Articles | Volume 18, issue 23
https://doi.org/10.5194/bg-18-6349-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-6349-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
13 Dec 2021
Research article |
| 13 Dec 2021
| 13 Dec 2021
Seasonal dispersal of fjord meltwaters as an important source of iron and manganese to coastal Antarctic phytoplankton
Scripps Institution of Oceanography, University of California San
Diego, La Jolla, 92037, USA
Lisa Hahn-Woernle
Department of Oceanography, University of Hawai'i, Manoa, 96822, USA
Robert M. Sherrell
Departments of Marine and Coastal Sciences and Earth and Planetary
Sciences, Rutgers University, New Brunswick, 08901, USA
Vincent J. Roccanova
Departments of Marine and Coastal Sciences and Earth and Planetary
Sciences, Rutgers University, New Brunswick, 08901, USA
Kaixuan Bu
Departments of Marine and Coastal Sciences and Earth and Planetary
Sciences, Rutgers University, New Brunswick, 08901, USA
David Burdige
Department of Ocean & Earth Sciences, Old Dominion University,
Norfolk, 23529, USA
Maria Vernet
Scripps Institution of Oceanography, University of California San
Diego, La Jolla, 92037, USA
Katherine A. Barbeau
Scripps Institution of Oceanography, University of California San
Diego, La Jolla, 92037, USA
Related authors
No articles found.
Songyun Fan, Yuan Gao, Robert M. Sherrell, Shun Yu, and Kaixuan Bu
Atmos. Chem. Phys., 21, 2105–2124, https://doi.org/10.5194/acp-21-2105-2021, https://doi.org/10.5194/acp-21-2105-2021, 2021
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Aerosol sampling was carried out at Palmer Station in the west Antarctic Peninsula during the austral summer of 2016–2017. This study generated new data on the concentrations and particle-size distributions of aerosol trace elements in the marine atmosphere over this region. Measurement data allowed estimating the dry deposition fluxes. The new results are critically important to understanding the properties of aerosol particles and regional biogeochemical cycles.
J. Peloquin, C. Swan, N. Gruber, M. Vogt, H. Claustre, J. Ras, J. Uitz, R. Barlow, M. Behrenfeld, R. Bidigare, H. Dierssen, G. Ditullio, E. Fernandez, C. Gallienne, S. Gibb, R. Goericke, L. Harding, E. Head, P. Holligan, S. Hooker, D. Karl, M. Landry, R. Letelier, C. A. Llewellyn, M. Lomas, M. Lucas, A. Mannino, J.-C. Marty, B. G. Mitchell, F. Muller-Karger, N. Nelson, C. O'Brien, B. Prezelin, D. Repeta, W. O. Jr. Smith, D. Smythe-Wright, R. Stumpf, A. Subramaniam, K. Suzuki, C. Trees, M. Vernet, N. Wasmund, and S. Wright
Earth Syst. Sci. Data, 5, 109–123, https://doi.org/10.5194/essd-5-109-2013, https://doi.org/10.5194/essd-5-109-2013, 2013
Related subject area
Biogeochemistry: Coastal Ocean
Production and accumulation of reef framework by calcifying corals and macroalgae on a remote Indian Ocean cay
Zooplankton community succession and trophic links during a mesocosm experiment in the coastal upwelling off Callao Bay (Peru)
Temporal and spatial evolution of bottom-water hypoxia in the St Lawrence estuarine system
Significant nutrient consumption in the dark subsurface layer during a diatom bloom: a case study on Funka Bay, Hokkaido, Japan
Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf
Sediment quality assessment in an industrialized Greek coastal marine area (western Saronikos Gulf)
Limits and CO2 equilibration of near-coast alkalinity enhancement
Role of phosphorus in the seasonal deoxygenation of the East China Sea shelf
Interannual variability of the initiation of the phytoplankton growing period in two French coastal ecosystems
Spatio-temporal distribution, photoreactivity and environmental control of dissolved organic matter in the sea-surface microlayer of the eastern marginal seas of China
Metabolic alkalinity release from large port facilities (Hamburg, Germany) and impact on coastal carbon storage
Impacts and uncertainties of climate-induced changes in watershed inputs on estuarine hypoxia
A Numerical reassessment of the Gulf of Mexico carbon system in connection with the Mississippi River and global ocean
Observed and projected global warming pressure on coastal hypoxia
Benthic alkalinity fluxes from coastal sediments of the Baltic and North seas: comparing approaches and identifying knowledge gaps
Investigating the effect of nickel concentration on phytoplankton growth to assess potential side-effects of ocean alkalinity enhancement
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
Drifting macrophyte detritus triggers ‘hidden’ benthic hypoxia
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
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
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
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
Reviews and syntheses: Physical and biogeochemical processes associated with upwelling in the Indian Ocean
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
M. James McLaughlin, Cindy Bessey, Gary A. Kendrick, John Keesing, and Ylva S. Olsen
Biogeosciences, 20, 1011–1026, https://doi.org/10.5194/bg-20-1011-2023, https://doi.org/10.5194/bg-20-1011-2023, 2023
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Coral reefs face increasing pressures from environmental change at present. The coral reef framework is produced by corals and calcifying algae. The Kimberley region of Western Australia has escaped land-based anthropogenic impacts. Specimens of the dominant coral and algae were collected from Browse Island's reef platform and incubated in mesocosms to measure calcification and production patterns of oxygen. This study provides important data on reef building and climate-driven effects.
Patricia Ayón Dejo, Elda Luz Pinedo Arteaga, Anna Schukat, Jan Taucher, Rainer Kiko, Helena Hauss, Sabrina Dorschner, Wilhelm Hagen, Mariona Segura-Noguera, and Silke Lischka
Biogeosciences, 20, 945–969, https://doi.org/10.5194/bg-20-945-2023, https://doi.org/10.5194/bg-20-945-2023, 2023
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Ocean upwelling regions are highly productive. With ocean warming, severe changes in upwelling frequency and/or intensity and expansion of accompanying oxygen minimum zones are projected. In a field experiment off Peru, we investigated how different upwelling intensities affect the pelagic food web and found failed reproduction of dominant zooplankton. The changes projected could severely impact the reproductive success of zooplankton communities and the pelagic food web in upwelling regions.
Mathilde Jutras, Alfonso Mucci, Gwenaëlle Chaillou, William A. Nesbitt, and Douglas W. R. Wallace
Biogeosciences, 20, 839–849, https://doi.org/10.5194/bg-20-839-2023, https://doi.org/10.5194/bg-20-839-2023, 2023
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The deep waters of the lower St Lawrence Estuary and gulf have, in the last decades, experienced a strong decline in their oxygen concentration. Below 65 µmol L-1, the waters are said to be hypoxic, with dire consequences for marine life. We show that the extent of the hypoxic zone shows a seven-fold increase in the last 20 years, reaching 9400 km2 in 2021. After a stable period at ~ 65 µmol L⁻¹ from 1984 to 2019, the oxygen level also suddenly decreased to ~ 35 µmol L-1 in 2020.
Sachi Umezawa, Manami Tozawa, Yuichi Nosaka, Daiki Nomura, Hiroji Onishi, Hiroto Abe, Tetsuya Takatsu, and Atsushi Ooki
Biogeosciences, 20, 421–438, https://doi.org/10.5194/bg-20-421-2023, https://doi.org/10.5194/bg-20-421-2023, 2023
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We conducted repetitive observations in Funka Bay, Japan, during the spring bloom 2019. We found nutrient concentration decreases in the dark subsurface layer during the bloom. Incubation experiments confirmed that diatoms could consume nutrients at a substantial rate, even in darkness. We concluded that the nutrient reduction was mainly caused by nutrient consumption by diatoms in the dark.
Dirk Jong, Lisa Bröder, Tommaso Tesi, Kirsi H. Keskitalo, Nikita Zimov, Anna Davydova, Philip Pika, Negar Haghipour, Timothy I. Eglinton, and Jorien E. Vonk
Biogeosciences, 20, 271–294, https://doi.org/10.5194/bg-20-271-2023, https://doi.org/10.5194/bg-20-271-2023, 2023
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With this study, we want to highlight the importance of studying both land and ocean together, and water and sediment together, as these systems function as a continuum, and determine how organic carbon derived from permafrost is broken down and its effect on global warming. Although on the one hand it appears that organic carbon is removed from sediments along the pathway of transport from river to ocean, it also appears to remain relatively ‘fresh’, despite this removal and its very old age.
Georgia Filippi, Manos Dassenakis, Vasiliki Paraskevopoulou, and Konstantinos Lazogiannis
Biogeosciences, 20, 163–189, https://doi.org/10.5194/bg-20-163-2023, https://doi.org/10.5194/bg-20-163-2023, 2023
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The pollution of the western Saronikos Gulf from heavy metals has been examined through the study of marine sediment cores. It is a deep gulf (maximum depth 440 m) near Athens affected by industrial and volcanic activity. Eight cores were received from various stations and depths and analysed for their heavy metal content and geochemical characteristics. The results were evaluated by using statistical methods, environmental indicators and comparisons with old data.
Jing He and Michael D. Tyka
Biogeosciences, 20, 27–43, https://doi.org/10.5194/bg-20-27-2023, https://doi.org/10.5194/bg-20-27-2023, 2023
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Recently, ocean alkalinity enhancement (OAE) has gained interest as a scalable way to address the urgent need for negative CO2 emissions. In this paper we examine the capacity of different coastlines to tolerate alkalinity enhancement and the time scale of CO2 uptake following the addition of a given quantity of alkalinity. The results suggest that OAE has significant potential and identify specific favorable and unfavorable coastlines for its deployment.
Arnaud Laurent, Haiyan Zhang, and Katja Fennel
Biogeosciences, 19, 5893–5910, https://doi.org/10.5194/bg-19-5893-2022, https://doi.org/10.5194/bg-19-5893-2022, 2022
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The Changjiang is the main terrestrial source of nutrients to the East China Sea (ECS). Nutrient delivery to the ECS has been increasing since the 1960s, resulting in low oxygen (hypoxia) during phytoplankton decomposition in summer. River phosphorus (P) has increased less than nitrogen, and therefore, despite the large nutrient delivery, phytoplankton growth can be limited by the lack of P. Here, we investigate this link between P limitation, phytoplankton production/decomposition, and hypoxia.
Coline Poppeschi, Guillaume Charria, Anne Daniel, Romaric Verney, Peggy Rimmelin-Maury, Michaël Retho, Eric Goberville, Emilie Grossteffan, and Martin Plus
Biogeosciences, 19, 5667–5687, https://doi.org/10.5194/bg-19-5667-2022, https://doi.org/10.5194/bg-19-5667-2022, 2022
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This paper aims to understand interannual changes in the initiation of the phytoplankton growing period (IPGP) in the current context of global climate changes over the last 20 years. An important variability in the timing of the IPGP is observed with a trend towards a later IPGP during this last decade. The role and the impact of extreme events (cold spells, floods, and wind burst) on the IPGP is also detailed.
Lin Yang, Jing Zhang, Anja Engel, and Gui-Peng Yang
Biogeosciences, 19, 5251–5268, https://doi.org/10.5194/bg-19-5251-2022, https://doi.org/10.5194/bg-19-5251-2022, 2022
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Enrichment factors of dissolved organic matter (DOM) in the eastern marginal seas of China exhibited a significant spatio-temporal variation. Photochemical and enrichment processes co-regulated DOM enrichment in the sea-surface microlayer (SML). Autochthonous DOM was more frequently enriched in the SML than terrestrial DOM. DOM in the sub-surface water exhibited higher aromaticity than that in the SML.
Mona Norbisrath, Johannes Pätsch, Kirstin Dähnke, Tina Sanders, Gesa Schulz, Justus E. E. van Beusekom, and Helmuth Thomas
Biogeosciences, 19, 5151–5165, https://doi.org/10.5194/bg-19-5151-2022, https://doi.org/10.5194/bg-19-5151-2022, 2022
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Total alkalinity (TA) regulates the oceanic storage capacity of atmospheric CO2. TA is also metabolically generated in estuaries and influences coastal carbon storage through its inflows. We used water samples and identified the Hamburg port area as the one with highest TA generation. Of the overall riverine TA load, 14 % is generated within the estuary. Using a biogeochemical model, we estimated potential effects on the coastal carbon storage under possible anthropogenic and climate changes.
Kyle E. Hinson, Marjorie A. M. Friedrichs, Raymond G. Najjar, Maria Herrmann, Zihao Bian, Gopal Bhatt, Pierre St-Laurent, Hanqin Tian, and Gary Shenk
EGUsphere, https://doi.org/10.5194/egusphere-2022-1028, https://doi.org/10.5194/egusphere-2022-1028, 2022
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Climate impacts are essential for environmental managers to consider when implementing nutrient reduction plans designed to reduce hypoxia. This work highlights relative sources of uncertainty in modeling regional climate impacts on the Chesapeake Bay watershed and consequent declines in Bay oxygen levels. The results demonstrate that planned water quality improvement goals are capable of reducing hypoxia levels by half, offsetting climate-driven impacts to terrestrial runoff.
Le Zhang and Z. George Xue
Biogeosciences, 19, 4589–4618, https://doi.org/10.5194/bg-19-4589-2022, https://doi.org/10.5194/bg-19-4589-2022, 2022
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We adopt a high-resolution carbon model for the Gulf of Mexico (GoM) and calculate the decadal trends of important carbon system variables in the GoM from 2001 to 2019. The GoM surface CO2 values experienced a steady increase over the past 2 decades, and the ocean surface pH is declining. Although carbonate saturation rates remain supersaturated with aragonite, they show a slightly decreasing trend. The northern GoM is a stronger carbon sink than we thought.
Michael M. Whitney
Biogeosciences, 19, 4479–4497, https://doi.org/10.5194/bg-19-4479-2022, https://doi.org/10.5194/bg-19-4479-2022, 2022
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Coastal hypoxia is a major environmental problem of increasing severity. The 21st-century projections analyzed indicate global coastal waters will warm and experience rapid declines in oxygen. The forecasted median coastal trends for increasing sea surface temperature and decreasing oxygen capacity are 48 % and 18 % faster than the rates observed over the last 4 decades. Existing hypoxic areas are expected to worsen, and new hypoxic areas likely will emerge under these warming-related pressures.
Bryce Van Dam, Nele Lehmann, Mary A. Zeller, Andreas Neumann, Daniel Pröfrock, Marko Lipka, Helmuth Thomas, and Michael Ernst Böttcher
Biogeosciences, 19, 3775–3789, https://doi.org/10.5194/bg-19-3775-2022, https://doi.org/10.5194/bg-19-3775-2022, 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 bioirrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from −35 µmol m−2 h−1 (uptake) to 53 µmol m−2 h−1 (release). We attribute this to low net denitrification, carbonate mineral (re-)precipitation, and sulfide (re-)oxidation.
Jiaying Abby Guo, Robert Strzepek, Anusuya Willis, Aaron Ferderer, and Lennart Thomas Bach
Biogeosciences, 19, 3683–3697, https://doi.org/10.5194/bg-19-3683-2022, https://doi.org/10.5194/bg-19-3683-2022, 2022
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Ocean alkalinity enhancement is a CO2 removal method with significant potential, but it can lead to a perturbation of the ocean with trace metals such as nickel. This study tested the effect of increasing nickel concentrations on phytoplankton growth and photosynthesis. We found that the response to nickel varied across the 11 phytoplankton species tested here, but the majority were rather insensitive. We note, however, that responses may be different under other experimental conditions.
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.
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.
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.
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.
Karl Michael Attard, Anna Lyssenko, and Iván Franco Rodil
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-119, https://doi.org/10.5194/bg-2022-119, 2022
Revised manuscript accepted for BG
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Aquatic plants produce a large amount of organic matter through photosynthesis that, following seasonal decay or storms, is deposited on the seafloor. In this study, we show that plant detritus can trigger low oxygen conditions (hypoxia) in shallow coastal waters, making conditions challenging for most marine animals. We propose that the occurrence of hypoxia may be underestimated because measurements typically do not consider the region closest to the seafloor, where detritus accumulates.
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.
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 %.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Puthenveettil Narayana Menon Vinayachandran, Yukio Masumoto, Michael J. Roberts, Jenny A. Huggett, Issufo Halo, Abhisek Chatterjee, Prakash Amol, Garuda V. M. Gupta, Arvind Singh, Arnab Mukherjee, Satya Prakash, Lynnath E. Beckley, Eric Jorden Raes, and Raleigh Hood
Biogeosciences, 18, 5967–6029, https://doi.org/10.5194/bg-18-5967-2021, https://doi.org/10.5194/bg-18-5967-2021, 2021
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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Cited articles
Alderkamp, A. C., Mills, M. M., van Dijken, G. L., Laan, P., Thuróczy,
C. E., Gerringa, L. J. A., de Baar, H. J. W., Payne, C. D., Visser, R. J.
W., Buma, A. G. J., and Arrigo, K. R.: Iron from melting glaciers fuels
phytoplankton blooms in the Amundsen Sea (Southern Ocean): Phytoplankton
characteristics and productivity, Deep-Sea Res. Pt. II,
71–76, 32–48, https://doi.org/10.1016/j.dsr2.2012.03.005, 2012.
Annett, A. L., Skiba, M., Henley, S. F., Venables, H. J., Meredith, M. P.,
Statham, P. J., and Ganeshram, R. S.: Comparative roles of upwelling and
glacial iron sources in Ryder Bay, coastal western Antarctic Peninsula, Mar.
Chem., 76, 21–33, https://doi.org/10.1016/j.marchem.2015.06.017, 2015.
Annett, A. L., Fitzsimmons, J. N., Séguret, M. J. M., Lagerström,
M., Meredith, M. P., Schofield, O., and Sherrell, R. M.: Controls on
dissolved and particulate iron distributions in surface waters of the
Western Antarctic Peninsula shelf, Mar. Chem., 196, 81–97,
https://doi.org/10.1016/j.marchem.2017.06.004, 2017.
Ardelan, M. V, Holm-Hansen, O., Hewes, C. D., Reiss, C. S., Silva, N. S., Dulaiova, H., Steinnes, E., and Sakshaug, E.: Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean, Biogeosciences, 7, 11–25, https://doi.org/10.5194/bg-7-11-2010, 2010.
Ardiningsih, I., Seyitmuhammedov, K., Sander, S. G., Stirling, C. H., Reichart, G.-J., Arrigo, K. R., Gerringa, L. J. A., and Middag, R.: Fe-binding organic ligands in coastal and frontal regions of the western Antarctic Peninsula, Biogeosciences, 18, 4587–4601, https://doi.org/10.5194/bg-18-4587-2021, 2021.
Armstrong, P. B., Lyons, W. B., and Gaudette, H. E.: Application of
Formaldoxime Colorimetric Method for the Determination of Manganese in the
Pore Water of Anoxic Estuarine Sediments, Estuaries, 2, 198–201,
https://doi.org/10.2307/1351736, 1979.
Bintanja, R., Severijns, C., Haarsma, R., and Hazeleger, W.: The future of
Antarctica's surface winds simulated by a high-resolution global climate
model: 1. Model description and validation, J. Geophys. Res.-Atmos.,
119, 7136–7159, https://doi.org/10.1002/2013JD020847, 2014.
Boudreau, B. P.: The diffusive tortuosity of fine-grained unlithified
sediments, Geochim. Cosmochim. Ac., 60, 3139–3142,
https://doi.org/10.1016/0016-7037(96)00158-5, 1996.
Bown, J., van Haren, H., Meredith, M. P., Venables, H. J., Laan, P.,
Brearley, J. A., and de Baar, H. J. W.: Evidences of strong sources of DFe
and DMn in Ryder Bay, Western Antarctic Peninsula, Philos. Trans. A, 376, 20170172, https://doi.org/10.1098/rsta.2017.0172, 2018.
Boyd, P. W., Claustre, H., Levy, M., Siegel, D. A., and Weber, T.:
Multi-faceted particle pumps drive carbon sequestration in the ocean,
Nature, 568, 327–335, https://doi.org/10.1038/s41586-019-1098-2, 2019.
Boyle, E. A., Edmond, J. M., and Sholkovitz, E. R.: The mechanism of iron
removal in estuaries, Geochim. Cosmochim. Ac., 41, 1313–1324,
https://doi.org/10.1016/0016-7037(77)90075-8, 1977.
Brendel, P. J. and Luther, G. W.: Development of a Gold Amalgam Voltammetric
Microelectrode for the Determination of Dissolved Fe, Mn, O2, and S(-II) in
Porewaters of Marine and Freshwater Sediments, Environ. Sci. Technol., 29, 751–761,
https://doi.org/10.1021/es00003a024, 1995.
Brinkerhoff, D., Truffer, M., and Aschwanden, A.: Sediment transport drives
tidewater glacier periodicity, Nat. Commun., 8, 90,
https://doi.org/10.1038/s41467-017-00095-5, 2017.
Browning, T. J., Achterberg, E. P., Engel, A., and Mawji, E.: Manganese
co-limitation of phytoplankton growth and major nutrient drawdown in the
Southern Ocean, Nat. Commun., 12, 884, https://doi.org/10.1038/s41467-021-21122-6,
2021.
Buck, K. N., Sohst, B., and Sedwick, P. N.: The organic complexation of
dissolved iron along the U.S. GEOTRACES (GA03) North Atlantic Section, Deep-Sea Res. Pt. II, 116, 152–165,
https://doi.org/10.1016/j.dsr2.2014.11.016, 2015.
Buck, K. N., Sedwick, P. N., Sohst, B., and Carlson, C. A.: Organic
complexation of iron in the eastern tropical South Pacific: Results from US
GEOTRACES Eastern Pacific Zonal Transect (GEOTRACES cruise GP16), Mar.
Chem., 201, 229–241, https://doi.org/10.1016/j.marchem.2017.11.007,
2018.
Burdige, D. J. and Komada, T.: Iron redox cycling, sediment resuspension and
the role of sediments in low oxygen environments as sources of iron to the
water column, Mar. Chem., 223, 103793, https://doi.org/10.1016/j.marchem.2020.103793, 2020.
Cape, M. R., Vernet, M., Pettit, E. C., Wellner, J., Truffer, M., Akie, G.,
Domack, E., Leventer, A., Smith, C. R., and Huber, B. A.: Circumpolar Deep
Water Impacts Glacial Meltwater Export and Coastal Biogeochemical Cycling
Along the West Antarctic Peninsula, Front. Mar. Sci., 6, 144 pp., 2019.
Cook, A. J., Holland, P. R., Meredith, M. P., Murray, T., Luckman, A., and
Vaughan, D. G.: Ocean forcing of glacier retreat in the western Antarctic
Peninsula, Science, 353, 283–286,
https://doi.org/10.1126/science.aae0017, 2016.
Cowan, E. A. and Powell, R. D.: Suspended sediment transport and deposition
of cyclically interlaminated sediment in a temperate glacial fjord, Alaska,
USA, Geol. Soc. Lond. Spec. Publ., 53, 75–89,
https://doi.org/10.1144/GSL.SP.1990.053.01.04, 1990.
Cutter, G. A. and Bruland, K. W.: Rapid and noncontaminating sampling system
for trace elements in global ocean surveys, Limnol. Oceanogr. Method.,
10, 425–436, https://doi.org/10.4319/lom.2012.10.425, 2012.
Dale, A. W., Nickelsen, L., Scholz, F., Hensen, C., Oschlies, A., and
Wallmann, K.: A revised global estimate of dissolved iron fluxes from marine
sediments, Global Biogeochem. Cy., 29, 691–707,
https://doi.org/10.1002/2014GB005017, 2015.
Death, R., Wadham, J. L., Monteiro, F., Le Brocq, A. M., Tranter, M., Ridgwell, A., Dutkiewicz, S., and Raiswell, R.: Antarctic ice sheet fertilises the Southern Ocean, Biogeosciences, 11, 2635–2643, https://doi.org/10.5194/bg-11-2635-2014, 2014.
De Jong, J. T. M., Stammerjohn, S. E., Ackley, S. F., Tison, J.-L.,
Mattielli, N., and Schoemann, V.: Sources and fluxes of dissolved iron in the
Bellingshausen Sea (West Antarctica): The importance of sea ice, icebergs
and the continental margin, Mar. Chem., 177, 518–535,
https://doi.org/10.1016/j.marchem.2015.08.004, 2015.
Dierssen, H. M., Smith, R. C., and Vernet, M.: Glacial meltwater dynamics in
coastal waters west of the Antarctic peninsula, P. Natl. Acad. Sci. USA, 99, 1790–1795, https://doi.org/10.1073/pnas.032206999, 2002.
Domack, E. W. and Ishman, S.: Oceanographic and physiographic controls on
modern sedimentation within Antarctic fjords, Geol. Soc. Am. Bull., 105, 1175–1189,
1993.
Domack, E. W. and Williams, C. R.: Fine Structure and Suspended Sediment Transport in Three Antarctic Fjords [Internet], Contributions to Antarctic Research I, Antarctic Research Series, 71–89, available at: https://doi.org/10.1029/AR050p0071, 1990.
Egbert, G. D. and Erofeeva, S. Y.: Efficient Inverse Modeling of Barotropic
Ocean Tides, J. Atmos. Ocean. Technol., 19, 183–204,
https://doi.org/10.1175/1520-0426(2002)019<0183:EIMOBO>2.0.CO;2,
2002.
Eidam, E. F., Nittrouer, C. A., Lundesgaard, Homolka, K. K., and Smith, C.
R.: Variability of Sediment Accumulation Rates in an Antarctic Fjord,
Geophys. Res. Lett., 46, 13271–13280, https://doi.org/10.1029/2019GL084499, 2019.
Ekern, L.: Assessing Primary Production via nutrient deficits in Andvord
Bay, Antarctica 2015–2016, University of California, San Diego, 2017.
Fitzsimmons, J. N., Bundy, R. M., Al-Subiai, S. N., Barbeau, K. A., and
Boyle, E. A.: The composition of dissolved iron in the dusty surface ocean:
An exploration using size-fractionated iron-binding ligands, Mar. Chem., 173, 125–135,
https://doi.org/10.1016/j.marchem.2014.09.002, 2015.
Fitzsimmons, J. N., John, S. G., Marsay, C. M., Hoffman, C. L., Nicholas, S.
L., Toner, B. M., German, C. R., and Sherrell, R. M.: Iron persistence in a
distal hydrothermal plume supported by dissolved–particulate exchange, Nat.
Geosci., 10, 195–201, https://doi.org/10.1038/ngeo2900, 2017.
Gerringa, L. J. A., Laan, P., van Dijken, G. L., van Haren, H., De Baar, H.
J. W., Arrigo, K. R., and Alderkamp, A. C.: Sources of iron in the Ross Sea
polynya in early summer, Mar. Chem., 177, 447–459, 2015.
Gerringa, L. J. A., Gledhill, M., Ardiningsih, I., Muntjewerf, N., and
Laglera, L. M.: Comparing CLE-AdCSV applications using SA and TAC to
determine the Fe-binding characteristics of model ligands in seawater,
Biogeosciences, 18, 5265–5289, https://doi.org/10.5194/bg-18-5265-2021, 2021.
Gledhill, M. and Buck, K. N.: The organic complexation of iron in the marine
environment: a review, Front. Microbiol., 3, 69,
https://doi.org/10.3389/fmicb.2012.00069, 2012.
Goldberg, T., Archer, C., Vance, D., Thamdrup, B., McAnena, A., and Poulton,
S. W.: Controls on Mo isotope fractionations in a Mn-rich anoxic marine
sediment, Gullmar Fjord, Sweden, Chem. Geol., 296/297, 73–82,
https://doi.org/10.1016/j.chemgeo.2011.12.020, 2012.
Grange, L. J. and Smith, C. R.: Megafaunal communities in rapidly warming
fjords along the West Antarctic Peninsula: Hotspots of abundance and beta
diversity, PLoS One, 8, 12, https://doi.org/10.1371/journal.pone.0077917, 2013.
Hahn-Woernle, L., Powell, B., Lundesgaard, Ø., and van Wessem, M.:
Sensitivity of the summer upper ocean heat content in a Western Antarctic
Peninsula fjord, Prog. Oceanogr., 183, 102287,
https://doi.org/10.1016/j.pocean.2020.102287, 2020.
Haidvogel, D. B., Arango, H., Budgell, W. P., Cornuelle, B. D., Curchitser,
E., Di Lorenzo, E., Fennel, K., Geyer, W. R., Hermann, A. J., Lanerolle, L.,
Levin, J., McWilliams, J. C., Miller, A. J., Moore, A. M., Powell, T. M.,
Shchepetkin, A. F., Sherwood, C. R., Signell, R. P., Warner, J. C., and
Wilkin, J.: Ocean forecasting in terrain-following coordinates: Formulation
and skill assessment of the Regional Ocean Modeling System, J. Comput.
Phys., 227, 3595–3624, https://doi.org/10.1016/j.jcp.2007.06.016,
2008.
Halbach, L., Vihtakari, M., Duarte, P., Everett, A., Granskog, M. A., Hop,
H., Kauko, H. M., Kristiansen, S., Myhre, P. I., Pavlov, A. K., Pramanik,
A., Tatarek, A., Torsvik, T., Wiktor, J. M., Wold, A., Wulff, A., Steen, H.,
and Assmy, P.: Tidewater Glaciers and Bedrock Characteristics Control the
Phytoplankton Growth Environment in a Fjord in the Arctic , Front. Mar. Sci., 6, 254, https://doi.org/10.3389/fmars.2019.00254, 2019.
Hatta, M., Measures, C. I., Selph, K. E., Zhou, M., and Hiscock, W. T.: Iron fluxes from the shelf regions near the South Shetland Islands in the Drake Passage during the austral-winter 2006, Deep-Sea Res. Pt. II, 90, 89–101, https://doi.org/10.1016/j.dsr2.2012.11.003, 2013.
Hawkings, J. R., Wadham, J. L., Tranter, M., Raiswell, R., Benning, L. G.,
Statham, P. J., Tedstone, A., Nienow, P., Lee, K., and Telling, J.: Ice
sheets as a significant source of highly reactive nanoparticulate iron to
the oceans., Nat. Commun., 5, 3929, https://doi.org/10.1038/ncomms4929, 2014.
Hawkings, J. R., Hatton, J. E., Hendry, K. R., de Souza, G. F., Wadham, J.
L., Ivanovic, R., Kohler, T. J., Stibal, M., Beaton, A., Lamarche-Gagnon,
G., Tedstone, A., Hain, M. P., Bagshaw, E., Pike, J., and Tranter, M.: The
silicon cycle impacted by past ice sheets, Nat. Commun., 9, 3210,
https://doi.org/10.1038/s41467-018-05689-1, 2018.
Hawkings, J. R., Skidmore, M. L., Wadham, J. L., Priscu, J. C., Morton, P.
L., Hatton, J. E., Gardner, C. B., Kohler, T. J., Stibal, M., Bagshaw, E.
A., Steigmeyer, A., Barker, J., Dore, J. E., Lyons, W. B., Tranter, M., and
Spencer, R. G. M.: Enhanced trace element mobilization by Earth's ice
sheets, P. Natl. Acad. Sci. USA, 117, 31648–31659,
https://doi.org/10.1073/pnas.2014378117, 2020.
Henkel, S., Kasten, S., Hartmann, J. F., Silva-Busso, A., and Staubwasser, M.: Iron cycling and stable Fe isotope fractionation in Antarctic shelf sediments, King George Island, Geochim. Cosmochim. Ac., 237, 320–338, https://doi.org/10.1016/j.gca.2018.06.042, 2018.
Henley, S. F., Cavan, E. L., Fawcett, S. E., Kerr, R., Monteiro, T.,
Sherrell, R. M., Bowie, A. R., Boyd, P. W., Barnes, D. K. A., Schloss, I.
R., Marshall, T., Flynn, R., and Smith, S.: Changing Biogeochemistry of the
Southern Ocean and Its Ecosystem Implications, Front. Mar. Sci., 7, 581, https://doi.org/10.3389/fmars.2020.00581, 2020.
Hopwood, M. J., Cantoni, C., Clarke, J. S., Cozzi, S., and Achterberg, E. P.: The heterogeneous nature of Fe delivery from melting icebergs, Geochem. Perspect. Lett., 3, 200–209, https://doi.org/10.7185/geochemlet.1723, 2017.
Hodson, A., Nowak, A., Sabacka, M., Jungblut, A., Navarro, F., Pearce, D.,
Ávila-Jiménez, M. L., Convey, P., and Vieira, G.: Climatically
sensitive transfer of iron to maritime Antarctic ecosystems by surface
runoff, Nat. Commun., 8, 14499, https://doi.org/10.1038/ncomms14499, 2017.
Hogle, S. L., Bundy, R. M., Blanton, J. M., Allen, E. E., and Barbeau, K. A.:
Copiotrophic marine bacteria are associated with strong iron-binding ligand
production during phytoplankton blooms, Limnol. Oceanogr. Lett., 1,
36–43, https://doi.org/10.1002/lol2.10026, 2016.
Holding, J. M., Markager, S., Juul-Pedersen, T., Paulsen, M. L., Møller,
E. F., Meire, L., and Sejr, M. K.: Seasonal and spatial patterns of primary
production in a high-latitude fjord affected by Greenland Ice Sheet run-off,
Biogeosciences, 16, 3777–3792, https://doi.org/10.5194/bg-16-3777-2019, 2019.
Hopwood, M. J., Bacon, S., Arendt, K., Connelly, D. P., and Statham, P. J.:
Glacial meltwater from Greenland is not likely to be an important source of
Fe to the North Atlantic, Biogeochemistry, 124, 1–11,
https://doi.org/10.1007/s10533-015-0091-6, 2015.
Hopwood, M. J., Connelly, D. P., Arendt, K. E., Juul-Pedersen, T.,
Stinchcombe, M., Meire, L., Esposito, M., and Krishna, R.: Seasonal changes
in Fe along a glaciated Greenlandic fjord, Front. Earth Sci. , 4,
1–13, https://doi.org/10.3389/feart.2016.00015, 2016.
Hopwood, M. J., Carroll, D., Höfer, J., Achterberg, E. P., Meire, L., Le
Moigne, F. A. C., Bach, L. T., Eich, C., Sutherland, D. A., and González,
H. E.: Highly variable iron content modulates iceberg-ocean fertilisation
and potential carbon export, Nat. Commun., 10, 5261,
https://doi.org/10.1038/s41467-019-13231-0, 2019.
Jack Pan, B., Vernet, M., Reynolds, R. A., and Greg Mitchell, B.: The optical
and biological properties of glacial meltwater in an Antarctic fjord, PLoS
One, 14, e0211107, https://doi.org/10.1371/journal.pone.0211107, 2019.
Jackson, R. H., Straneo, F., and Sutherland, D. A.: Externally forced
fluctuations in ocean temperature at Greenland glaciers in
non-summer months, Nat. Geosci., 7, 503–508, https://doi.org/10.1038/ngeo2186, 2014.
Kanna, N., Sugiyama, S., Fukamachi, Y., Nomura, D., and Nishioka, J.: Iron
Supply by Subglacial Discharge Into a Fjord Near the Front of a
Marine-Terminating Glacier in Northwestern Greenland, Global Biogeochem.
Cy., 34, e2020GB006567, https://doi.org/10.1029/2020GB006567,
2020.
King, A. L. and Barbeau, K. A.: Dissolved iron and macronutrient
distributions in the southern California Current System, J. Geophys. Res.
Ocean., 116, C03018, https://doi.org/10.1029/2010JC006324, 2011.
Komada, T., Burdige, D. J., Magen, C., Li, H.-L., and Chanton, J.: Recycling of Organic Matter in the Sediments of Santa Monica Basin, California Borderland, Aquat. Geochem., 22, 593–618, https://doi.org/10.1007/s10498-016-9308-0, 2016.
Krisch, S., Hopwood, M. J., Schaffer, J., Al-Hashem, A., Höfer, J.,
Rutgers van der Loeff, M. M., Conway, T. M., Summers, B. A., Lodeiro, P.,
Ardiningsih, I., Steffens, T., and Achterberg, E. P.: The 79∘N
Glacier cavity modulates subglacial iron export to the NE Greenland Shelf,
Nat. Commun., 12, 3030, https://doi.org/10.1038/s41467-021-23093-0, 2021.
Kryc, K. A., Murray, R. W., and Murray, D. W.: Al-to-oxide and Ti-to-organic
linkages in biogenic sediment: relationships to paleo-export production and
bulk Al
Lagerström, M. E., Field, M. P., Séguret, M., Fischer, L., Hann, S.,
and Sherrell, R. M.: Automated on-line flow-injection ICP-MS determination
of trace metals (Mn, Fe, Co, Ni, Cu and Zn) in open ocean seawater:
Application to the GEOTRACES program, Mar. Chem., 155, 71–80,
https://doi.org/10.1016/j.marchem.2013.06.001, 2013.
Lannuzel, D., Grotti, M., Abelmoschi, M. L., and van der Merwe, P.: Organic
ligands control the concentrations of dissolved iron in Antarctic sea ice,
Mar. Chem., 174, 120–130,
https://doi.org/10.1016/j.marchem.2015.05.005, 2015.
Laufer-Meiser, K., Michaud, A. B., Maisch, M., Byrne, J. M., Kappler, A.,
Patterson, M. O., Røy, H., and Jørgensen, B. B.: Potentially
bioavailable iron produced through benthic cycling in glaciated Arctic
fjords of Svalbard, Nat. Commun., 12, 1349,
https://doi.org/10.1038/s41467-021-21558-w, 2021.
Li, M., Toner, B. M., Baker, B. J., Breier, J. A., Sheik, C. S., and Dick, G.
J.: Microbial iron uptake as a mechanism for dispersing iron from deep-sea
hydrothermal vents, Nat. Commun., 5, 3192, https://doi.org/10.1038/ncomms4192, 2014.
Lippiatt, S. M., Lohan, M. C., and Bruland, K. W.: The distribution of
reactive iron in northern Gulf of Alaska coastal waters, Mar. Chem., 121, 187–199,
https://doi.org/10.1016/j.marchem.2010.04.007, 2010.
Lohan, M. C., Aguilar-Islas, A. M., and Bruland, K. W.: Direct determination
of iron in acidified (pH 1.7) seawater samples by flow injection analysis
with catalytic spectrophotometric detection: Application and
intercomparison, Limnol. Oceanogr. Method., 4, 164–171,
https://doi.org/10.4319/lom.2006.4.164, 2006.
Lundesgaard, Ø., Powell, B., Merrifield, M., Hahn-Woernle, L., and Winsor,
P.: Response of an antarctic Peninsula fjord to summer Katabatic wind
events, J. Phys. Oceanogr., 49, 1485–1502, https://doi.org/10.1175/JPO-D-18-0119.1, 2019.
Lundesgaard, Ø., Winsor, P., Truffer, M., Merrifield, M., Powell, B.,
Statscewich, H., Eidam, E., and Smith, C. R.: Hydrography and energetics of a
cold subpolar fjord: Andvord Bay, western Antarctic Peninsula, Prog.
Oceanogr., 181, 102224, https://doi.org/10.1016/j.pocean.2019.102224, 2020.
Luther, G. W., Glazer, B. T., Ma, S., Trouwborst, R. E., Moore, T. S.,
Metzger, E., Kraiya, C., Waite, T. J., Druschel, G., Sundby, B., Taillefert,
M., Nuzzio, D. B., Shank, T. M., Lewis, B. L., and Brendel, P. J.: Use of
voltammetric solid-state (micro)electrodes for studying biogeochemical
processes: Laboratory measurements to real time measurements with an in situ
electrochemical analyzer (ISEA), Mar. Chem., 108, 221–235,
https://doi.org/10.1016/j.marchem.2007.03.002, 2008.
Luther III, G. W., Brendel, P. J., Lewis, B. L., Sundby, B., Lefrançois,
L., Silverberg, N., and Nuzzio, D. B.: Simultaneous measurement of O2, Mn,
Fe, I-, and S(–II) in marine pore waters with a solid-state voltammetric
microelectrode, Limnol. Oceanogr., 43, 325–333,
https://doi.org/10.4319/lo.1998.43.2.0325, 1998.
Marsay, C. M., Sedwick, P. N., Dinniman, M. S., Barrett, P. M., Mack, S. L.,
and McGillicuddy, D. J.: Estimating the benthic efflux of dissolved iron on
the Ross Sea continental shelf, Geophys. Res. Lett., 41, 7576–7583,
https://doi.org/10.1002/2014GL061684, 2014.
Martin, J. H., Gordon, R. M., and Fitzwater, S. E.: Iron in Antarctic waters, Nature, 345, 156–158, https://doi.org/10.1038/345156a0, 1990.
Meire, L., Mortensen, J., Meire, P., Juul-Pedersen, T., Sejr, M. K.,
Rysgaard, S., Nygaard, R., Huybrechts, P., and Meysman, F. J. R.:
Marine-terminating glaciers sustain high productivity in Greenland fjords,
Glob. Change Biol., 23, 5344–5357, https://doi.org/10.1111/gcb.13801, 2017.
Meredith, M. P., Stammerjohn, S. E., Venables, H. J., Ducklow, H. W.,
Martinson, D. G., Iannuzzi, R. A., Leng, M. J., van Wessem, J. M., Reijmer,
C. H., and Barrand, N. E.: Changing distributions of sea ice melt and
meteoric water west of the Antarctic Peninsula, Deep-Sea Res. Pt. II, 139, 40–57,
https://doi.org/10.1016/j.dsr2.2016.04.019, 2017.
Mikucki, J. A., Pearson, A., Johnston, D. T., Turchyn, A. V, Farquhar, J.,
Schrag, D. P., Anbar, A. D., Priscu, J. C., and Lee, P. A.: A Contemporary
Microbially Maintained Subglacial Ferrous “Ocean”, Science, 324, 397–400, https://doi.org/10.1126/science.1167350, 2009.
Moffat, C., Beardsley, R. C., Owens, B., and van Lipzig, N.: A first
description of the Antarctic Peninsula Coastal Current, Deep-Sea Res. Pt.
II, 55, 277–293,
https://doi.org/10.1016/j.dsr2.2007.10.003, 2008.
Mouginot, J., Rignot, E., Bjørk, A. A., van den Broeke, M., Millan, R.,
Morlighem, M., Noël, B., Scheuchl, B.,, and Wood, M.: Forty-six years of
Greenland Ice Sheet mass balance from 1972 to 2018, P. Natl. Acad. Sci. USA,
116, 9239–9244, https://doi.org/10.1073/pnas.1904242116, 2019.
Ng, H. C., Cassarino, L., Pickering, R. A., Woodward, E. M. S., Hammond, S.
J., and Hendry, K. R.: Sediment efflux of silicon on the Greenland margin and
implications for the marine silicon cycle, Earth Planet. Sc. Lett., 529,
115877, https://doi.org/10.1016/j.epsl.2019.115877, 2020.
Oliver, H., St-Laurent, P., Sherrell, R. M., and Yager, P. L.: Modeling Iron
and Light Controls on the Summer Phaeocystis antarctica Bloom in the
Amundsen Sea Polynya, Global Biogeochem. Cy., 33, 570–596,
https://doi.org/10.1029/2018GB006168, 2019.
Omanović, D., Garnier, C., and Pižeta, I.: ProMCC: An all-in-one tool
for trace metal complexation studies, Mar. Chem., 173, 25–39,
https://doi.org/10.1016/j.marchem.2014.10.011, 2015.
Pan, B. J., Vernet, M., Manck, L., Forsch, K., Ekern, L., Mascioni, M.,
Barbeau, K. A., Almandoz, G. O., and Orona, A. J.: Environmental drivers of
phytoplankton taxonomic composition in an Antarctic fjord, Prog. Oceanogr., 183, 102295,
https://doi.org/10.1016/j.pocean.2020.102295, 2020.
Person, R., Aumont, O., Madec, G., Vancoppenolle, M., Bopp, L., and Merino, N.: Sensitivity of ocean biogeochemistry to the iron supply from the Antarctic Ice Sheet explored with a biogeochemical model, Biogeosciences, 16, 3583–3603, https://doi.org/10.5194/bg-16-3583-2019, 2019.
Poulton, S. W. and Canfield, D. E.: Development of a sequential extraction
procedure for iron: implications for iron partitioning in continentally
derived particulates, Chem. Geol., 214, 209–221,
https://doi.org/10.1016/j.chemgeo.2004.09.003, 2005.
Pritchard, H. D. and Vaughan, D. G.: Widespread acceleration of tidewater
glaciers on the Antarctic Peninsula, J. Geophys. Res. Earth Surf., 112, F03S29,
https://doi.org/10.1029/2006JF000597, 2007.
Raiswell, R. and Canfield, D. E.: The Iron Biogeochemical Cycle Past and
Present, Geochem. Perspect., 1, 1–220, https://doi.org/10.7185/geochempersp.1.1,
2012.
Raiswell, R., Hawkings, J., Elsenousy, A., Death, R., Tranter, M., and
Wadham, J.: Iron in Glacial Systems: Speciation, Reactivity, Freezing
Behavior, and Alteration During Transport, Front. Earth Sci., 6, 222,
https://doi.org/10.3389/feart.2018.00222, 2018.
Rignot, E., Jacobs, S., Mouginot, J., and Scheuchl, B.: Ice-Shelf Melting
Around Antarctica, Science, 341, 266–270,
https://doi.org/10.1126/science.1235798, 2013.
Rudnick, R. L. and Gao, S.: Composition of the Continental Crust, in:
Treatise on Geochemistry, 2nd Edn., Elsevier Ltd., Kidlington, Oxford UK, 2013.
Rye, C. D., Marshall, J., Kelley, M., Russell, G., Nazarenko, L. S., Kostov, Y., Schmidt, G. A., and Hansen, J.: Antarctic Glacial Melt as a Driver of Recent Southern Ocean Climate Trends, Geophys. Res. Lett., 47, e2019GL086892, https://doi.org/10.1029/2019GL086892, 2020.
Sañudo-Wilhelmy, S. A., Olsen, K. A., Scelfo, J. M., Foster, T. D., and Flegal, A. R.: Trace metal distributions off the Antarctic Peninsula in the Weddell Sea, Mar. Chem., 77, 157–170, https://doi.org/10.1016/S0304-4203(01)00084-6, 2002.
Schlitzer, R.: Interactive analysis and visualization of geoscience data with Ocean Data View, Comput. Geosci., 28, 1211–1218, https://doi.org/10.1016/S0098-3004(02)00040-7, 2002.
Schlosser, C., Schmidt, K., Aquilina, A., Homoky, W. B., Castrillejo, M.,
Mills, R. A., Patey, M. D., Fielding, S., Atkinson, A., and Achterberg, E.
P.: Mechanisms of dissolved and labile particulate iron supply to shelf
waters and phytoplankton blooms off South Georgia, Southern Ocean,
Biogeosciences, 15, 4973–4993, https://doi.org/10.5194/bg-15-4973-2018, 2018.
Schodlok, M. P., Menemenlis, D., and Rignot, E. J.: Ice shelf basal melt
rates around Antarctica from simulations and observations, J. Geophys. Res. Ocean., 121, 1085–1109, https://doi.org/10.1002/2015JC011117, 2016.
Schroth, A. W., Crusius, J., Hoyer, I., and Campbell, R.: Estuarine removal
of glacial iron and implications for iron fluxes to the ocean, Geophys. Res.
Lett., 41, 3951–3958, https://doi.org/10.1002/2014GL060199, 2014.
Severmann, S., McManus, J., Berelson, W. M., and Hammond, D. E.: The
continental shelf benthic iron flux and its isotope composition, Geochim.
Cosmochim. Ac., 74, 3984–4004,
https://doi.org/10.1016/j.gca.2010.04.022, 2010.
Sherrell, R. M., Lagerström, M. E., Forsch, K. O., Stammerjohn, S. E.,
and Yager, P. L.: Dynamics of dissolved iron and other bioactive trace
metals (Mn, Ni, Cu, Zn) in the Amundsen Sea Polynya, Antarctica, Elem. Sci.
Anthr., 3, 000071, https://doi.org/10.12952/journal.elementa.000071, 2015.
Sherrell, R. M., Annett, A. L., Fitzsimmons, J. N., Roccanova, V. J., and
Meredith, M. P.: A “shallow bathtub ring” of local sedimentary iron input
maintains the Palmer Deep biological hotspot on the West Antarctic Peninsula
shelf, Philos. T. R. Soc. A, 376, 20170171,
https://doi.org/10.1098/rsta.2017.0171, 2018.
Smith, B., Fricker, H. A., Gardner, A. S., Medley, B., Nilsson, J., Paolo,
F. S., Holschuh, N., Adusumilli, S., Brunt, K., Csatho, B., Harbeck, K.,
Markus, T., Neumann, T., Siegfried, M. R., and Zwally, H. J.: Pervasive ice
sheet mass loss reflects competing ocean and atmosphere processes, Science, 368, eaaz5845, https://doi.org/10.1126/science.aaz5845, 2020.
St-Laurent, P., Yager, P. L., Sherrell, R. M., Stammerjohn, S. E., and
Dinniman, M. S.: Pathways and supply of dissolved iron in the Amundsen Sea
(Antarctica), J. Geophys. Res. Ocean., 122, 7135–7162,
https://doi.org/10.1002/2017JC013162, 2017.
St-Laurent, P., Yager, P. L., Sherrell, R. M., Oliver, H., Dinniman, M. S.,
and Stammerjohn, S. E.: Modeling the Seasonal Cycle of Iron and Carbon
Fluxes in the Amundsen Sea Polynya, Antarctica, J. Geophys. Res. Ocean., 124, 1544–1565,
https://doi.org/10.1029/2018JC014773, 2019.
Straneo, F. and Cenedese, C.: The Dynamics of Greenland's Glacial Fjords and
Their Role in Climate, Ann. Rev. Mar. Sci., 7, 89–112,
https://doi.org/10.1146/annurev-marine-010213-135133, 2015.
Tagliabue, A., Bowie, A. R., DeVries, T., Ellwood, M. J., Landing, W. M.,
Milne, A., Ohnemus, D. C., Twining, B. S., and Boyd, P. W.: The interplay
between regeneration and scavenging fluxes drives ocean iron cycling, Nat.
Commun., 10, 4960, https://doi.org/10.1038/s41467-019-12775-5, 2019.
Taylor, R. S., DeMaster, D. J., and Burdige, D. J.: Assessing the
distribution of labile organic carbon from diverse depositional environments
on the West Antarctic Peninsula shelf, Deep-Sea Res. Pt. I, 156, 103166, https://doi.org/10.1016/j.dsr.2019.103166, 2020.
Taylor, S. R. and McLennan, S. M.: The geochemical evolution of the
continental crust, Rev. Geophys., 33, 241–265, https://doi.org/10.1029/95RG00262,
1995.
Thuróczy, C.-E., Gerringa, L. J. A., Klunder, M., Laan, P., Le Guitton,
M., and de Baar, H. J. W.: Distinct trends in the speciation of iron between
the shallow shelf seas and the deep basins of the Arctic Ocean, J. Geophys.
Res. Ocean., 116, C10009, https://doi.org/10.1029/2010JC006835, 2011.
Thuróczy, C. E., Alderkamp, A. C., Laan, P., Gerringa, L. J. A., Mills,
M. M., Van Dijken, G. L., De Baar, H. J. W., and Arrigo, K. R.: Key role of
organic complexation of iron in sustaining phytoplankton blooms in the Pine
Island and Amundsen Polynyas (Southern Ocean), Deep-Sea Res. Pt. II, 71–76, 49–60, https://doi.org/10.1016/j.dsr2.2012.03.009, 2012.
Twining, B. S., Baines, S. B., Fisher, N. S., and Landry, M. R.: Cellular
iron contents of plankton during the Southern Ocean Iron Experiment (SOFeX),
Deep-Sea Res. Pt. I, 51, 1827–1850, https://doi.org/10.1016/j.dsr.2004.08.007, 2004.
van Wessem, J. M., Reijmer, C. H., Lenaerts, J. T. M., van de Berg, W. J., van den Broeke, M. R., and van Meijgaard, E.: Updated cloud physics in a regional atmospheric climate model improves the modelled surface energy balance of Antarctica, The Cryosphere, 8, 125–135, https://doi.org/10.5194/tc-8-125-2014, 2014.
Vernet, M., Martinson, D., Iannuzzi, R., Stammerjohn, S., Kozlowski, W.,
Sines, K., Smith, R., and Garibotti, I.: Primary production within the
sea-ice zone west of the Antarctic Peninsula: I – Sea ice, summer mixed layer,
and irradiance, Deep-Sea Res. Pt. II, 55, 2068–2085,
https://doi.org/10.1016/j.dsr2.2008.05.021, 2008.
Vernet, M., Forsch, K., Manck, L., and Pan, B.: FjordEco Phytoplankton Ecology Dataset in Andvord Bay, US Antarctic Program (USAP) Data Center [data set], https://doi.org/10.15784/601158, 2019.
Wagener, P., Schwenke, A., and Barcikowski, S.: How Citrate Ligands Affect
Nanoparticle Adsorption to Microparticle Supports, Langmuir, 28,
6132–6140, https://doi.org/10.1021/la204839m, 2012.
Wu, J., Boyle, E., Sunda, W., and Wen, L.-S.: Soluble and colloidal iron in
the oligotrophic North Atlantic and North Pacific, Science,
293, 847–849, 2001.
Wu, M., McCain, J. S. P., Rowland, E., Middag, R., Sandgren, M., Allen, A.
E., and Bertrand, E. M.: Manganese and iron deficiency in Southern Ocean
Phaeocystis antarctica populations revealed through taxon-specific protein
indicators, Nat. Commun., 10, 3582, https://doi.org/10.1038/s41467-019-11426-z, 2019.
Zhang, R., John, S. G., Zhang, J., Ren, J., Wu, Y., Zhu, Z., Liu, S., Zhu,
X., Marsay, C. M., and Wenger, F.: Transport and reaction of iron and iron
stable isotopes in glacial meltwaters on Svalbard near Kongsfjorden: From
rivers to estuary to ocean, Earth Planet. Sc. Lett., 424, 201–211, 2015.
Ziegler, A. F., Smith, C. R., Edwards, K. F., and Maria, V.: Glacial
dropstones: islands enhancing seafloor species richness of benthic megafauna
in West Antarctic Peninsula fjords, Mar. Ecol. Prog. Ser., 583, 1–14,
2017.
Ziegler, A. F., Cape, M., Lundesgaard, Ø., and Smith, C. R.: Intense
deposition and rapid processing of seafloor phytodetritus in a glaciomarine
fjord, Andvord Bay (Antarctica), Prog. Oceanogr., 187, 102413,
https://doi.org/10.1016/j.pocean.2020.102413, 2020.
Short summary
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.
We show that for an unperturbed cold western Antarctic Peninsula fjord, the seasonality of iron...
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