre-summer monsoon season and the genesis of
onset vortex in the South-Eastern Arabian Sea, Q. J. R. Meteorol. Soc., 125, 787–809, https://doi.org/10.1002/qj.49712555503, 1999.
Rao, R. R., Girish Kumar, M. S., Ravichandran, M., Rao, A. R.,
Gopalakrishna, V. V., and Thadathil, P.: Interannual variability of Kelvin
wave propagation in the wave guides of the equatorial Indian Ocean, the
coastal Bay of Bengal and the southeastern Arabian Sea during 1993–2006,
Deep-Sea Res. Pt. I, 57, 1–13, https://doi.org/10.1016/j.dsr.2009.10.008, 2009.
Rao, T. V. N., Rao, D. P., Rao, B. P., and Raju, V. S. R.: Upwelling and
sinking along Visakhapatnam coast, Indian J. Mar. Sci., 15, 84–87, 1986.
Rath, S., Vinayachandran, P. N., Behara, A., and Neema, C. P.: Dynamics of
summer monsoon current around Sri Lanka, Ocean Dynam., 69, 1133–1154,
https://doi.org/10.1007/s10236-019-01295-x, 2019.
Rennie, S. J., Pattiaratchi, C. P., and McCauley, R. D.: Eddy formation
through the interaction between the Leeuwin Current, Leeuwin Undercurrent
and topography, Deep-Sea Res. Pt. II, 54, 818–836,
https://doi.org/10.1016/j.dsr2.2007.02.005, 2007.
Resplandy, L., Vialard, J., Lévy, M., Aumont, O., and Dandonneau, Y.:
Seasonal and intraseasonal biogeochemical variability in the thermocline
ridge of the southern tropical Indian Ocean, J. Geophys. Res., 114,
C07024, https://doi.org/10.1029/2008JC005246, 2009.
Resplandy, L., Lévy, M., Madec, G., Pous, S., Aumont, O., and Kumar, D.: Contribution of mesoscale processes to nutrient budgets in the Arabian
Sea, J. Geophys. Res., 116, C11007,
https://doi.org/10.1029/2011JC007006, 2011.
Ridderinkhof H. and de Ruiter, W.: Moored current observations in the
Mozambique Channel, Deep-Sea Res. Pt. II, 50, 1933–1955,
https://doi.org/10.1016/S0967-0645(03)00041-9, 2003.
Risien, C. M. and C. B.: A Global Climatology of Surface Wind and Wind
Stress Fields from Eight Years of QuikSCAT Scatterometer Data, J. Phys.
Oceanogr., 38, 2379–2413, https://doi.org/10.1175/2008JPO3881.1, 2008.
Rixen, T., Goyet, C., and Ittekkot, V.: Diatoms and their influence on the biologically mediated uptake of atmospheric CO2 in the Arabian Sea upwelling system, Biogeosciences, 3, 1–13, https://doi.org/10.5194/bg-3-1-2006, 2006.
Woulds, C., Bell, J. B., Glover, A. G., Bouillon, S., and Brown, L. S.: Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica, Biogeosciences, 17, 1–12, https://doi.org/10.5194/bg-17-1-2020, 2020.
Roberts, M. J.: Chokka squid (Loligo vulgaris reynaudii) abundance linked
to changes in South Africa's Agulhas Bank ecosystem during spawning and the
early life cycle, ICES J. Mar. Sci., 62, 33–55,
https://doi.org/10.1016/j.icesjms.2004.10.002, 2005.
Roberts, M. J. and van den Berg, M. : Currents along the Tsitsikamma Coast
South Africa and potential transport of squid paralarvae and
ichthyoplankton, Afr. J. Mar. Sci., 27, 375–388,
https://doi.org/10.2989/18142320509504096, 2005.
Roberts, M. J., Ribbink, A. J., Morris, T., Duncan, F., Barlow, R., Kaehler,
S., Huggett, J., Kyewalyanga, M., Harding, R., and van den Berg, M.: 2007
Western Indian Ocean Cruise and Data Report: Alg. 160. African Coelacanth
Ecosystem Programme, Grahamstown, 142 pp, https://doi.org/10.13140/RG.2.2.28920.88324,
2008.
Roberts, M. J., van der Lingen, C. D., Whittle, C., and van den Berg, M.:
Shelf currents, lee-trapped and transient eddies on the inshore boundary of
the Agulhas Current, South Africa: their relevance to the KwaZulu-Natal
sardine run, Afr. J. Mar. Sci., 32, 423–447,
https://doi.org/10.2989/1814232x.2010.512655, 2010.
Roberts, M. J., Ternon, J.-F., and Morris, T.: Interaction of dipole eddies
with the western continental slope of the Mozambique Channel, Deep-Sea Res. Pt. II, 100, 54–67, https://doi.org/10.1016/j.dsr2.2013.10.016, 2014.
Roberts, M.: The Western Indian Ocean Upwelling Research Initiative
(WIOURI): A Flagship IIOE2 Project, CLIVAR Exchanges, 19, 26–30, 2015.
Roberts M, Nieuwenhys C.: Observations and mechanisms of upwelling in the
northern KwaZulu-Natal Bight, Afr. J. Mar. Sci., 38, 43–63, https://doi.org/10.2989/1814232X.2016.1194319, 2016.
Roberts, M., Nieuwenhuys, C., and Guastella, L.: Circulation of shelf waters
in the KwaZulu-Natal Bight, South Africa, Afr. J. Mar. Sci., 38, 7–21,
https://doi.org/10.2989/1814232X.2016.1175383, 2016.
Robinson, A. R. (Ed.): Eddies in Marine Science. Springer-Verlag, Berlin,
1983.
Robinson, J., Guillotreau, P., Jiménez-Toribio, R., Lantz, F., Nadzon,
L., Dorizo, J., Gerry, C., and Marsac, F.: Impacts of climate variability
on the tuna economy of Seychelles, Clim. Res., 43, 149–162,
https://doi.org/10.3354/cr00890, 2010.
Rochford, D. J.: Seasonal interchange of high and low salinity surface
waters off south-west Australia, CSIRO, Division of Fisheries and
Oceanography Technical Paper No. 29, 1969.
Roel, B. A., Hewitson, J., Kerstan, S., and Hampton, I.: The role of the
Agulhas Bank in the life cycle of pelagic fish, S. Afr. J. Sci, 90, 185–96,
1994.
Rossi, V., Feng, M., Pattiaratchi, C., Roughan, M., and Waite, A. M.:
Linking synoptic forcing and local mesoscale processes with biological
dynamics off Ningaloo Reef, J. Geophys. Res.-Oceans, 118, 1211–1225,
https://doi.org/10.1002/jgrc.20110, 2013a.
Rossi, V., Feng, M., Pattiaratchi, C., Roughan, M., and Waite, A. M.: On the
factors influencing the development of sporadic upwelling in the Leeuwin
Current system, J. Geophys. Res.-Oceans, 118, 3608–3621,
https://doi.org/10.1002/jgrc.20242, 2013b.
Rouault, M. J. and Penven, P.: New perspectives on Natal Pulses from satellite
observations, J. Geophys. Res., 116, C07013, https://doi.org/10.1029/2010JC006866, 2011.
Rousseaux, C. S., Lowe, R., Feng, M., Waite, A. M., and Thompson, P. A.: The
role of the Leeuwin Current and mixed layer depth on the autumn
phytoplankton bloom off Ningaloo Reef, Western Australia, Cont Shelf Res.,
32, 22–35, https://doi.org/10.1016/j.csr.2011.10.010, 2012.
Roxy, M. K., Modi, A., Murtugudde, R., Valsala, V., Panickal, S., Prasanna
Kumar, S., and Lévy, M.: A reduction in marine primary productivity
driven by rapid warming over the tropical Indian Ocean, Geophys. Res. Lett.,
43, 826–833, https://doi.org/10.1002/2015GL066979, 2016.
Roy, R., Vinayachandran, P. N., Sarkar, A., George, J., Parida, C., Lotliker, A., Prakash, S., and Choudhury, S. B.: Southern Bay of
Bengal: A possible hotspot for CO2 emission during the summer monsoon,
Prog. Oceanogr., 197,
0079-6611, https://doi.org/10.1016/j.pocean.2021.102638, 2021.
Royal Netherlands Meteorological Institute: Temperature and monthly maps for the Indian Ocean, Edition 135,
Royal Netherlands Meteorological Institute, Den Haag, 1952.
Ruijter, W. D., Leeuwen, P., and Lutjeharms, J.: Generation and Evolution of
Natal Pulses: Solitary Meanders in the Agulhas Current, J. Phys.
Oceanography, 29, 3043–3055,
1999.
Sabarros, P. S., Ménard, F., Lévénez, J.-J., Tew-Kai, E., and
Ternon, J.-F.: Mesoscale eddies influence distribution and aggregation
patterns of micronekton in the Mozambique Channel, Mar. Ecol. Prog. Ser., 395, 101–107, https://doi.org/10.3354/meps08087, 2009.
Sætre, R. and de Paula e Silva: The marine fish resources of
Mozambique. Reports on surveys with the R/V Dr Fridtjof Nansen, Serviço
de Investigações Pesqueiras, Maputo, Institute of Marine Research,
Bergen, Norway, 179 pp, 1979.
Saetre, R. and Jorge Da Silva, A.: Water masses and circulation of the
Mozambique Channel. Revista de Investigacao Pesqueira, No. 3, Instituto de
Desenvolvimento Pesqueiro, Maputo, 83 pp., 1982.
Saji, N. H., Goswami, B. N., Vinayachandran, P. N., and Yamagata, T.: A
dipole mode in the tropical Indian Ocean, Nature, 401, 360–363,
https://doi.org/10.1038/43854, 1999.
Sanilkumar, K. V., Kuruvilla, T. V., Jogendranath, D. and Rao, R. R:
Observations of the Western Boundary Current of the Bay of Bengal from a
hydrographic survey during March 1993, Deep-Sea Res. Pt. I, 44, 135–145,
https://doi.org/10.1016/S0967--0637(96)00036-2, 1997.
Sarma, V. V. S. S.: Net plankton community production in the Arabian Sea
based on O2 mass balance model, Global Biogeochem. Cy., 18,
https://doi.org/10.1029/2003GB002198, 2004.
Sarma, V. V. S. S. Sridevi, B., Maneesha, K., Sridevi, T., Naidu, S. A.,
Prasad, V. R., Venkataraman, V., Achrya, T., Bharati, M. D., Subbaiah,
Ch.V., Kiran, B.S., Reddy, N. C. P., Sarma, V. V., Sadhuram, Y., Murty, T.
V. R: Impact of atmospheric and physical forcings on biogeochemical cycling
of dissolved oxygen and nutrients in the coastal Bay of Bengal, J.
Oceanogr., 69, 229–243, https://doi.org/10.1007/s10872-012-0168-y, 2013.
Sarma, V. V. S. S. and Udaya Bhaskar, T. V. S.: Ventilation of oxygen to
oxygen minimum zone due to anticyclonic eddies in the Bay of Bengal, J.
Geophys. Res.-Biogeo., 123, 2145–2153, https://doi.org/10.1029/2018JG004447, 2018.
Sarma, V. V. S. S., Desai, D. V., Patil, J. S, Khandeparker, L., Aparna, S.
G., Shankar, D., Selrina D'Souza, Dalabehera, H. B., Mukherjee, J.,
Sudharani, P., and Anil, A. C.: Ecosystem response in temperature fronts in
the northeastern Arabian Sea, Progress in Oceanography, 165, 317–331,
https://doi.org/10.1016/j.pocean.2018.02.004, 2018.
Sastry, A. A. R. and Myrland, P.: Distribution of temperature, salinity and
density in the Arabian Sea along the South Malabar Coast (South India)
during the post-monsoon season, Indian J. Fish., 6, 223–255, 1959.
Saunders, M. I., Thompson, P. A., Jeffs, A. G., Säwström, C.,
Sachlikidis, N., Beckley, L. E., and Waite, A. M.: Fussy feeders: phyllosoma
larvae of the western rocklobster (Panulirus cygnus) demonstrate prey preference, PLoS One,
7, e36580, https://doi.org/10.1371/journal.pone.0036580, 2012.
Saville-Kent, W.: The naturalist in Australia, 302 pp.: CRC Press, Boca
Raton, Fla, https://doi.org/10.5962/bhl.title.18339, 1897.
Säwström, C., Beckley, L. E., Saunders, M. I., Thompson, P. A., and
Waite, A. M.: The zooplankton prey field for rock lobster phyllosoma larvae
in relation to oceanographic features of the south-eastern Indian Ocean, J.
Plankton Res., 36, 1003–1016, https://doi.org/10.1093/plankt/fbu019, 2014.
Saxena, H., Sahoo, D., Khan, M. A., Kumar, S., Sudheer, A. K., and Singh, A.:
Dinitrogen fixation rates in the Bay of Bengal during summer monsoon,
Environ. Res. Commun., 2, 051007, https://doi.org/10.1088/2515-7620/ab89fa, 2020.
Schmidt, T. M., DeLong, E. F., and Pace, N. R.: Analysis of a marine
picoplankton community by 16S rRNA gene cloning and sequencing, J.
Bacteriol., 173, 4371–4378, https://doi.org/10.1128/jb.173.14.4371-4378.1991, 1991.
Schott, F.: Monsoon response of the Somali Current and associated upwelling.
Prog. Oceanogr., 12, 357–381, https://doi.org/10.1016/0079-6611(83)90014-9, 1983.
Schott, F. and McCreary, J. P.: The monsoon circulation of the Indian
Ocean, Prog. Oceanogr., 51, 1–123, https://doi.org/10.1016/S0079-6611(01)00083-0,
2001.
Schott, F. A., Xie, S. P., and McCreary, J. P.: Indian Ocean circulation and
climate variability, Rev. Geophys., 47, 1–46,
https://doi.org/10.1029/2007RG000245, 2009.
Sen Gupta, R., Moraes, C., George, M. D., Kureishy, T. W., Noronha, R. J.,
and Fondekar, S. P.: Chemistry and hydrography of the Andaman Sea, Indian J.
Mar. Sci., 10, 228–233, https://doi.org/10.1016/0198-0149(84)90035-9, 1981.
SenGupta, R. and Naqvi, S. W. A.: Chemical Oceanography of the Indian Ocean,
North of equator, Deep-Sea Res., 31, 671–706,
https://doi.org/10.1016/0198-0149(84)90035-9, 1984.
Sewell, R. B. S.: The temperature and salinity of the surface-waters of the
Bay of Bengal and Andaman Sea, with reference to Laccadive Sea, in
Geographic and oceanographic research in Indian waters V, Mem. Asiatic Soc.
of Bay of Bengal, 207–356, 1929.
Shah, P., Sajeev, R., and Gopika, N.: Study of upwelling along the west
coast of India – A climatological approach, J. Coast. Res., 31, 1151–1158,
https://doi.org/10.2112/JCOASTRES-D-13-00094.1, 2015.
Shalapyonok, A., Olson, R. J., and Shalapyonok, L. S.: Arabian Sea
phytoplankton during southwest and northeast Monsoons 1995: composition,
size structure and biomass from individual cell properties measured by flow
cytometry, Deep-Sea Res. Pt. II, 48, 1231–1261,
https://doi.org/10.1016/S0967-0645(00)00137-5, 2001.
Shankar, D. and Shetye, S. R.: On the dynamics of the Lakshadweep High and
Low in the southeastern Arabian Sea, J. Geophys. Res, 102, 12551–12562,
https://doi.org/10.1029/97JC00465, 1997.
Shankar, D., Vinayachandran, P. N., and Unnikrishnan, A. S.: The monsoon
currents in the north Indian Ocean, Prog. Oceanog., 52,
https://doi.org/10.1016/s0079-6611(02)00024-1, 63–120, 2002.
Shankar, D., Remya, R., Anil, A., and Vijith, V.: Role of physical processes
in determining the nature of fisheries in the eastern Arabian Sea, Prog.
Oceanogr., 172, 124–158, https://doi.org/10.1016/j.pocean.2018.11.006, 2019.
Sharma, G. S.: Seasonal variation of some hydrographic properties of the
shelf waters off the west coast of India, Bull. Nat. Inst. Sci. India,
38263–276, 263–276, 1968.
Sharma, G. S.: Upwelling off the southwest coast of India, Indian J. Mar.
Sci., 7, 209–218, 1978.
Shenoi, S. S. C., Saji, P. K., and Almeida, A. M.: Near-surface circulation and
kinetic energy in the tropical Indian Ocean derived from Lagdrangian
drifters, J. Mar. Res., 57, 885–907, https://doi.org/10.1357/002224099321514088,
1999.
Shenoi, S. S. C., Shankar, D., and Shetye, S. R.: Differences in heat
budgets of the near-surface Arabian Sea and Bay of Bengal: Implications for
the summer monsoon, J. Geophys. Res., 107, 3052,
https://doi.org/10.1029/2000JC000679, 2002.
Shenoi, S. C., Shankar, D., Gopalakrishna, V. V., and Durand, F.: Role of
ocean in the genesis and annihilation of the core of the warm pool in the
southeastern Arabian Sea, Mausam, 56, 147–160, 2005.
Shenoy, D. M., Sujith, K. B., Gauns, M. U., Patil, S., Sarkar, A., Naik, H.,
Narvekar, P. V., and Naqvi, S. W. A.: Production of dimethylsulphide during the
seasonal anoxia off Goa, Biogeochemistry, 110, 47–55,
https://doi.org/10.1007/s10533-012-9720-5, 2012.
Shetye, S. R., Chandra Shenoi, S. S., Antony, M. K., and Kumar, V. K.:
Monthly-mean wind stress along the coast of the north Indian Ocean,
Proceedings of the Indian Academy of Sciences – Earth and Planetary
Sciences, 94, 129–137, https://doi.org/10.1007/BF02871945, 1985.
Shetye, S. R., Gouveia, A. D., Shenoi, S. S. C., Sundar, D., Michael, G. S.,
Almeida, A. M., and Santanam, K.: Hydrography and circulation off the west
coast of India during the southwest monsoon 1987, J. Mar. Res., 48,
359–378, https://doi.org/10.1357/002224090784988809, 1990.
Shetye, S. R., Shenoi, S. S. C., Gouveia, A. D., Michael, G. S., Sundar, D.,
and Nampoothiri, G.: Wind-driven coastal upwelling along the western
boundary of the Bay of Bengal during the southwest monsoon, Cont. Shelf
Res., 11, 1397–1408, https://doi.org/10.1016/0278-4343(91)90042-5, 1991.
Shetye, S. R., Gouveia, A. D., Shenoi, S. S. C., Sundar, D., Michael, G. S., and
Nampoothiri, G.: The western boundary current of the seasonal subtropical
gyre in the Bay of Bengal, J. Geophys. Res., 98, 945–954,
https://doi.org/10.1029/92jc02070,1993.
Shetye, S. R., Gouveia, A. D., Shankar, D., Shenoi, S. S. C., Vinayachandran,
P. N., Sundar, D., Michael, G. S., and Nampoothiri, G.: Hydrography and
circulation in the western Bay of Bengal during the northeast monsoon, J.
Geophys. Res., 101, 14011–14025, https://doi.org/10.1029/95jc03307, 1996.
Shetye, S. R. and Gouveia, A. D.: Coastal circulation in the North Indian
Ocean: Coastal segment (14, S-W). In: Robinson, A.R., Brink, K.H. (Eds.),
The Global Coastal Ocean: Regional Studies and Syntheses, The Sea, vol. 11.
John Wiley and Sons, New York, 523–555 (Chapter 18), 1998.
W., Morrison, J. M., Bohm, E., and Manghnani, V.:
The Oman upwelling zone during 1993, 1994 and 1995, Deep-Sea Res. Pt. II, 47,
1227–1247, https://doi.org/10.1016/S0967-0645(99)00142-3, 2000.
Sikka, D. R.: Some aspects of the large scale fluctuations of summer monsoon
rainfall over India in relation to fluctuations in the planetary and
regional scale circulation parameters, Proc. Indian Acad. Sci., 89, 179–195,
https://doi.org/10.1007/BF02913749, 1980.
Singh, A., Gandhi, N., Ramesh, R., and Prakash, S.: Role of cyclonic eddy in
enhancing primary and new production in the Bay of Bengal, J. Sea Res., 97,
5–13, https://doi.org/10.1016/j.seares.2014.12.002, 2015.
Singh, A., Gandhi, N., and Ramesh, R.: Surplus supply of bioavailable
nitrogen through N2 fixation to primary producers in the eastern
Arabian Sea during autumn, Cont. Shelf. Res., 181, 103–110,
https://doi.org/10.1016/j.csr.2019.05.012, 2019.
Smith, R. L. and Bottero, J. S.: On upwelling in the Arabian Sea, in: A voyage of discovery, edited by: Angel, M., 291–304, New York: Pergamon Press.,
1977.
Smith, S. L. and Codispoti, L.: Southwest Monsoon of 1979: Chemical and
biological response of Somali coastal waters, Science, 209, 597–600, https://doi.org/10.1126/science.209.4456.597, 1980.
Smith, R. L., Huyer, A., Godfrey, J. S., and Church, J. A.: The Leeuwin
Current off western Australia, 1986–1987, J. Phys. Oceanogr., 21,
323–345, 1991.
Smitha, B. R., Sanjeevan, V. N., Vimalkumar, K. G., and Revichandran, C.: On
the Upwelling off the southern tip and along the west coast of India, J.
Coast. Res., 95–102, https://doi.org/10.2112/06-0779.1, 2008.
Sprintall, J., Chong, J., Syamsudin, F., Morawitz, W., Hautala, S., Bray,
N., and Wijffels, S.: Dynamics of the South Java Current in the
Indo-Australian basin, Geophys. Res. Lett., 26, 2493–2496,
https://doi.org/10.1029/1999GL002320, 1999.
Sreeush, M. G., Valsala, V., Pentakota, S., Prasad, K. V. S. R., and Murtugudde, R.: Biological production in the Indian Ocean upwelling zones –Part 1: refined estimation via the use of a variable compensation depth in ocean carbon models, Biogeosciences, 15, 1895–1918, https://doi.org/10.5194/bg-15-1895-2018, 2018.
Srokosz, M. A. and Quartly, G. D.: The Madagascar Bloom: A serendipitous
study, J. Geophys. Res.-Oceans, 118, 14–25, https://doi.org/10.1029/2012JC008339, 2013.
Strzelecki, J. and Koslow, J.: Mesoplankton, in: Strategic Research Fund for
the Marine Environment Final Report (Vol. 2), 88–102, CSIRO Australia, 2006.
Strzelecki, J., Koslow, J. A., and Waite, A.: Comparison of mesozooplankton
communities from a pair of warm- and cold-core eddies off the coast of
Western Australia, Deep-Sea Res. Pt. II, 54,
1103–1112, https://doi.org/10.1016/j.dsr2.2007.02.004, 2007.
Sudheesh, V., Gupta, G.V.M., Sudharma, K., Naik, H., Shenoy, D., Sudhakar,
M., and Naqvi, S.: Upwelling intensity modulates N2O concentrations
over the western Indian shelf, J. Geophys. Res.-Oceans, 121, 8551–8565,
https://doi.org/10.1002/2016JC012166, 2016.
Sudheesh, V.: Influence of Upwelling on Seasonal Hypoxia/Anoxia and
Greenhouse Gases along the Southwestern Continental Shelf of India, Ph.D
Thesis, Cochin University of Science and Technology, Cochin,
available at: http://hdl.handle.net/10603/256272 (last access: 5 November 2021), 2018.
Sudheesh, V., Gupta, G. V. M., and Naqvi, S. W. A.: Massive Methane Loss
During Seasonal Hypoxia/Anoxia in the Nearshore Waters of Southeastern
Arabian Sea, Front. Mar. Sci., 7, 324, https://doi.org/10.3389/fmars.2020.00324, 2020.
Suginohara, N.: Coastal upwelling: Onshore-offshore circulation, equatorward
coastal jet and poleward undercurrent over a continental shelf-slope, J.
Phys. Oceanogr., 12, 272–284,1982.
Suresh, I., Vialard, J., Lengaigne, M., Han, W., McCreary, J., Durand, F.,
and Muraleedharan, P. M.: Origins of wind-driven intraseasonal sea level
variations in the North Indian Ocean coastal waveguide, Geophys. Res.
Lett., 40, 5740–5744, https://doi.org/10.1002/2013GL058312,
2013.
Susanto, R. D., Gordon, A. L., and Zheng, Q.: Upwelling along the coasts of
Java and Sumatra and its relation to ENSO, Geophys. Res. Lett., 28,
1599–1602, https://doi.org/10.1029/2000GL011844, 2001.
Susanto, R. D. and Marra, J.: Effect of the 1997/98 El Nino on chlorophyll
a variability along the southern coasts of Java and Sumatra, Oceanography,
18, 124–127, https://doi.org/10.5670/oceanog.2005.13, 2005.
Sutton, A. L. and Beckley, L. E.: Influence of the Leeuwin Current on the
epipelagic euphausiid assemblages of the south-east Indian Ocean,
Hydrobiologia, 779, 193–207, https://doi.org/10.1007/s10750-016-2814-7, 2016.
Sverdrup, H. U.: On the evaporation from the oceans, J. Mar. Res. 1, 3–14,
1937.
Swallow, J. C. and Bruce, J. C.: Current measurements off the Somali coast
during the southwest monsoon of 1964, Deep-Sea Res., 13, 861–888,
https://doi.org/10.1016/0011-7471(76)90908-6, 1966.
Swart, V. P. and Largier, J. L.: Thermal structure of Agulhas Bank water, South
Afr. J. Mar. Sci., 5, 243–252, https://doi.org/10.2989/025776187784522153, 1987.
Takahashi, T., Sutherland, S. C.,Chipman, D. W.,Goddard, J. G., Ho, C.,
Newberger, T., Sweeney, C., and Munro, D. R.: Climatological distributions
of pH, pCO2, total CO2, alkalinity, and CaCO3 saturation in
the global surface ocean, and temporal changes at selected locations, Mar.
Chem., 164, 95–125, https://doi.org/10.1016/j.marchem.2014.06.004, 2014.
Taylor, J. and Pearce, A.: Ningaloo Reef currents: Implications for coral
spawn dispersal, zooplankton and whale shark abundance, J. R. Soc. West Aus,
82, 57–65, 1999.
Ternon, J.-F., Bach, P., Barlow, R., Huggett, J., Jaquemet, S., Marsac, F.,
Menard, F., Penven, P., Potier, M., and Roberts, M.: The Mozambique Channel:
from physics to upper trophic levels, Deep-Sea Res. Pt. II, 100, 1–9,
https://doi.org/10.1016/j.dsr2.2013.10.012, 2014.
Tew-Kai, E. and Marsac, F.: Patterns of variability of sea surface
chlorophyll in the Mozambique Channel: A quantitative approach, J. Mar.
Syst., 77, 77–88, https://doi.org/10.1016/j.jmarsys.2008.11.007, 2009.
Tew Kai, E. and Marsac, F.: Influence of mesoscale eddies on spatial
structuring of top predators' communities in the Mozambique Channel, Prog.
Oceanogr., 86, 214–223, https://doi.org/10.1016/j.pocean.2010.04.010, 2010.
Thompson, R. O. R. Y. and Veronis, G.: Poleward boundary current off Western
Australia, Mar. Freshw. Res., 34, 173–185, https://doi.org/10.1071/MF9830173, 1983.
Thompson, R. O. R. Y.: Observations of the Leeuwin Current off Western
Australia, J. Phys. Oceanogr., 14, 623–628, https://doi.org/10.1175/1520-0485, 1984.
Thompson, R. O. R. Y.: Continental-shelf-scale model of the Leeuwin Current, J.
Mar. Res., 45, 813–827, https://doi.org/10.1357/002224087788327190, 1987.
Thompson, P., Wild-Allen, K., Lourey, M., Rousseaux, C., Waite, A., Feng,
M., and Beckley, L. E.: Nutrients in an oligotrophic boundary current:
evidence of a new role for the Leeuwin Current, Prog. Oceanogr., 91,
345–359, https://doi.org/10.1016/j.pocean.2011.02.011, 2011.
Thushara, V. and Vinayachandran, P. N.: Formation of summer phytoplankton
bloom in the northwestern Bay of Bengal in a coupled physical-ecosystem
model, J. Geophys. Res.-Oceans, 121, 8535–8550, https://doi.org/10.1002/2016JC011987, 2016.
Thushara, V., Vinayachandran, P. N. M., Matthews, A. J., Webber, B. G. M., and Queste, B. Y.: Vertical distribution of chlorophyll in dynamically distinct regions of the southern Bay of Bengal, Biogeosciences, 16, 1447–1468, https://doi.org/10.5194/bg-16-1447-2019, 2019.
Thushara V. and Vinayachandran, P. N. : Unprecedented Surface Chlorophyll
Blooms in the Southeastern Arabian Sea During an Extreme Negative Indian
Ocean Dipole, Geophys. Res. Lett., e2019GL085026, https://doi.org/10.1029/2019GL085026, 2020.
Tomczak, M. and Godfrey, J. S.: Regional Oceanography: An Introduction,
Pergamon Press, Oxford, 1994.
Tranter, D. J. and Newell, B. S.: Enrichment experiments in the Indian Ocean,
Deep-Sea Res., 10, 1–9,
https://doi.org/10.1016/0011-7471(63)90173-6, 1962.
Tranter, D. J. and Kerr, J. D.: Seasonal variations in the Indian Ocean
along 110∘ E. V. Zooplankton biomass, Mar. Freshw. Res.
20, 77–84, 1969.
Tranter, D. J. and Kerr, J. D.: Further studies of plankton ecosystems in the
eastern Indian Ocean, III. Numerical abundance and biomass, Mar. Freshw.
Res., 28, 557–583, 1977.
Tripathi, N., Sahu, L. K., Singh, A., Yadav, R., and Karati, K. K.: High
levels of isoprene in the marine boundary layer of Arabian Sea during spring
inter-monsoon: Role of phytoplankton bloom, ACS Earth and Space Chemistry,
https://doi.org/10.1021/acsearthspacechem.9b00325, 2020a.
Tripathi, N., Sahu, L. K., Singh, A., Yadav, R., Patel, A., Patel, K.,
and Meenu, P.: Elevated levels of biogenic non-methane hydrocarbons in the
marine boundary layer of the Arabian Sea during the inter-monsoon, J.
Geophys. Res.-Atmos., https://doi.org/10.1029/2020JD032869, 2020b.
Tsugawa, M. and Hasumi, H.: Generation and growth mechanism of the Natal
pulse, J. Phys. Oceanogr., 40, 1597–1612, https://doi.org/10.1175/2010JPO4347.1, 2010.
Turpie J. K., Beckley, L. E., and Katua, S. M.: Biogeography and the selection of
priority areas for the conservation of South African coastal fishes, Biol.
Conserv., 92, 59–72, https://doi.org/10.1016/S0006-3207(99)00063-4, 2000.
Twomey, L. J., Waite, A. M., Pez, V., and Pattiaratchi, C. B.: Variability
in nitrogen uptake and fixation in the oligotrophic waters off the south
west coast of Australia, Deep-Sea Res. Pt. II, 54,
925–942, https://doi.org/10.1016/j.dsr2.2006.10.001, 2007.
United States Hydrographic Office: World atlas of sea surface temperatures, 2nd ed., U. S.
Hydrographic Office, Washington D. C., Reprinted 1948, 1944.
Vallivattathillam, P., Iyyappan, S., Lengaigne, M., Ethé, C., Vialard, J., Levy, M., Suresh, N., Aumont, O., Resplandy, L., Naik, H., and Naqvi, W.: Positive Indian Ocean Dipole events prevent anoxia off the west coast of India, Biogeosciences, 14, 1541–1559, https://doi.org/10.5194/bg-14-1541-2017, 2017.
Valsala, V. and Maksyutov, S.: A short surface pathway of the subsurface
Indonesian throughflow water from the Java coast associated with upwelling,
Ekman transport, and subduction, Int. J. Oceanogr., 540783, 1–15,
https://doi.org/10.1155/2010/540783, 2010.
Van Leeuwen, P. J., de Ruijter, W. P. N., and Lutjeharms, J. R. E.: Natal
pulses and the formation of Agulhas Rings, J. Geophys. Res., 105, 6425–6436,
https://doi.org/10.1029/1999JC900196, 2000.
Varadachari, V. V. R.: On the process of upwelling and sinking on the east
coast of India, Os. Univ. Press, Inst. of Oceanogr. Sci., Wormley, England,
Prof. Mahadevan Shastiabdapurti commemoration, 1–27, 1961.
Varela, R., Álvarez, I., Santos, F., deCastro, M., and
Gómez-Gesteira, M.: Has upwelling strengthened along worldwide coasts
over 1982-2010?, Sci. Rep, 5, 10016, https://doi.org/10.1038/srep10016, 2015.
Varela, R., Santos, F., Gómez-Gesteira, M., Álvarez, I., Costoya,
X., and Días, J. M.: Influence of coastal upwelling on SST trends along
the south coast of Java, PLoS One, 11, e0162122,
https://doi.org/10.1371/journal.pone.0162122, 2016.
Veldhuis, M. J., Kraay, G. W., Van Bleijswijk, J. D., and Baars, M. A.:
Seasonal and spatial variability in phytoplankton biomass, productivity and
growth in the northwestern Indian Ocean: The southwest and northeast
monsoon, 1992–1993, Deep-Sea Res. Pt. II,
44, 425–449, https://doi.org/10.1016/S0967-0637(96)00116-1, 1997.
Vialard, J., Foltz, G. R., McPhaden, M. J., Duvel, J. P., and de Boyer M.:
Strong Indian Ocean sea surface temperature signals associated with the
Madden-Julian Oscillation in late 2007 and early 2008, Geophys. Res. Lett.,
35, L19608, https://doi.org/10.1029/ 2008GL035238, 2008.
Vialard, J., Shenoi, S. S. C., McCreary, J. P., Shankar, D., Durand, F.,
Fernando, V., and Shetye, S. R.: Intraseasonal response of the northern
Indian Ocean coastal waveguide to the Madden-Julian Oscillation, Geophys.
Res. Lett., 36, L14606, https://doi.org/10.1029/2009GL038450, 2009a.
Vialard, J., Duvel, J. P., McPhaden, M. J., Bouruet-Aubertot, P., Ward, B.,
Key, E., Bourras, D., Weller, R., Minnett, P., Weill, A., Cassou, C.,
Eymard, L., Fristedt, T., Basdevant, C., Dandonneau, Y., Duteil, O., Izumo,
T., de Boyer Montégut, C., Masson, S., and Kennan, S.:
Cirene: Air – Sea Interactions in the Seychelles – Chagos Thermocline Ridge
Region, B. Am. Meteor Soc., 90, 45–62,
https://doi.org/10.1175/2008BAMS2499.1, 2009b.
Vic, C., Capet, X., Roullet, G., and Carton, X.: Western boundary upwelling
dynamics off Oman. Ocean Dynam., 67, 585–595, https://doi.org/10.1007/s10236-017-1044-5, 2017.
Vidya, P. J., Das, S. M., and Murali, R.: Contrasting Chl-a responses to the
tropical cyclones Thane and Phailin in the Bay of Bengal, J. Mar. Syst., 165, 103–114, https://doi.org/10.1016/j.jmarsys.2016.10.001, 2017.
Vijith, V., Vinayachandran, P. N., Thushara, V., Amol, P., Shankar, D., and Anil, A.
C.: Consequences of inhibition of mixed-layer deepening by the
West India Coastal Current for winter phytoplankton bloom in the
northeastern Arabian Sea, J. Geophys. Res.-Oceans, 121, 6583–6603,
https://doi.org/10.1002/2016JC012004, 2016.
Vinayachandran, P. N. and Shetye, S. R.: The warm pool in the Indian Ocean,
Proceedings of the Indian Academy of Sciences – Earth and Planetary
Sciences, 100, 165–175, https://doi.org/10.1007/BF02839431, 1991.
Vinayachandran, P. N., Shetye, S. R., Sengupta, D., and Gadgil, S.: Forcing
mechanisms of the Bay of Bengal circulation, Curr. Sci., 71, 753–763, 1996.
Vinayachandran, P. N. and Yamagata, T.: Monsoon Response of the Sea around
Sri Lanka: Generation of Thermal Domes and Anticyclonic Vortices, J. Phys.
Oceanogr., 28, 1946–1960, 1998.
Vinayachandran, P. N., Masumoto, Y., Mikawa, T., and Yamagata, T. :
Intrusion of the Southwest Monsoon Current into the Bay of Bengal J.
Geophys. Res.-Oceans, 104, 11077–1108, 1999.
Vinayachandran, P. N., Murty, V. S. N., and Ramesh Babu, V.: Observations of
barrier layer formation in the Bay of Bengal during summer monsoon, J.
Geophys. Res.-Oceans, 107, C12, https://doi.org/10.1029/2001JC000831, 2002.
Vinaychandran, P. N. and Mathew, S.: Phytoplankton bloom in the Bay of Bengal
during the northeast monsoon and its intensification by cyclones, Geophys.
Res. Lett., 30, 1572, https://doi.org/10.1029/2002GL016717, 2003.
Vinayachandran, P. N., Chauhan, P., Mohan, M., and Nayak, S.: Biological
response of the sea around Sri Lanka to summer monsoon, Geophys. Res.
Lett., 31, L01302, https://doi.org/10.1029/2003GL018533, 2004.
Vinayachandran, P. N., McCreary Jr., J. P., Hood, R. R. and Kohler, K. E.: A
numerical investigation of the phytoplankton bloom in the Bay of Bengal
during Northeast Monsoon, J. Geophys. Res., 110, C12001, https://doi.org/10.1029/2005JC002966, 2005.
Vinayachandran, P. N., Shankar, D., Kurian, J., Durand, F., and Shenoi, S.
S. C.: Arabian Sea Mini warm pool and the monsoon onset vortex, Curr. Sci.,
93, 203–214, 2007.
Vinayachandran, P. N. and Saji, N. H.: Mechanisms of South Indian Ocean
intraseasonal cooling, Geophys. Res. Lett., 35, L23607, https://doi.org/10.1029/2008GL035733, 2008.
Vinayachandran, P. N.: Impact of Physical Processes on Chlorophyll
Distribution in the Bay of Bengal, AGU, Washington, D. C., 71–86,
https://doi.org/10.1029/2008GM000705, 2009.
Vinayachandran, P. N., Matthews, A. J., Kumar, K. V., Sanchez-Franks, A.,
Thushara, V., George, J., Vijith, V., Webber, B. G. M., Queste, B. Y., Roy,
R., Sarkar, A., Baranowski, D. B., Bhat, G. S., Klingaman, N. P., Peatman,
S. C., Parida, C., Heywood, K. J., Hall, R., King, B., and Joshi,
M: BoBBLE: Ocean–Atmosphere Interaction and Its Impact on the South Asian
Monsoon, B. Am. Meteorol. Soc., 99, 1569–1587,
https://doi.org/10.1175/BAMS-D-16-0230.1, 2018.
Vinayachandran, P. N., Umasankar Das, Shankar, D., Jahfer, A., Behara, A.,
Balakrishnan Nair, T. M., and Bhat, G. S.: Maintenance of the southern Bay of
Bengal cold pool, Deep-Sea Res. Pt. II, 179, 104624,
https://doi.org/10.1016/j.dsr2.2019.07.012, 2020.
Waite, A., Muhling, B. A., Holl, C. M., Beckley, L. E., Montoya, J. P.,
Strzelecki, J., Thompson, P. A., and Pesant, S. C.: Food web structure in two
counter-rotating eddies based on δ15N and δ13C isotopic
analyses, Deep-Sea Res. Pt. II, 54, 1055–1075,
https://doi.org/10.1016/j.dsr2.2006.12.010, 2007a.
Waite, A., Thompson, P. A., Pesant, S. C., Feng, M., Beckley, L. E.,
Domingues, C. M., Gaughan, D., Hanson, C., Holl, C. M., Koslow, T.,
Meuleners, M., Montoya, J. P., Moore, T., Muhling, B. A., Paterson, H.,
Rennie, S., Strzelecki, J., and Twomey, L.: The Leeuwin Current and its
eddies: An introductory overview, Deep-Sea Res. Pt. II, 54, 789–796, https://doi.org/10.1016/j.dsr2.2006.12.008, 2007b.
Waite, A. M., Rossi, V., Roughan, M., Tilbrook, B., Thompson, P. A., Feng, M., Wyatt, A. S. J., and Raes, E. J.: Formation and maintenance of high-nitrate, low pH layers in the eastern Indian Ocean and the role of nitrogen fixation, Biogeosciences, 10, 5691–5702, https://doi.org/10.5194/bg-10-5691-2013, 2013.
Waite, A. M., Beckley, L. E., Guidi, L., Landrum, J. P., Holliday, D.,
Montoya, J., Paterson, H., Feng, M., Thompson, P. A., and Raes, E. J.:
Cross-shelf transport, oxygen depletion, and nitrate release within a
forming mesoscale eddy in the eastern Indian Ocean, Limnol. Oceanogr.,
61, 103–121, https://doi.org/10.1002/lno.10218, 2016.
Waite, A. M., Raes, E., Beckley, L. E., Thompson, P. A., Griffin, D.,
Saunders, M., Säwström, C., O'Rorke, R., Wang, M., Landrum, J. P.,
and Jeffs, A.: Production and ecosystem structure in cold-core vs. warm-core
eddies: Implications for the zooplankton isoscape and rock lobster larvae,
Limnol. Oceanogr., 64, 2405–2423, https://doi.org/10.1002/lno.11192, 2019.
Walker, N. D.: Satellite observations of the Agulhas Current and episodic
upwelling south of Africa. Deep-Sea Res., 33, 1083–1106,
https://doi.org/10.1016/0198-0149(86)90032-4, 1986.
Wallen, I. E.: The International Indian Ocean Expedition: A Status Report,
Journal of the Washington Academy of Sciences, 54, 3, March 1964, 45–53, 1964.
Wang, Y. and McPhaden, M. J.: Seasonal cycle of cross-equatorial flow in
the central Indian Ocean. J. Geophys. Res.-Oceans, 122, 3817–3827,
https://doi.org/10.1002/2016JC012537, 2017.
Warren, B. A.: Medieval Arab references to the seasonally reversing currents
of the north Indian Ocean, Deep-Sea Res., 13, 167–171,
https://doi.org/10.1016/0011-7471(66)91097-7, 1966.
Warren, B. A.: The shallow oxygen minimum of the South Indian Ocean, Deep-Sea Res. Pt. I, 28, 859–864,
https://doi.org/10.1016/S0198-0149(81)80005-2, 1981.
Weaver, A. J. and Middleton, J. H.: On the dynamics of the Leeuwin Current,
J. Phys. Oceanogr., 19, 626–648, 1989.
Webber, B. G. M., Matthews, A. J., Vinayachandran, P. N., Neema, C. P.,
Sanchez-Franks, A., Vijith, V., Amol, P., and Baranowski, D. B.: The
Dynamics of the Southwest Monsoon Current in 2016 from High-Resolution In
Situ Observations and Models, J. Phys. Oceanogr., 48, 2259–2282,
https://doi.org/10.1175/JPO-D-17-0215.1, 2018.
Webster, P. J., Moore, A. M., Loschnigg, J. P., and Leben, R. R.: Coupled
ocean-atmosphere dynamics in the Indian Ocean during 1997-98, Nature,
401, 356–360, https://doi.org/10.1038/43848, 1999.
Wei, X., Liao, X., Zhan, H., and Liu, H.: Estimates of potential new
production in the Java-Sumatra upwelling system, Chin. J. Oceanol. Limnol.,
30, 1063–1067, https://doi.org/10.1007/s00343-012-1281-x, 2012.
Weimerskirch, H., Le Corre, M., Jaquemet, S., Potier, M., and Marsac, F.:
Foraging strategy of a top predator in tropical waters: great frigate birds
in the Mozambique Channel, Mar. Ecol. Prog. Ser., 275, 297–308,
https://doi.org/10.3354/meps275297, 2004.
Weller, E., Holliday, D., Feng, M., Beckley, L., and Thompson, P.: A
continental shelf scale examination of the Leeuwin Current off Western
Australia during the austral autumn–winter, Cont Shelf Res., 31,
1858–1868, https://doi.org/10.1016/j.csr.2011.08.008, 2011.
Wiggert, J., Hood, R., Banse, K., and Kindle, J.: Monsoon-driven
biogeochemical processes in the Arabian Sea, Prog. Oceanogr., 65,
176–213, https://doi.org/10.1016/j.pocean.2005.03.008, 2005.
Wiggert, J. D., Murtugudde, R. G., and Christian, J. R.: Annual ecosystem
variability in the tropical Indian Ocean: results of a coupled bio-physical
ocean general circulation model, Deep-Sea Res. Pt. II, 53, 644–676, 2006.
Wiggert, J. D., and Murtugudde, R. G.: The sensitivity of the Southwest
Monsoon phytoplankton bloom to variations in aeolian iron deposition over
the Arabian Sea, J. Geophys. Res., 112, C05005,
https://doi.org/10.1029/2006JC003514, 2007.
Wilson, S., Carleton, J., and Meekan, M.: Spatial and temporal patterns in
the distribution and abundance of macrozooplankton on the southern North
West Shelf, Western Australia, Estuar. Coast. Shelf Sci., 56, 897–908,
https://doi.org/10.1016/S0272-7714(02)00285-8, 2003.
Wirth, A., Willebrand, J., and Schott, F.: Variability of the Great Whirl
from observations and models, Deep-Sea Res. Pt. II, 49, 1279–1295,
https://doi.org/10.1016/S0967-0645(01)00165-5, 2002.
Woo, M., Pattiaratchi, C., and Schroeder, W.: Dynamics of the Ningaloo
Current off Point Cloates, Western Australia, Mar. Freshw. Res., 57,
291–301, https://doi.org/10.1071/mf05106, 2006a.
Woo, M., Pattiaratchi, C., and Schroeder, W.: Summer surface circulation
along the Gascoyne continental shelf, Western Australia, Cont Shelf Res.,
26, 132–152, https://doi.org/10.1016/j.csr.2005.07.007, 2006b.
Woo, M. and Pattiaratchi, C.: Hydrography and water masses off the western
Australian coast, Deep-Sea Res. Pt. I, 55,
1090–1104, https://doi.org/10.1016/j.dsr.2008.05.005, 2008.
Wright, J. J., Konwar, K. M., and Hallam, S. J.: Microbial ecology of
expanding oxygen minimum zones, Nature Publishing Group, 10, 381–394,
https://doi.org/10.1038/nrmicro2778, 2012.
Wyrtki, K.: The upwelling in the region between Java and Australia during
the South-East monsoon, Aust. J. Mar. Freshw. Res., 13, 217–225,
https://doi.org/10.1071/MF9620217, 1962.
Wyrtki, K.: Physical oceanography of the Indian Ocean, The biology of the Indian Ocean, Springer-Verlag, New York,
18–36. 1973.
Xie, S.-P., Annamalai, H., Schott, F. A., and McCreary Jr. J.P.: Structure
and mechanism of South Indian Ocean climate variability, J. Climate, 15, 864–878,
https://doi.org/10.1175/1520-0442, 2002.
Xu, J., Lowe, R. J., Ivey, G. N., Pattiaratchi, C., Jones, N. L., and
Brinkman, R.: Dynamics of the Wei summer shelf circulation and transient
upwelling off Ningaloo Reef, Western Australia, J. Geophys. Res.-Oceans,
118, 1099–1125, https://doi.org/10.1002/jgrc.20098, 2013.
Xue, L., Wang, H., Jiang, L.-Q., Cai, W.-J., Wei, Q., Song, H.,Kuswardani,
R. T. D., Pranowo, W. S., Beck, B., Liu, L., and Yu, W.: Aragonite saturation
state in a monsoonal upwelling system off Java, Indonesia, J. Mar. Sys.,
153, 10–17, https://doi.org/10.1016/j.jmarsys.2015.08.003, 2016.
Yamagata, T., Behera, S. K., Luo, J.-J., Masson, S., Jury, M. R., and Rao,
S. A.: Coupled Ocean-Atmosphere Variability in the Tropical Indian Ocean,
Geophysical Monograph Series, 147, 189–211,
https://doi.org/10.1029/147GM12, 2004.
Yokoi, T., Tozuka, T., and Yamagata, T.: Seasonal Variations of the
Seychelles Dome Simulated in the CMIP3 Models, J. Phys. Oceanogr., 39,
449–457, https://doi.org/10.1175/2008JPO3914.1, 2008.
Yu, W., Hood, R., D'Adamo, N., McPhaden, M., et al.: Eastern Indian Ocean
upwelling Research Initiative (EIOURI), The EIOURI Science Plan, ESSO –
Indian National Centre for Ocean Information Services (INCOIS), Hyderabad,
India, 49 pp, 2016.
Zavala-Garay, J., Theiss, J., Moulton, M., Walsh C., van Woesik R.,
Mayorga-Adame, C. G., García-Reyes, M., Mukaka, D. S., Whilden K., and
Shaghude, Y. W.: On the dynamics of the Zanzibar Channel, J. Geophys. Res.-Oceans, 120, 6091–6113, https://doi.org/10.1002/2015JC010879, 2015.
Short summary
Upwelling in the coastal ocean triggers biological productivity and thus enhances fisheries. Therefore, understanding the phenomenon of upwelling and the underlying mechanisms is important. In this paper, the present understanding of the upwelling along the coastline of the Indian Ocean from the coast of Africa all the way up to the coast of Australia is reviewed. The review provides a synthesis of the physical processes associated with upwelling and its impact on the marine ecosystem.
Upwelling in the coastal ocean triggers biological productivity and thus enhances fisheries....
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