Articles | Volume 18, issue 3
https://doi.org/10.5194/bg-18-897-2021
© 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-18-897-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Feb 2021
Research article |
| 08 Feb 2021
| 08 Feb 2021
Cross-basin differences in the nutrient assimilation characteristics of induced phytoplankton blooms in the subtropical Pacific waters
Fuminori Hashihama
CORRESPONDING AUTHOR
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan
Institute for Marine and Antarctic Studies, University of Tasmania,
Hobart TAS 7004, Australia
Hiroaki Saito
Atmosphere and Ocean Research Institute, The University of Tokyo,
Chiba 277-8564, Japan
Taketoshi Kodama
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kanagawa 236-8648, Japan
Saori Yasui-Tamura
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan
Jota Kanda
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan
Iwao Tanita
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Okinawa 907-0451, Japan
Hiroshi Ogawa
Atmosphere and Ocean Research Institute, The University of Tokyo,
Chiba 277-8564, Japan
E. Malcolm S. Woodward
Plymouth Marine Laboratory, Prospect Place, the Hoe, Plymouth PL1 3DH, UK
Philip W. Boyd
Institute for Marine and Antarctic Studies, University of Tasmania,
Hobart TAS 7004, Australia
Ken Furuya
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
Graduate School of Science and Engineering, Soka University, Tokyo
192-8577, Japan
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The response of diazotrophs to nutrient amendment in the South China Sea and western North Pacific
Influence of GEOTRACES data distribution and misfit function choice on objective parameter retrieval in a marine zinc cycle model
Physiological flexibility of phytoplankton impacts modelled chlorophyll and primary production across the North Pacific Ocean
Observation-constrained estimates of the global ocean carbon sink from Earth system models
Early winter barium excess in the southern Indian Ocean as an annual remineralisation proxy (GEOTRACES GIPr07 cruise)
Controlling factors on the global distribution of a representative marine non-cyanobacterial diazotroph phylotype (Gamma A)
Summer trends and drivers of sea surface fCO2 and pH changes observed in the southern Indian Ocean over the last two decades (1998–2019)
Global nutrient cycling by commercially targeted marine fish
Major processes of the dissolved cobalt cycle in the North and equatorial Pacific Ocean
The impact of the South-East Madagascar Bloom on the oceanic CO2 sink
Nitrite regeneration in the oligotrophic Atlantic Ocean
Bridging the gaps between particulate backscattering measurements and modeled particulate organic carbon in the ocean
Biological production in two contrasted regions of the Mediterranean Sea during the oligotrophic period: an estimate based on the diel cycle of optical properties measured by BioGeoChemical-Argo profiling floats
Acidification of the Nordic Seas
Reconstruction of global surface ocean pCO2 using region-specific predictors based on a stepwise FFNN regression algorithm
Biogeochemical controls on ammonium accumulation in the surface layer of the Southern Ocean
Oxygen export to the deep ocean following Labrador Sea Water formation
N2 fixation in the Mediterranean Sea related to the composition of the diazotrophic community and impact of dust under present and future environmental conditions
Dissolution of a submarine carbonate platform by a submerged lake of acidic seawater
Seasonal flux patterns and carbon transport from low-oxygen eddies at the Cape Verde Ocean Observatory: lessons learned from a time series sediment trap study (2009–2016)
Subsurface iron accumulation and rapid aluminum removal in the Mediterranean following African dust deposition
Zoë Rebecca van Kemenade, Zeynep Erdem, Ellen Christine Hopmans, Jaap Smede Sinninghe Damsté, and Darci Rush
Biogeosciences, 21, 1517–1532, https://doi.org/10.5194/bg-21-1517-2024, https://doi.org/10.5194/bg-21-1517-2024, 2024
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The California Current system (CCS) hosts the eastern subtropical North Pacific oxygen minimum zone (ESTNP OMZ). This study shows anaerobic ammonium oxidizing (anammox) bacteria cause a loss of bioavailable nitrogen (N) in the ESTNP OMZ throughout the late Quaternary. Anammox occurred during both glacial and interglacial periods and was driven by the supply of organic matter and changes in ocean currents. These findings may have important consequences for biogeochemical models of the CCS.
Cathy Wimart-Rousseau, Tobias Steinhoff, Birgit Klein, Henry Bittig, and Arne Körtzinger
Biogeosciences, 21, 1191–1211, https://doi.org/10.5194/bg-21-1191-2024, https://doi.org/10.5194/bg-21-1191-2024, 2024
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The marine CO2 system can be measured independently and continuously by BGC-Argo floats since numerous pH sensors have been developed to suit these autonomous measurements platforms. By applying the Argo correction routines to float pH data acquired in the subpolar North Atlantic Ocean, we report the uncertainty and lack of objective criteria associated with the choice of the reference method as well the reference depth for the pH correction.
Sabine Mecking and Kyla Drushka
Biogeosciences, 21, 1117–1133, https://doi.org/10.5194/bg-21-1117-2024, https://doi.org/10.5194/bg-21-1117-2024, 2024
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This study investigates whether northeastern North Pacific oxygen changes may be caused by surface density changes in the northwest as water moves along density horizons from the surface into the subsurface ocean. A correlation is found with a lag that about matches the travel time of water from the northwest to the northeast. Salinity is the main driver causing decadal changes in surface density, whereas salinity and temperature contribute about equally to long-term declining density trends.
Takamitsu Ito, Hernan E. Garcia, Zhankun Wang, Shoshiro Minobe, Matthew C. Long, Just Cebrian, James Reagan, Tim Boyer, Christopher Paver, Courtney Bouchard, Yohei Takano, Seth Bushinsky, Ahron Cervania, and Curtis A. Deutsch
Biogeosciences, 21, 747–759, https://doi.org/10.5194/bg-21-747-2024, https://doi.org/10.5194/bg-21-747-2024, 2024
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This study aims to estimate how much oceanic oxygen has been lost and its uncertainties. One major source of uncertainty comes from the statistical gap-filling methods. Outputs from Earth system models are used to generate synthetic observations where oxygen data are extracted from the model output at the location and time of historical oceanographic cruises. Reconstructed oxygen trend is approximately two-thirds of the true trend.
Robert W. Izett, Katja Fennel, Adam C. Stoer, and David P. Nicholson
Biogeosciences, 21, 13–47, https://doi.org/10.5194/bg-21-13-2024, https://doi.org/10.5194/bg-21-13-2024, 2024
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This paper provides an overview of the capacity to expand the global coverage of marine primary production estimates using autonomous ocean-going instruments, called Biogeochemical-Argo floats. We review existing approaches to quantifying primary production using floats, provide examples of the current implementation of the methods, and offer insights into how they can be better exploited. This paper is timely, given the ongoing expansion of the Biogeochemical-Argo array.
Qian Liu, Yingjie Liu, and Xiaofeng Li
Biogeosciences, 20, 4857–4874, https://doi.org/10.5194/bg-20-4857-2023, https://doi.org/10.5194/bg-20-4857-2023, 2023
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In the Southern Ocean, abundant eddies behave opposite to our expectations. That is, anticyclonic (cyclonic) eddies are cold (warm). By investigating the variations of physical and biochemical parameters in eddies, we find that abnormal eddies have unique and significant effects on modulating the parameters. This study fills a gap in understanding the effects of abnormal eddies on physical and biochemical parameters in the Southern Ocean.
France Van Wambeke, Pascal Conan, Mireille Pujo-Pay, Vincent Taillandier, Olivier Crispi, and Elvira Pulido-Villena
EGUsphere, https://doi.org/10.5194/egusphere-2023-2578, https://doi.org/10.5194/egusphere-2023-2578, 2023
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Distribution of phosphomonoesterase (PME) and phosphodiesterase (PDE) activities over the epipelagic zone are described in the eastern Mediterranean Sea, in winter and spring. The type of concentration kinetics obtained for PDE (saturation at 50 µM, high Km, high turnovertimes) compared to those of PME (saturation at 1 µM, low Km, low turnovertimes) are discussed in regard to possible inequal distribution of PDE and PME among organic material size continuum, and accessibility to phosphodiesters.
Caroline Ulses, Claude Estournel, Patrick Marsaleix, Karline Soetaert, Marine Fourrier, Laurent Coppola, Dominique Lefèvre, Franck Touratier, Catherine Goyet, Véronique Guglielmi, Fayçal Kessouri, Pierre Testor, and Xavier Durrieu de Madron
Biogeosciences, 20, 4683–4710, https://doi.org/10.5194/bg-20-4683-2023, https://doi.org/10.5194/bg-20-4683-2023, 2023
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Deep convection plays a key role in the circulation, thermodynamics, and biogeochemical cycles in the Mediterranean Sea, considered to be a hotspot of biodiversity and climate change. In this study, we investigate the seasonal and annual budget of dissolved inorganic carbon in the deep-convection area of the northwestern Mediterranean Sea.
Daniela König and Alessandro Tagliabue
Biogeosciences, 20, 4197–4212, https://doi.org/10.5194/bg-20-4197-2023, https://doi.org/10.5194/bg-20-4197-2023, 2023
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Using model simulations, we show that natural and anthropogenic changes in the global climate leave a distinct fingerprint in the isotopic signatures of iron in the surface ocean. We find that these climate effects on iron isotopes are often caused by the redistribution of iron from different external sources to the ocean, due to changes in ocean currents, and by changes in algal growth, which take up iron. Thus, isotopes may help detect climate-induced changes in iron supply and algal uptake.
Chloé Baumas, Robin Fuchs, Marc Garel, Jean-Christophe Poggiale, Laurent Memery, Frédéric A. C. Le Moigne, and Christian Tamburini
Biogeosciences, 20, 4165–4182, https://doi.org/10.5194/bg-20-4165-2023, https://doi.org/10.5194/bg-20-4165-2023, 2023
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Through the sink of particles in the ocean, carbon (C) is exported and sequestered when reaching 1000 m. Attempts to quantify C exported vs. C consumed by heterotrophs have increased. Yet most of the conducted estimations have led to C demands several times higher than C export. The choice of parameters greatly impacts the results. As theses parameters are overlooked, non-accurate values are often used. In this study we show that C budgets can be well balanced when using appropriate values.
Anna Belcher, Sian F. Henley, Katharine Hendry, Marianne Wootton, Lisa Friberg, Ursula Dallman, Tong Wang, Christopher Coath, and Clara Manno
Biogeosciences, 20, 3573–3591, https://doi.org/10.5194/bg-20-3573-2023, https://doi.org/10.5194/bg-20-3573-2023, 2023
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The oceans play a crucial role in the uptake of atmospheric carbon dioxide, particularly the Southern Ocean. The biological pumping of carbon from the surface to the deep ocean is key to this. Using sediment trap samples from the Scotia Sea, we examine biogeochemical fluxes of carbon, nitrogen, and biogenic silica and their stable isotope compositions. We find phytoplankton community structure and physically mediated processes are important controls on particulate fluxes to the deep ocean.
Asmita Singh, Susanne Fietz, Sandy J. Thomalla, Nicolas Sanchez, Murat V. Ardelan, Sébastien Moreau, Hanna M. Kauko, Agneta Fransson, Melissa Chierici, Saumik Samanta, Thato N. Mtshali, Alakendra N. Roychoudhury, and Thomas J. Ryan-Keogh
Biogeosciences, 20, 3073–3091, https://doi.org/10.5194/bg-20-3073-2023, https://doi.org/10.5194/bg-20-3073-2023, 2023
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Despite the scarcity of iron in the Southern Ocean, seasonal blooms occur due to changes in nutrient and light availability. Surprisingly, during an autumn bloom in the Antarctic sea-ice zone, the results from incubation experiments showed no significant photophysiological response of phytoplankton to iron addition. This suggests that ambient iron concentrations were sufficient, challenging the notion of iron deficiency in the Southern Ocean through extended iron-replete post-bloom conditions.
Benoît Pasquier, Mark Holzer, Matthew A. Chamberlain, Richard J. Matear, Nathaniel L. Bindoff, and François W. Primeau
Biogeosciences, 20, 2985–3009, https://doi.org/10.5194/bg-20-2985-2023, https://doi.org/10.5194/bg-20-2985-2023, 2023
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Modeling the ocean's carbon and oxygen cycles accurately is challenging. Parameter optimization improves the fit to observed tracers but can introduce artifacts in the biological pump. Organic-matter production and subsurface remineralization rates adjust to compensate for circulation biases, changing the pathways and timescales with which nutrients return to the surface. Circulation biases can thus strongly alter the system’s response to ecological change, even when parameters are optimized.
Priyanka Banerjee
Biogeosciences, 20, 2613–2643, https://doi.org/10.5194/bg-20-2613-2023, https://doi.org/10.5194/bg-20-2613-2023, 2023
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This study shows that atmospheric deposition is the most important source of iron to the upper northern Indian Ocean for phytoplankton growth. This is followed by iron from continental-shelf sediment. Phytoplankton increase following iron addition is possible only with high background levels of nitrate. Vertical mixing is the most important physical process supplying iron to the upper ocean in this region throughout the year. The importance of ocean currents in supplying iron varies seasonally.
Iris Kriest, Julia Getzlaff, Angela Landolfi, Volkmar Sauerland, Markus Schartau, and Andreas Oschlies
Biogeosciences, 20, 2645–2669, https://doi.org/10.5194/bg-20-2645-2023, https://doi.org/10.5194/bg-20-2645-2023, 2023
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Global biogeochemical ocean models are often subjectively assessed and tuned against observations. We applied different strategies to calibrate a global model against observations. Although the calibrated models show similar tracer distributions at the surface, they differ in global biogeochemical fluxes, especially in global particle flux. Simulated global volume of oxygen minimum zones varies strongly with calibration strategy and over time, rendering its temporal extrapolation difficult.
John C. Tracey, Andrew R. Babbin, Elizabeth Wallace, Xin Sun, Katherine L. DuRussel, Claudia Frey, Donald E. Martocello III, Tyler Tamasi, Sergey Oleynik, and Bess B. Ward
Biogeosciences, 20, 2499–2523, https://doi.org/10.5194/bg-20-2499-2023, https://doi.org/10.5194/bg-20-2499-2023, 2023
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Nitrogen (N) is essential for life; thus, its availability plays a key role in determining marine productivity. Using incubations of seawater spiked with a rare form of N measurable on a mass spectrometer, we quantified microbial pathways that determine marine N availability. The results show that pathways that recycle N have higher rates than those that result in its loss from biomass and present new evidence for anaerobic nitrite oxidation, a process long thought to be strictly aerobic.
Amanda Gerotto, Hongrui Zhang, Renata Hanae Nagai, Heather M. Stoll, Rubens César Lopes Figueira, Chuanlian Liu, and Iván Hernández-Almeida
Biogeosciences, 20, 1725–1739, https://doi.org/10.5194/bg-20-1725-2023, https://doi.org/10.5194/bg-20-1725-2023, 2023
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Based on the analysis of the response of coccolithophores’ morphological attributes in a laboratory dissolution experiment and surface sediment samples from the South China Sea, we proposed that the thickness shape (ks) factor of fossil coccoliths together with the normalized ks variation, which is the ratio of the standard deviation of ks (σ) over the mean ks (σ/ks), is a robust and novel proxy to reconstruct past changes in deep ocean carbon chemistry.
Katherine E. Turner, Doug M. Smith, Anna Katavouta, and Richard G. Williams
Biogeosciences, 20, 1671–1690, https://doi.org/10.5194/bg-20-1671-2023, https://doi.org/10.5194/bg-20-1671-2023, 2023
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We present a new method for reconstructing ocean carbon using climate models and temperature and salinity observations. To test this method, we reconstruct modelled carbon using synthetic observations consistent with current sampling programmes. Sensitivity tests show skill in reconstructing carbon trends and variability within the upper 2000 m. Our results indicate that this method can be used for a new global estimate for ocean carbon content.
Nicole M. Travis, Colette L. Kelly, and Karen L. Casciotti
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-64, https://doi.org/10.5194/bg-2023-64, 2023
Revised manuscript accepted for BG
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We conducted experimental manipulations of light level on microbial communities from the primary nitrite maximum. Overall, while individual microbial processes have different directions and magnitudes in their response to increasing light, the net community response is a decline in nitrite production with increasing light. We conclude that while increased light may decrease net nitrite production, high light conditions alone do not exclude nitrification from occurring in the surface ocean.
Alexandre Mignot, Hervé Claustre, Gianpiero Cossarini, Fabrizio D'Ortenzio, Elodie Gutknecht, Julien Lamouroux, Paolo Lazzari, Coralie Perruche, Stefano Salon, Raphaëlle Sauzède, Vincent Taillandier, and Anna Teruzzi
Biogeosciences, 20, 1405–1422, https://doi.org/10.5194/bg-20-1405-2023, https://doi.org/10.5194/bg-20-1405-2023, 2023
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Numerical models of ocean biogeochemistry are becoming a major tool to detect and predict the impact of climate change on marine resources and monitor ocean health. Here, we demonstrate the use of the global array of BGC-Argo floats for the assessment of biogeochemical models. We first detail the handling of the BGC-Argo data set for model assessment purposes. We then present 23 assessment metrics to quantify the consistency of BGC model simulations with respect to BGC-Argo data.
Alban Planchat, Lester Kwiatkowski, Laurent Bopp, Olivier Torres, James R. Christian, Momme Butenschön, Tomas Lovato, Roland Séférian, Matthew A. Chamberlain, Olivier Aumont, Michio Watanabe, Akitomo Yamamoto, Andrew Yool, Tatiana Ilyina, Hiroyuki Tsujino, Kristen M. Krumhardt, Jörg Schwinger, Jerry Tjiputra, John P. Dunne, and Charles Stock
Biogeosciences, 20, 1195–1257, https://doi.org/10.5194/bg-20-1195-2023, https://doi.org/10.5194/bg-20-1195-2023, 2023
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Ocean alkalinity is critical to the uptake of atmospheric carbon and acidification in surface waters. We review the representation of alkalinity and the associated calcium carbonate cycle in Earth system models. While many parameterizations remain present in the latest generation of models, there is a general improvement in the simulated alkalinity distribution. This improvement is related to an increase in the export of biotic calcium carbonate, which closer resembles observations.
Jenny Hieronymus, Magnus Hieronymus, Matthias Gröger, Jörg Schwinger, Raffaele Bernadello, Etienne Tourigny, Valentina Sicardi, Itzel Ruvalcaba Baroni, and Klaus Wyser
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-54, https://doi.org/10.5194/bg-2023-54, 2023
Revised manuscript accepted for BG
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Changes in the seasonality of primary production has been examined using daily data from two earth system models covering the period 1750–2100. The daily data made it possible to detect shifts in the day of the year during which the net primary production reaches its peak value. It was found that the day of peak primary production occurs earlier and earlier during the 21st century and that a major change in the time series occurs in the beginning of the 21st century.
Jérôme Pinti, Tim DeVries, Tommy Norin, Camila Serra-Pompei, Roland Proud, David A. Siegel, Thomas Kiørboe, Colleen M. Petrik, Ken H. Andersen, Andrew S. Brierley, and André W. Visser
Biogeosciences, 20, 997–1009, https://doi.org/10.5194/bg-20-997-2023, https://doi.org/10.5194/bg-20-997-2023, 2023
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Large numbers of marine organisms such as zooplankton and fish perform daily vertical migration between the surface (at night) and the depths (in the daytime). This fascinating migration is important for the carbon cycle, as these organisms actively bring carbon to depths where it is stored away from the atmosphere for a long time. Here, we quantify the contributions of different animals to this carbon drawdown and storage and show that fish are important to the biological carbon pump.
Alastair J. M. Lough, Alessandro Tagliabue, Clément Demasy, Joseph A. Resing, Travis Mellett, Neil J. Wyatt, and Maeve C. Lohan
Biogeosciences, 20, 405–420, https://doi.org/10.5194/bg-20-405-2023, https://doi.org/10.5194/bg-20-405-2023, 2023
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Iron is a key nutrient for ocean primary productivity. Hydrothermal vents are a source of iron to the oceans, but the size of this source is poorly understood. This study examines the variability in iron inputs between hydrothermal vents in different geological settings. The vents studied release different amounts of Fe, resulting in plumes with similar dissolved iron concentrations but different particulate concentrations. This will help to refine modelling of iron-limited ocean productivity.
Nicole M. Travis, Colette L. Kelly, Margaret R. Mulholland, and Karen L. Casciotti
Biogeosciences, 20, 325–347, https://doi.org/10.5194/bg-20-325-2023, https://doi.org/10.5194/bg-20-325-2023, 2023
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The primary nitrite maximum is a ubiquitous upper ocean feature where nitrite accumulates, but we still do not understand its formation and the co-occurring microbial processes involved. Using correlative methods and rates measurements, we found strong spatial patterns between environmental conditions and depths of the nitrite maxima, but not the maximum concentrations. Nitrification was the dominant source of nitrite, with occasional high nitrite production from phytoplankton near the coast.
Natacha Le Grix, Jakob Zscheischler, Keith B. Rodgers, Ryohei Yamaguchi, and Thomas L. Frölicher
Biogeosciences, 19, 5807–5835, https://doi.org/10.5194/bg-19-5807-2022, https://doi.org/10.5194/bg-19-5807-2022, 2022
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Compound events threaten marine ecosystems. Here, we investigate the potentially harmful combination of marine heatwaves with low phytoplankton productivity. Using satellite-based observations, we show that these compound events are frequent in the low latitudes. We then investigate the drivers of these compound events using Earth system models. The models share similar drivers in the low latitudes but disagree in the high latitudes due to divergent factors limiting phytoplankton production.
Abigale M. Wyatt, Laure Resplandy, and Adrian Marchetti
Biogeosciences, 19, 5689–5705, https://doi.org/10.5194/bg-19-5689-2022, https://doi.org/10.5194/bg-19-5689-2022, 2022
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Marine heat waves (MHWs) are a frequent event in the northeast Pacific, with a large impact on the region's ecosystems. Large phytoplankton in the North Pacific Transition Zone are greatly affected by decreased nutrients, with less of an impact in the Alaskan Gyre. For small phytoplankton, MHWs increase the spring small phytoplankton population in both regions thanks to reduced light limitation. In both zones, this results in a significant decrease in the ratio of large to small phytoplankton.
Margot C. F. Debyser, Laetitia Pichevin, Robyn E. Tuerena, Paul A. Dodd, Antonia Doncila, and Raja S. Ganeshram
Biogeosciences, 19, 5499–5520, https://doi.org/10.5194/bg-19-5499-2022, https://doi.org/10.5194/bg-19-5499-2022, 2022
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We focus on the exchange of key nutrients for algae production between the Arctic and Atlantic oceans through the Fram Strait. We show that the export of dissolved silicon here is controlled by the availability of nitrate which is influenced by denitrification on Arctic shelves. We suggest that any future changes in the river inputs of silica and changes in denitrification due to climate change will impact the amount of silicon exported, with impacts on Atlantic algal productivity and ecology.
Emily J. Zakem, Barbara Bayer, Wei Qin, Alyson E. Santoro, Yao Zhang, and Naomi M. Levine
Biogeosciences, 19, 5401–5418, https://doi.org/10.5194/bg-19-5401-2022, https://doi.org/10.5194/bg-19-5401-2022, 2022
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We use a microbial ecosystem model to quantitatively explain the mechanisms controlling observed relative abundances and nitrification rates of ammonia- and nitrite-oxidizing microorganisms in the ocean. We also estimate how much global carbon fixation can be associated with chemoautotrophic nitrification. Our results improve our understanding of the controls on nitrification, laying the groundwork for more accurate predictions in global climate models.
Zuozhu Wen, Thomas J. Browning, Rongbo Dai, Wenwei Wu, Weiying Li, Xiaohua Hu, Wenfang Lin, Lifang Wang, Xin Liu, Zhimian Cao, Haizheng Hong, and Dalin Shi
Biogeosciences, 19, 5237–5250, https://doi.org/10.5194/bg-19-5237-2022, https://doi.org/10.5194/bg-19-5237-2022, 2022
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Fe and P are key factors controlling the biogeography and activity of marine N2-fixing microorganisms. We found lower abundance and activity of N2 fixers in the northern South China Sea than around the western boundary of the North Pacific, and N2 fixation rates switched from Fe–P co-limitation to P limitation. We hypothesize the Fe supply rates and Fe utilization strategies of each N2 fixer are important in regulating spatial variability in community structure across the study area.
Claudia Eisenring, Sophy E. Oliver, Samar Khatiwala, and Gregory F. de Souza
Biogeosciences, 19, 5079–5106, https://doi.org/10.5194/bg-19-5079-2022, https://doi.org/10.5194/bg-19-5079-2022, 2022
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Given the sparsity of observational constraints on micronutrients such as zinc (Zn), we assess the sensitivities of a framework for objective parameter optimisation in an oceanic Zn cycling model. Our ensemble of optimisations towards synthetic data with varying kinds of uncertainty shows that deficiencies related to model complexity and the choice of the misfit function generally have a greater impact on the retrieval of model Zn uptake behaviour than does the limitation of data coverage.
Yoshikazu Sasai, Sherwood Lan Smith, Eko Siswanto, Hideharu Sasaki, and Masami Nonaka
Biogeosciences, 19, 4865–4882, https://doi.org/10.5194/bg-19-4865-2022, https://doi.org/10.5194/bg-19-4865-2022, 2022
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We have investigated the adaptive response of phytoplankton growth to changing light, nutrients, and temperature over the North Pacific using two physical-biological models. We compare modeled chlorophyll and primary production from an inflexible control model (InFlexPFT), which assumes fixed carbon (C):nitrogen (N):chlorophyll (Chl) ratios, to a recently developed flexible phytoplankton functional type model (FlexPFT), which incorporates photoacclimation and variable C:N:Chl ratios.
Jens Terhaar, Thomas L. Frölicher, and Fortunat Joos
Biogeosciences, 19, 4431–4457, https://doi.org/10.5194/bg-19-4431-2022, https://doi.org/10.5194/bg-19-4431-2022, 2022
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Estimates of the ocean sink of anthropogenic carbon vary across various approaches. We show that the global ocean carbon sink can be estimated by three parameters, two of which approximate the ocean ventilation in the Southern Ocean and the North Atlantic, and one of which approximates the chemical capacity of the ocean to take up carbon. With observations of these parameters, we estimate that the global ocean carbon sink is 10 % larger than previously assumed, and we cut uncertainties in half.
Natasha René van Horsten, Hélène Planquette, Géraldine Sarthou, Thomas James Ryan-Keogh, Nolwenn Lemaitre, Thato Nicholas Mtshali, Alakendra Roychoudhury, and Eva Bucciarelli
Biogeosciences, 19, 3209–3224, https://doi.org/10.5194/bg-19-3209-2022, https://doi.org/10.5194/bg-19-3209-2022, 2022
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The remineralisation proxy, barite, was measured along 30°E in the southern Indian Ocean during early austral winter. To our knowledge this is the first reported Southern Ocean winter study. Concentrations throughout the water column were comparable to observations during spring to autumn. By linking satellite primary production to this proxy a possible annual timescale is proposed. These findings also suggest possible carbon remineralisation from satellite data on a basin scale.
Zhibo Shao and Ya-Wei Luo
Biogeosciences, 19, 2939–2952, https://doi.org/10.5194/bg-19-2939-2022, https://doi.org/10.5194/bg-19-2939-2022, 2022
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Non-cyanobacterial diazotrophs (NCDs) may be an important player in fixing N2 in the ocean. By conducting meta-analyses, we found that a representative marine NCD phylotype, Gamma A, tends to inhabit ocean environments with high productivity, low iron concentration and high light intensity. It also appears to be more abundant inside cyclonic eddies. Our study suggests a niche differentiation of NCDs from cyanobacterial diazotrophs as the latter prefers low-productivity and high-iron oceans.
Coraline Leseurre, Claire Lo Monaco, Gilles Reverdin, Nicolas Metzl, Jonathan Fin, Claude Mignon, and Léa Benito
Biogeosciences, 19, 2599–2625, https://doi.org/10.5194/bg-19-2599-2022, https://doi.org/10.5194/bg-19-2599-2022, 2022
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Decadal trends of fugacity of CO2 (fCO2), total alkalinity (AT), total carbon (CT) and pH in surface waters are investigated in different domains of the southern Indian Ocean (45°S–57°S) from ongoing and station observations regularly conducted in summer over the period 1998–2019. The fCO2 increase and pH decrease are mainly driven by anthropogenic CO2 estimated just below the summer mixed layer, as well as by a warming south of the polar front or in the fertilized waters near Kerguelen Island.
Priscilla Le Mézo, Jérôme Guiet, Kim Scherrer, Daniele Bianchi, and Eric Galbraith
Biogeosciences, 19, 2537–2555, https://doi.org/10.5194/bg-19-2537-2022, https://doi.org/10.5194/bg-19-2537-2022, 2022
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This study quantifies the role of commercially targeted fish biomass in the cycling of three important nutrients (N, P, and Fe), relative to nutrients otherwise available in water and to nutrients required by primary producers, and the impact of fishing. We use a model of commercially targeted fish biomass constrained by fish catch and stock assessment data to assess the contributions of fish at the global scale, at the time of the global peak catch and prior to industrial fishing.
Rebecca Chmiel, Nathan Lanning, Allison Laubach, Jong-Mi Lee, Jessica Fitzsimmons, Mariko Hatta, William Jenkins, Phoebe Lam, Matthew McIlvin, Alessandro Tagliabue, and Mak Saito
Biogeosciences, 19, 2365–2395, https://doi.org/10.5194/bg-19-2365-2022, https://doi.org/10.5194/bg-19-2365-2022, 2022
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Dissolved cobalt is present in trace amounts in seawater and is a necessary nutrient for marine microbes. On a transect from the Alaskan coast to Tahiti, we measured seawater concentrations of dissolved cobalt. Here, we describe several interesting features of the Pacific cobalt cycle including cobalt sources along the Alaskan coast and Hawaiian vents, deep-ocean particle formation, cobalt activity in low-oxygen regions, and how our samples compare to a global biogeochemical model’s predictions.
Nicolas Metzl, Claire Lo Monaco, Coraline Leseurre, Céline Ridame, Jonathan Fin, Claude Mignon, Marion Gehlen, and Thi Tuyet Trang Chau
Biogeosciences, 19, 1451–1468, https://doi.org/10.5194/bg-19-1451-2022, https://doi.org/10.5194/bg-19-1451-2022, 2022
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During an oceanographic cruise conducted in January 2020 in the south-western Indian Ocean, we observed very low CO2 concentrations associated with a strong phytoplankton bloom that occurred south-east of Madagascar. This biological event led to a strong regional CO2 ocean sink not previously observed.
Darren R. Clark, Andrew P. Rees, Charissa M. Ferrera, Lisa Al-Moosawi, Paul J. Somerfield, Carolyn Harris, Graham D. Quartly, Stephen Goult, Glen Tarran, and Gennadi Lessin
Biogeosciences, 19, 1355–1376, https://doi.org/10.5194/bg-19-1355-2022, https://doi.org/10.5194/bg-19-1355-2022, 2022
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Measurements of microbial processes were made in the sunlit open ocean during a research cruise (AMT19) between the UK and Chile. These help us to understand how microbial communities maintain the function of remote ecosystems. We find that the nitrogen cycling microbes which produce nitrite respond to changes in the environment. Our insights will aid the development of models that aim to replicate and ultimately project how marine environments may respond to ongoing climate change.
Martí Galí, Marcus Falls, Hervé Claustre, Olivier Aumont, and Raffaele Bernardello
Biogeosciences, 19, 1245–1275, https://doi.org/10.5194/bg-19-1245-2022, https://doi.org/10.5194/bg-19-1245-2022, 2022
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Part of the organic matter produced by plankton in the upper ocean is exported to the deep ocean. This process, known as the biological carbon pump, is key for the regulation of atmospheric carbon dioxide and global climate. However, the dynamics of organic particles below the upper ocean layer are not well understood. Here we compared the measurements acquired by autonomous robots in the top 1000 m of the ocean to a numerical model, which can help improve future climate projections.
Marie Barbieux, Julia Uitz, Alexandre Mignot, Collin Roesler, Hervé Claustre, Bernard Gentili, Vincent Taillandier, Fabrizio D'Ortenzio, Hubert Loisel, Antoine Poteau, Edouard Leymarie, Christophe Penkerc'h, Catherine Schmechtig, and Annick Bricaud
Biogeosciences, 19, 1165–1194, https://doi.org/10.5194/bg-19-1165-2022, https://doi.org/10.5194/bg-19-1165-2022, 2022
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This study assesses marine biological production in two Mediterranean systems representative of vast desert-like (oligotrophic) areas encountered in the global ocean. We use a novel approach based on non-intrusive high-frequency in situ measurements by two profiling robots, the BioGeoChemical-Argo (BGC-Argo) floats. Our results indicate substantial yet variable production rates and contribution to the whole water column of the subsurface layer, typically considered steady and non-productive.
Filippa Fransner, Friederike Fröb, Jerry Tjiputra, Nadine Goris, Siv K. Lauvset, Ingunn Skjelvan, Emil Jeansson, Abdirahman Omar, Melissa Chierici, Elizabeth Jones, Agneta Fransson, Sólveig R. Ólafsdóttir, Truls Johannessen, and Are Olsen
Biogeosciences, 19, 979–1012, https://doi.org/10.5194/bg-19-979-2022, https://doi.org/10.5194/bg-19-979-2022, 2022
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Ocean acidification, a direct consequence of the CO2 release by human activities, is a serious threat to marine ecosystems. In this study, we conduct a detailed investigation of the acidification of the Nordic Seas, from 1850 to 2100, by using a large set of samples taken during research cruises together with numerical model simulations. We estimate the effects of changes in different environmental factors on the rate of acidification and its potential effects on cold-water corals.
Guorong Zhong, Xuegang Li, Jinming Song, Baoxiao Qu, Fan Wang, Yanjun Wang, Bin Zhang, Xiaoxia Sun, Wuchang Zhang, Zhenyan Wang, Jun Ma, Huamao Yuan, and Liqin Duan
Biogeosciences, 19, 845–859, https://doi.org/10.5194/bg-19-845-2022, https://doi.org/10.5194/bg-19-845-2022, 2022
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A predictor selection algorithm was constructed to decrease the predicting error in the surface ocean partial pressure of CO2 (pCO2) mapping by finding better combinations of pCO2 predictors in different regions. Compared with previous research using the same combination of predictors in all regions, using different predictors selected by the algorithm in different regions can effectively decrease pCO2 predicting errors.
Shantelle Smith, Katye E. Altieri, Mhlangabezi Mdutyana, David R. Walker, Ruan G. Parrott, Sedick Gallie, Kurt A. M. Spence, Jessica M. Burger, and Sarah E. Fawcett
Biogeosciences, 19, 715–741, https://doi.org/10.5194/bg-19-715-2022, https://doi.org/10.5194/bg-19-715-2022, 2022
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Ammonium is a crucial yet poorly understood component of the Southern Ocean nitrogen cycle. We attribute our finding of consistently high ammonium concentrations in the winter mixed layer to limited ammonium consumption and sustained ammonium production, conditions under which the Southern Ocean becomes a source of carbon dioxide to the atmosphere. From similar data collected over an annual cycle, we propose a seasonal cycle for ammonium in shallow polar waters – a first for the Southern Ocean.
Jannes Koelling, Dariia Atamanchuk, Johannes Karstensen, Patricia Handmann, and Douglas W. R. Wallace
Biogeosciences, 19, 437–454, https://doi.org/10.5194/bg-19-437-2022, https://doi.org/10.5194/bg-19-437-2022, 2022
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In this study, we investigate oxygen variability in the deep western boundary current in the Labrador Sea from multiyear moored records. We estimate that about half of the oxygen taken up in the interior Labrador Sea by air–sea gas exchange during deep water formation is exported southward the same year. Our results underline the complexity of the oxygen uptake and export in the Labrador Sea and highlight the important role this region plays in supplying oxygen to the deep ocean.
Céline Ridame, Julie Dinasquet, Søren Hallstrøm, Estelle Bigeard, Lasse Riemann, France Van Wambeke, Matthieu Bressac, Elvira Pulido-Villena, Vincent Taillandier, Fréderic Gazeau, Antonio Tovar-Sanchez, Anne-Claire Baudoux, and Cécile Guieu
Biogeosciences, 19, 415–435, https://doi.org/10.5194/bg-19-415-2022, https://doi.org/10.5194/bg-19-415-2022, 2022
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We show that in the Mediterranean Sea spatial variability in N2 fixation is related to the diazotrophic community composition reflecting different nutrient requirements among species. Nutrient supply by Saharan dust is of great importance to diazotrophs, as shown by the strong stimulation of N2 fixation after a simulated dust event under present and future climate conditions; the magnitude of stimulation depends on the degree of limitation related to the diazotrophic community composition.
Matthew P. Humphreys, Erik H. Meesters, Henk de Haas, Szabina Karancz, Louise Delaigue, Karel Bakker, Gerard Duineveld, Siham de Goeyse, Andreas F. Haas, Furu Mienis, Sharyn Ossebaar, and Fleur C. van Duyl
Biogeosciences, 19, 347–358, https://doi.org/10.5194/bg-19-347-2022, https://doi.org/10.5194/bg-19-347-2022, 2022
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A series of submarine sinkholes were recently discovered on Luymes Bank, part of Saba Bank, a carbonate platform in the Caribbean Netherlands. Here, we investigate the waters inside these sinkholes for the first time. One of the sinkholes contained a body of dense, low-oxygen and low-pH water, which we call the
acid lake. We use measurements of seawater chemistry to work out what processes were responsible for forming the acid lake and discuss the consequences for the carbonate platform.
Gerhard Fischer, Oscar E. Romero, Johannes Karstensen, Karl-Heinz Baumann, Nasrollah Moradi, Morten Iversen, Götz Ruhland, Marco Klann, and Arne Körtzinger
Biogeosciences, 18, 6479–6500, https://doi.org/10.5194/bg-18-6479-2021, https://doi.org/10.5194/bg-18-6479-2021, 2021
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Low-oxygen eddies in the eastern subtropical North Atlantic can form an oasis for phytoplankton growth. Here we report on particle flux dynamics at the oligotrophic Cape Verde Ocean Observatory. We observed consistent flux patterns during the passages of low-oxygen eddies. We found distinct flux peaks in late winter, clearly exceeding background fluxes. Our findings suggest that the low-oxygen eddies sequester higher organic carbon than expected for oligotrophic settings.
Matthieu Bressac, Thibaut Wagener, Nathalie Leblond, Antonio Tovar-Sánchez, Céline Ridame, Vincent Taillandier, Samuel Albani, Sophie Guasco, Aurélie Dufour, Stéphanie H. M. Jacquet, François Dulac, Karine Desboeufs, and Cécile Guieu
Biogeosciences, 18, 6435–6453, https://doi.org/10.5194/bg-18-6435-2021, https://doi.org/10.5194/bg-18-6435-2021, 2021
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Phytoplankton growth is limited by the availability of iron in about 50 % of the ocean. Atmospheric deposition of desert dust represents a key source of iron. Here, we present direct observations of dust deposition in the Mediterranean Sea. A key finding is that the input of iron from dust primarily occurred in the deep ocean, while previous studies mainly focused on the ocean surface. This new insight will enable us to better represent controls on global marine productivity in models.
Cited articles
Benitez-Nelson, C. R., Bidigare, R. R., Dickey, T. D., Landry, M. R.,
Leonard, C. L., Brown, S. L., Nencioli, F., Rii, Y. M., Maiti, K., Becker,
J. W., Bibby, T. S., Black, W., Cai, W. J., Carlson, C. A., Chen, F.,
Kuwahara, V. S., Mahaffey, C., McAndrew, P. M., Quay, P. D., Rappé, M.
S., Selph, K. E., Simmons, M. P., and Yang, E. J.: Mesoscale eddies drive
increased silica export in the subtropical Pacific Ocean, Science, 316,
1017–1021, 2007.
Björkman, K. M., Duhamel, S., Church, M. J., and Karl, D. M.: Spatial
and temporal dynamics of inorganic phosphate and adenosine-5'-triphosphate in the North Pacific Ocean, Front. Mar. Sci., 5, 235, https://doi.org/10.3389/fmars.2018.00235, 2018.
Blain, S., Bonnet, S., and Guieu, C.: Dissolved iron distribution in the tropical and sub tropical South Eastern Pacific, Biogeosciences, 5, 269–280, https://doi.org/10.5194/bg-5-269-2008, 2008.
Bonnet, S., Guieu, C., Bruyant, F., Prášil, O., Van Wambeke, F., Raimbault, P., Moutin, T., Grob, C., Gorbunov, M. Y., Zehr, J. P., Masquelier, S. M., Garczarek, L., and Claustre, H.: Nutrient limitation of primary productivity in the Southeast Pacific (BIOSOPE cruise), Biogeosciences, 5, 215–225, https://doi.org/10.5194/bg-5-215-2008, 2008.
Bonnet, S., Caffin, M., Berthelot, H., and Moutin, T.: Hotspot of N2 fixation in the western tropical South Pacific pleads for a spatial
decoupling between N2 fixation and denitrification, P. Natl. Acad.
Sci. USA, 114, E2800–E2801, 2017.
Boyd, P. W., Strzepek, R., Takeda, S., Jackson, G., Wong, C. S., McKay, R.
M., Law, C., Kiyosawa, H., Saito H., Sherry, N., Johnson, K., Gower, J., and
Ramaiah, N.: The evolution and termination of an iron-induced mesoscale bloom
in the northeast subarctic Pacific, Limnol. Oceanogr., 50, 1872–1886, 2005.
Brzezinski, M. A.: The Si:C:N ratio of marine diatoms: interspecific
variability and effect of some environmental variables, J. Phycol., 21,
347–357, 1985.
Brzezinski, M. A., Krause, J. W., Church, M. J., Karl, D. M., Li, B., Jones,
J. L., and Updyke, B.: The annual silica cycle of the North Pacific
subtropical gyre, Deep-Sea Res. Pt. I, 58, 988–1001, 2011.
Casey, J. R., Lomas, M. W., Michelou, V. K., Dyhrman, S. T., Orchard, E. D.,
Ammerman, J. W., and Sylvan, J. B.: Phytoplankton taxon-specific
orthophosphate (Pi) and ATP utilization in the western subtropical North
Atlantic, Aquat. Microb. Ecol., 58, 31–44, 2009.
Chisholm, S. W., Olson, R. J., Zettler, E. R., Goericke, R., Waterbury, J.
B., and Welschmeyer, N. A.: A novel free-living prochlorophyte abundant in
the oceanic euphotic zone, Nature, 334, 340–343, 1988.
Coleman, M. L. and Chisholm, S. W.: Ecosystem-specific selection pressures
revealed through comparative population genomics, P. Natl. Acad. Sci. USA, 107, 18634–18639, 2010.
Deutsch, C., Gruber, N., Key, R. M., and Sarmiento, J. L.: Denitrification
and N2 fixation in the Pacific Ocean, Global Biogeochem. Cy., 15,
485–506, 2001.
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, 2007.
Dore, J. E., Lukas, R., Sadler, D. W., and Karl, D. M.: Climate-driven
changes to the atmospheric CO2 sink in the subtropical North Pacific
Ocean, Nature, 424, 754–757, 2003.
Dore, J. E., Letelier, R. M., Church, M. J., Lukas, R., and Karl, D. M.:
Summer phytoplankton blooms in the oligotrophic North Pacific Subtropical
Gyre: Historical perspective and recent observations, Prog. Oceanogr., 76,
2–38, 2008.
Dugdale, R. C. and Goering, J. J.: Uptake of new and regenerated forms of
nitrogen in primary productivity, Limnol. Oceanogr., 12, 196–206, 1967.
Dugdale, R. C. and Wilkerson, F. P.: Silicate regulation of new production
in the equatorial Pacific upwelling, Nature, 391, 270–273, 1998.
Ellwood, M. J., Bowie, A. R., Hassler, C., Law, C. S., Baker, A., Sander,
S., Stevens, C., Townsend, A., Woodward, E. M. S., Wuttig, K.,
Gault-Ringold, M., Maher, W. A., Marriner, A., Nodder, S., Merwe, P. v. d.,
and Boyd, P. W.: Insights into the biogeochemical cycling of iron, nitrate,
and phosphate across a 5,300 km South Pacific zonal section (153∘ E–150∘ W), Global Biogeochem. Cy., 32, 187–207, 2018.
Eppley, R. W. and Peterson, B. J.: Particulate organic matter flux and
planktonic new production in the deep ocean, Nature, 282, 677–680, 1979.
Eppley, R. W. and Renger, E. H.: Nanomolar increase in surface layer
nitrate concentration following a small wind event, Deep-Sea Res., 35,
1119–1125, 1988.
Eppley, R. W., Garside, C., Renger, E. H., and Orellana, E.: Variability of
nitrate concentration in nitrogen-depleted subtropical surface waters, Mar.
Biol., 107, 53–60, 1990.
Falkowski, P. G. and Raven, J. A.: Aquatic photosynthesis, 2nd edn.,
Princeton University Press, Princeton, 2007.
Fanning, K. A.: Nutrient provinces in the sea: concentration ratios,
reaction rate ratios, and ideal covariation, J. Geophys. Res., 97,
5693–5712, 1992.
Garside, C.: The vertical distribution of nitrate in open ocean surface
water, Deep-Sea Res. Pt. I, 32, 723–732, 1985.
Girault, M., Arakawa, H., Barani, A., Ceccaldi, H. J., Hashihama, F., Kinouchi, S., and Gregori, G.: Distribution of ultraphytoplankton in the western part of the North Pacific subtropical gyre during a strong La Niña condition: relationship with the hydrological conditions, Biogeosciences, 10, 5947–5965, https://doi.org/10.5194/bg-10-5947-2013, 2013.
Girault, M., Arakawa, H., Barani, A., Ceccaldi, H. J., Hashihama, F., and Gregori, G.: Heterotrophic prokaryote distribution along a 2300 km transect in the North Pacific subtropical gyre during a strong La Niña conditions: relationship between distribution and hydrological conditions, Biogeosciences, 12, 3607–3621, https://doi.org/10.5194/bg-12-3607-2015, 2015.
Gruber, N. and Sarmiento, J. L.: Global patterns of marine nitrogen
fixation and denitrification, Global Biogeochem. Cy., 11, 235–266, 1997.
Hansen, H. P. and Koroleff, F.: Determination of nutrients, in: Methods of
Seawater Analysis, 3rd edn., edited by: Grasshoff, K., Kremling, K., and
Ehrhardt, D., Wiley, Weinheim, 159–228, 1999.
Hashihama, F. and Kanda, J.: Automated colorimetric determination of trace
silicic acid in seawater by gas-segmented continuous flow analysis with a
liquid waveguide capillary cell, La mer, 47, 119–127, 2010.
Hashihama, F., Horimoto, N., Kanda, J., Furuya, K., Ishimaru, T., and Saino,
T.: Temporal variation in phytoplankton composition related to water mass
properties in the central part of Sagami Bay, J. Oceanogr., 64, 23–37, 2008.
Hashihama, F., Furuya, K., Kitajima, S., Takeda, S., Takemura, T., and
Kanda, J.: Macro-scale exhaustion of surface phosphate by dinitrogen
fixation in the western North Pacific, Geophys. Res. Lett., 36, L03610, https://doi.org/10.1029/2008GL036866, 2009.
Hashihama, F., Sato, M., Takeda, S., Kanda, J., and Furuya, K.: Mesoscale
decrease of surface phosphate and associated phytoplankton dynamics in the
vicinity of the subtropical South Pacific islands, Deep-Sea Res. Pt. I, 57,
338–350, 2010.
Hashihama, F., Kanda, J., Maeda, Y., Ogawa, H., and Furuya, K.: Selective
depressions of surface silicic acid within cyclonic mesoscale eddies in the
oligotrophic western North Pacific, Deep-Sea Res. Pt. I, 90, 115–124, 2014.
Hashihama, F., Kanda, J., Tauchi, A., Kodama, T., Saito, H., and Furuya, K.:
Liquid waveguide spectrophotometric measurement of nanomolar ammonium in
seawater based on the indophenol reaction with o-phenylphenol (OPP), Talanta, 143, 374–380, 2015.
Hashihama, F., Suwa, S., Kanda, J., Ehama, M., Sakuraba, R., Kinouchi, S.,
Sato, M., Yamaguchi, T., Saito, H., Ogura, Y., Hayashi, T., Mori, H.,
Kurokawa, K., Suzuki, S., and Hamasaki, K.: Arsenate and microbial dynamics
in different phosphorus regimes of the subtropical Pacific Ocean, Prog.
Oceanogr., 176, 102115, https://doi.org/10.1016/j.pocean.2019.05.007, 2019.
Hashihama, F., Saito, H., Shiozaki, T., Ehama, M., Suwa, S., Sugiyama, T.,
Kato, H., Kanda, J., Sato, M., Kodama, T., Yamaguchi, T., Horii, S., Tanita,
I., Takino, S., Takahashi, K., Ogawa, H., Boyd, P. W., and Furuya, K.:
Biogeochemical controls of particulate phosphorus distribution across the
oligotrophic subtropical Pacific Ocean, Global Biogeochem. Cy., 34,
e2020GB006669, https://doi.org/10.1029/2020GB006669, 2020.
Hill, P. G., Mary, I., Purdie, D. A., and Zubkov, M. V.: Similarity in
microbial amino acid uptake in surface waters of the North and South
Atlantic (sub-)tropical gyres, Prog. Oceanogr., 91, 437–446, 2011.
Horii, S., Takahashi, K., Shiozaki, T., Hashihama, F., and Furuya, K.:
Stable isotopic evidence for the differential contribution of diazotrophs to
the epipelagic grazing food chain in the mid-Pacific Ocean, Global Ecol.
Biogeogr., 27, 1467–1480, 2018.
Jiang, S., Hashihama, F., and Saito, H.: Phytoplankton growth and grazing
mortality through the oligotrophic subtropical North Pacific, J. Oceanogr., https://doi.org/10.1007/s10872-020-00580-4, online first, 2021.
Jickells, T. D., An, Z. S., Andersen, K. K., Baker, A. R., Bergametti, G.,
Brooks, N., Cao, J. J., Boyd, P. W., Duce, R. A., Hunter, K. A., Kawahata,
H., Kubilay, N., laRoche, J., Liss, P. S., Mahowald, N., Prospero, J. M.,
Ridgwell, A. J., Tegen, I., and Torres, R.: Global iron concentrations
between desert dust, ocean biogeochemistry, and climate, Science, 308,
67–71, 2005.
Johnson, K. S., Riser, S. C., and Karl, D. M.: Nitrate supply from deep to
near-surface waters of the North Pacific subtropical gyre, Nature, 465,
1062–1065, 2010.
Kanda, J., Saino, T., and Hattori, A.: Nitrogen uptake by natural
populations of phytoplankton and primary production in the Pacific Ocean:
Regional variability of uptake capacity, Limnol. Oceanogr., 30, 987–999,
1985.
Karl, D. M.: Nutrient dynamics in the deep blue sea, TRENDS Microbiol., 10,
410–418, 2002.
Karl, D. M. and Björkman, K. M.: Dynamics of dissolved organic
phosphorus, in: Biogeochemistry of Marine Dissolved Organic Matter, edited
by: Hansell, D. A. and Carlson, C. A., Academic Press, Burlington, 233–334,
2015.
Karl, D. M., Church, M. J., Dore, J. E., Letelier, R. M., and Mahaffey, C.:
Predictable and efficient carbon sequestration in the North Pacific Ocean
supported by symbiotic nitrogen fixation, P. Natl. Acad. Sci. USA, 109,
1842–1849, 2012.
Kitajima, S., Furuya, K., Hashihama, F., Takeda, S., and Kanda, J.:
Latitudinal distribution of diazotrophs and their nitrogen fixation in the
tropical and subtropical western North Pacific, Limnol. Oceanogr., 54,
537–547, 2009.
Krause, J. W., Brzezinski, M. A., Villareal, T. A., and Wilson, C.: Biogenic
silica cycling during summer phytoplankton blooms in the North Pacific
subtropical gyre, Deep-Sea Res. Pt. I, 71, 49–60, 2013.
Lampe, R. H., Wang, S., Cassar, N., and Marchetti, A.: Strategies among
phytoplankton in response to alleviation of nutrient stress in a subtropical
gyre, The ISME journal, 13, 2984–2997, 2019.
Lomas, M. W. and Lipschultz, F.: Forming the primary nitrite maximum:
Nitrifiers or phytoplankton, Limnol. Oceanogr., 51, 2453–2467, 2006.
Lomas, M. W., Bonachela, J. A., Levin, S. A., and Martiny, A. C.: Impact of
ocean phytoplankton diversity on phosphate uptake, P. Natl. Acad. Sci. USA, 111, 17540–17545, 2014.
Mahaffey, C., Björkman, K. M., and Karl, D. M.: Phytoplankton response
to deep seawater nutrient addition in the North Pacific Subtropical Gyre,
Mar. Ecol. Prog. Ser., 460, 13–34, 2012.
Martin, P., Dyhrman, S. T., Lomas, M. W., Poulton, N. J., and Van Mooy, B.
A.: Accumulation and enhanced cycling of polyphosphate by Sargasso Sea
plankton in response to low phosphorus, P. Natl. Acad. Sci. USA, 111,
8089–8094, 2014.
Martiny, A. C., Pham, C. T. A., Primeau, F. W., Vrugt, J. A., Moore, J. K.,
Levin, S. A., and Lomas, M. W.: Strong latitudinal patterns in the elemental
ratios of marine plankton and organic matter, Nat. Geosci., 6, 279–283,
2013.
Martiny, A. C., Lomas, M. W., Fu, W., Boyd, P. W., Chen, Y.-l. L., Cutter,
G. A., Ellwood, M. J., Furuya, K., Hashihama, F., Kanda, J., Karl, D. M.,
Kodama, T., Li, Q. P., Ma, J., Moutin, T., Woodward, E. M. S., and Moore, J.
K.: Biogeochemical controls of surface ocean phosphate, Sci. Adv., 5,
eaax0341, https://doi.org/10.1126/sciadv.aax0341, 2019.
McGillicuddy Jr., D. J., Anderson, L. A., Bates, N. R., Bibby, T.,
Buesseler, K. O., Carlson, C. A., Davis, C. S., Ewart, C., Falkowski, P. G.,
Goldthwait, S. A., Hansell, D. A., Jenkins, W. J., Johnson, R., Kosnyrev, V.
K., Ledwell, J. R., Li, Q. P., Siegel, D. A., and Steinberg, D. K.:
Eddy/wind interactions stimulate extraordinary mid-ocean plankton blooms,
Science, 316, 1021–1026, 2007.
Michaels, A. F., Bates, N. R., Buesseler, K. O., Carlson, C. A., and Knap,
A. H.: Carbon-cycle imbalances in the Sargasso Sea, Nature, 372, 537–540,
1994.
Miller, J. C. and Miller, J. N.: Statistics for Analytical Chemistry, 2nd
edn, Ellis Horwood, New York, 1993.
Moore, C. M., Mills, M. M., Langlois, R., Milne, A., Achterberg, E. P.,
LaRoche, J., and Geider, R. J.: Relative influence of nitrogen and
phosphorus availability on phytoplankton physiology and productivity in the
oligotrophic sub-tropical North Atlantic Ocean, Limnol. Oceanogr., 53,
291–305, 2008.
Moore, C. M., Mills, M. M., Arrigo, K. R., Berman-Frank, I., Bopp, L., Boyd,
P. W., Galbraith, E. D., Geider, R. J., Guieu, C., Jaccard, S. L., Jickells,
T. D., Roche, J. L., Lenton, T. M., Mahowald, N. M., Marañón, E.,
Marinov, I., Moore, J. K., Nakatsuka, T., Oschlies, A., Saito, M. A.,
Thingstad, T. F., Tsuda, A., and Ulloa, O.: Processes and patterns of
oceanic nutrient limitation, Nat. Geosci., 6, 701–710, 2013.
Moreno, A. R. and Martiny, A. C.: Ecological Stoichiometry of Ocean Plankton, Annu. Rev. Mar. Sci., 10, 43–69, 2018.
Nishioka, J., Nakatsuka, T., Watanabe, Y. W., Yasuda, I., Kuma, K., Ogawa,
H., Ebuchi, N., Scherbinin, A., Volkov, Y. N., Shiraiwa, T., and Wakatsuchi,
M.: Intensive mixing along an island chain controls oceanic biogeochemical
cycles, Global Biogeochem. Cy., 27, 920–929, 2013.
Nishioka, J., Obata, H., Ogawa, H., Ono, K., Yamashita, Y., Lee, K., Takeda,
S., and Yasuda, I.: Subpolar marginal seas fuel the North Pacific through
the intermediate water at the termination of the global ocean circulation,
P. Natl. Acad. Sci. USA, 117, 12665–12673, 2020.
Paulmier, A. and Ruiz-Pino, D.: Oxygen minimum zones (OMZs) in the modern
ocean, Prog. Oceanogr., 80, 113–128, 2009.
Redfield, A. C.: The biological control of chemical factors in the
environment, Am. Sci., 46, 205–221, 1958.
Rii, Y. M., Bidigare, R. R., and Church, M. J.: Differential responses of
eukaryotic phytoplankton to nitrogenous nutrients in the North Pacific
Subtropical Gyre, Front. Mar. Sci., 5, 92, https://doi.org/10.3389/fmars.2018.00092, 2018.
Robidart, J. C., Magasin, J. D., Shilova, I. N., Turk-Kubo, K. A., Wilson,
S. T., Karl, D. M., Scholin, C. A., and Zehr, J. P.: Effects of nutrient
enrichment on surface microbial community gene expression in the
oligotrophic North Pacific Subtropical Gyre, The ISME journal, 13, 374–387,
2019.
Saito, H.: The Kuroshio: its recognition, scientific activities and emerging
issues, in: Kuroshio Current, edited by: Nagai, T., Saito, H., Suzuki, K.,
and Takahashi, M., AGU-Wiley Geophysical Monograph, 243, 3–11, 2019.
Sarmiento, J. L. and Gruber, N.: Organic matter production, in: Ocean
Biogeochemical Dynamics, Princeton University Press, Princeton, 102–172,
2006.
Sato, M. and Hashihama, F.: Assessment of potential phagotrophy by pico-
and nanophytoplankton in the North Pacific Ocean using flow cytometry,
Aquat. Microb. Ecol., 82, 275–288, 2019.
Sato, M., Hashihama, F., Kitajima, S., Takeda, S., and Furuya, K.: Distribution of nano-sized Cyanobacteria in the western and central Pacific Ocean, Aquat. Microb. Ecol., 59, 273–282, 2010.
Sato, M., Sakuraba, R., and Hashihama, F.: Phosphate monoesterase and diesterase activities in the North and South Pacific Ocean, Biogeosciences, 10, 7677–7688, https://doi.org/10.5194/bg-10-7677-2013, 2013.
Sato, M., Kodama, T., Hashihama, F., and Furuya, K.: The effects of diel
cycles and temperature on size distributions of pico- and nanophytoplankton
in the subtropical and tropical Pacific Ocean, Plankton Benthos Res., 10,
26–33, 2015.
Sato, M., Shiozaki, T., and Hashihama, F.: Distribution of mixotrophic
nanoflagellates along the latitudinal transect of the central North Pacific,
J. Oceanogr., 73, 159–168, 2016.
Shilova, I. N., Mills, M. M., Robidart, J. C., Turk-Kubo, K. A.,
Björkman, K. M., Kolber, Z., Rapp, I., van Dijken, G. L., Church, M. J.,
Arrigo, K. R., Achterberg, E. P., and Zehr, J. P.: Differential effects of
nitrate, ammonium, and urea as N sources for microbial communities in the
North Pacific Ocean, Limnol. Oceanogr., 62, 2550–2574, 2017.
Shiozaki, T., Furuya, K., Kodama, T., and Takeda, S.: Contribution of
N2 fixation to new production in the western North Pacific Ocean along 155∘ E, Mar. Ecol. Prog. Ser., 377, 19–32, 2009.
Shiozaki, T., Furuya, K., Kodama, T., Kitajima, S., Takeda, S., Takemura,
T., and Kanda, J.: New estimation of N2 fixation in the western and
central Pacific Ocean and its marginal seas, Global Biogeochem. Cy., 24,
GB1015, https://doi.org/10.1029/2009GB003620, 2010.
Shiozaki, T., Kodama, T., and Furuya, K.: Large-scale impact of the island
mass effect through nitrogen fixation in the western South Pacific Ocean,
Geophys. Res. Lett., 41, 2907–2913, 2014.
Shiozaki, T., Ijichi, M., Isobe, K., Hashihama, F., Nakamura, K., Ehama, M.,
Hayashizaki, K., Takahashi, K., Hamasaki, K., and Furuya, K.: Nitrification
and its influence on biogeochemical cycles from the equatorial Pacific to
the Arctic Ocean, The ISME journal, 10, 2184–2197, 2016.
Shiozaki, T., Bombar, D., Riemann, L., Hashihama, F., Takeda, S., Yamaguchi,
T., Ehama, M., Hamasaki, K., and Furuya, K.: Basin scale variability of
active diazotrophs and nitrogen fixation in the North Pacific, from the
tropics to the subarctic Bering Sea, Global Biogeochem. Cy., 31, 996–1009, 2017.
Shiozaki, T., Bombar, D., Riemann, L., Sato, M., Hashihama, F., Kodama, T.,
Tanita, I., Takeda, S., Saito, H., Hamasaki, K., and Furuya, K.: Linkage
between dinitrogen fixation and primary production in the oligotrophic South
Pacific Ocean, Global Biogeochem. Cy., 32, 1028–1044, 2018.
Sipler, R. E. and Bronk, D. A.: Dynamics of dissolved organic nitrogen, in:
Biogeochemistry of Marine Dissolved Organic Matter, edited by: Hansell, D.
A. and Carlson, C. A., Academic Press, Burlington, 127–232, 2015.
Suzuki, R. and Ishimaru, T.: An improved method for the determination of
phytoplankton chlorophyll using N,N-Dimethylformamide, Journal of the Oceanographical Society of Japan, 46, 190–194, 1990.
Takeda, S.: Influence of iron availability on nutrient consumption ratio of
diatoms in oceanic waters, Nature, 393, 774–777, 1998.
Takeda, S. and Obata, H.: Response of equatorial Pacific phytoplankton to
subnanomolar Fe enrichment, Mar. Chem. 50, 219–227, 1995.
Toyoda, T. and Okamoto, S.: Physical forcing of late summer chlorophyll a
blooms in the oligotrophic eastern North Pacific, J. Geophys. Res.-Oceans,
122, 1849–1861, 2017.
Utermöhl, H.: Zur Vervollkommung der quantitativen
Phytolankton-Methodik, Internationale Vereinigung für Theoretische und Angewandte Limnologie: Mitteilungen, 9, 1–39, 1958.
Villareal, T. A., Brown, C. G., Brzezinski, M. A., Krause, J. W., and
Wilson, C.: Summer diatom blooms in the North Pacific Subtropical Gyre:
2008–2009, PLoS ONE, 7, e33109, https://doi.org/10.1371/journal.pone.0033109, 2012.
Wagener, T., Guieu, C., Losno, R., Bonnet, S., and Mahowald, N.: Revisiting
atmospheric dust export to the Southern Hemisphere ocean: Biogeochemical
implications, Global Biogeochem. Cy., 22, GB2006,
https://doi.org/10.1029/2007GB002984, 2008.
Waterbury, J. B., Watson, S. W., Guillard, R. R. L., and Brand, L. E.:
Widespread occurrence of a unicellular, marine planktonic, cyanobacterium,
Nature, 277, 293–294, 1979.
Wilson, C.: Chlorophyll anomalies along the critical latitude at
30∘ N in the NE Pacific, Geophys. Res. Lett., 38, L15603,
https://doi.org/10.1029/2011gl048210, 2011.
Wilson, C. and Qiu, X.: Global distribution of summer chlorophyll blooms in
the oligotrophic gyres, Prog. Oceanogr., 78, 107–134, 2008.
Wilson, C., Villareal, T. A., Brzezinski, M. A., Krause, J. W., and
Shcherbina, A. Y.: Chlorophyll bloom development and the subtropical front
in the North Pacific, J. Geophys. Res.-Oceans, 118, 1473–1488, 2013.
Woodward, E. M. S.: Nanomolar detection for phosphate and nitrate using
liquid waveguide technology, Eos T. Am. Geophys. Un., Vo. 83, 2002.
Yamaguchi, T., Sato, M., Hashihama, F., Ehama, M., Shiozaki, T., Takahashi,
K., and Furuya, K.: Basin-scale variations in labile dissolved phosphoric
monoesters and diesters in the central North Pacific Ocean, J. Geophys.
Res.-Oceans, 124, 3058–3072, 2019.
Yamaguchi, T., Sato, M., Hashihama, F., Kato, H., Sugiyama, T., Ogawa, H.,
Takahashi, K., and Furuya, K.: Longitudinal and vertical variations of
dissolved labile phosphoric monoesters and diesters in the subtropical North
Pacific, Front. Microbiol., 11, 570081, https://doi.org/10.3389/fmicb.2020.570081, 2021.
Yasui, S., Kanda, J., Usui, T., and Ogawa, H.: Seasonal variations of
dissolved organic matter and nutrients in sediment pore water in the inner
part of Tokyo Bay, J. Oceanogr., 72, 851–866, 2016.
Yasui-Tamura, S., Hashihama, F., Ogawa, H., Nishimura, T., and Kanda, J.:
Automated simultaneous determination of total dissolved nitrogen and
phosphorus in seawater by persulfate oxidation method, Talanta Open, 2,
100016, https://doi.org/10.1016/j.talo.2020.100016, 2020.
Yokokawa, T., Yang, Y., Motegi, C., and Nagata, T.: Large-scale geographical
variation in prokaryotic abundance and production in meso- and bathypelagic
zones of the central Pacific and Southern Ocean, Limnol. Oceanogr., 58,
61–73, 2013.
Zapata, M., Rodríguez, F., and Garrido, J. L.: Separation of
chlorophylls and carotenoids from marine phytoplankton: a new HPLC method
using a reversed phase C8 column and pyridine-containing mobile phases, Mar. Ecol. Prog. Ser., 195, 29–45, 2000.
Zubkov, M. V., Tarran, G. A., and Fuchs, B. M.: Depth related amino acid
uptake by Prochlorococcus cyanobacteria in the Southern Atlantic tropical gyre, FEMS Microbiol. Ecol., 50, 153–161, 2004.
Short summary
We investigated the nutrient assimilation characteristics of deep-water-induced phytoplankton blooms across the subtropical North and South Pacific Ocean. Nutrient drawdown ratios of dissolved inorganic nitrogen to phosphate were anomalously low in the western North Pacific, likely due to the high phosphate uptake capability of low-phosphate-adapted phytoplankton. The anomalous phosphate uptake might influence the maintenance of chronic phosphate depletion in the western North Pacific.
We investigated the nutrient assimilation characteristics of deep-water-induced phytoplankton...
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