Articles | Volume 20, issue 2
https://doi.org/10.5194/bg-20-325-2023
© Author(s) 2023. 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-20-325-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 Jan 2023
Research article |
| 19 Jan 2023
Nitrite cycling in the primary nitrite maxima of the eastern tropical North Pacific
Earth System Science, Stanford University, Stanford, CA 94305, USA
Colette L. Kelly
Earth System Science, Stanford University, Stanford, CA 94305, USA
Margaret R. Mulholland
Department of Ocean, Earth and Atmospheric Science, Old Dominion University,
Norfolk, VA 23529, USA
Karen L. Casciotti
Earth System Science, Stanford University, Stanford, CA 94305, USA
Related authors
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
Preprint under review 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.
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
Preprint under review 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.
Siqi Wu, Moge Du, Xianhui Sean Wan, Corday Selden, Mar Benavides, Sophie Bonnet, Robert Hamersley, Carolin R. Löscher, Margaret R. Mulholland, Xiuli Yan, and Shuh-Ji Kao
Biogeosciences Discuss., https://doi.org/10.5194/bg-2021-104, https://doi.org/10.5194/bg-2021-104, 2021
Preprint withdrawn
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Nitrogen (N2) fixation is one of the most important nutrient sources to the ocean. Here, we report N2 fixation in the deep, dark ocean in the South China Sea via a highly sensitive new method and elaborate controls, showing the overlooked importance of N2 fixation in the deep ocean. By global data compilation, we also provide an easy measured basic parameter to estimate deep N2 fixation. Our study may help to expand the area limit of N2 fixation studies and better constrain global N2 fixation.
Nicholas J. Bouskill, Mark E. Conrad, Markus Bill, Eoin L. Brodie, Yiwei Cheng, Chad Hobson, Matthew Forbes, Karen L. Casciotti, and Kenneth H. Williams
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-212, https://doi.org/10.5194/bg-2017-212, 2017
Preprint retracted
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This work couples isotope geochemical techniques with mechanistic microbial modeling in an attempt to further unravel the major factors responsible for an observed reduction in nitrate concomitant with a rising water table within floodplain sediments. We focus on 3 depths below ground surface with different periods of saturation and varying degrees of microbial nitrate loss. Using a microbial model we identify the controlling factors on denitrification responsible for these differences.
E. Rahav, B. Herut, M. R. Mulholland, B. Voß, D. Stazic, C. Steglich, W. R. Hess, and I. Berman-Frank
Biogeosciences Discuss., https://doi.org/10.5194/bgd-10-10327-2013, https://doi.org/10.5194/bgd-10-10327-2013, 2013
Revised manuscript has not been submitted
E. Rahav, B. Herut, A. Levi, M. R. Mulholland, and I. Berman-Frank
Ocean Sci., 9, 489–498, https://doi.org/10.5194/os-9-489-2013, https://doi.org/10.5194/os-9-489-2013, 2013
Related subject area
Biogeochemistry: Open Ocean
Fossil coccolith morphological attributes as a new proxy for deep ocean carbonate chemistry
Reconstructing ocean carbon storage with CMIP6 Earth system models and synthetic Argo observations
Using machine learning and Biogeochemical-Argo (BGC-Argo) floats to assess biogeochemical models and optimize observing system design
The representation of alkalinity and the carbonate pump from CMIP5 to CMIP6 Earth system models and implications for the carbon cycle
Model estimates of metazoans' contributions to the biological carbon pump
Tracing differences in iron supply to the Mid-Atlantic Ridge valley between hydrothermal vent sites: implications for the addition of iron to the deep ocean
Exploring the role of different data types and timescales for the quality of marine biogeochemical model calibration
All about Nitrite: Exploring Nitrite Sources and Sinks in the Eastern Tropical North Pacific Oxygen Minimum Zone
Hotspots and drivers of compound marine heatwaves and low net primary production extremes
Ecosystem impacts of marine heat waves in the northeast Pacific
Importance of multiple sources of iron for the upper ocean biogeochemistry over the northern Indian Ocean
Tracing the role of Arctic shelf processes in Si and N cycling and export through the Fram Strait: insights from combined silicon and nitrate isotopes
Controls on the relative abundances and rates of nitrifying microorganisms in the ocean
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
Long-distance particle transport to the central Ionian Sea
Deep chlorophyll maximum and nutricline in the Mediterranean Sea: emerging properties from a multi-platform assimilated biogeochemical model experiment
Phosphorus cycling in the upper waters of the Mediterranean Sea (PEACETIME cruise): relative contribution of external and internal sources
Fast local warming is the main driver of recent deoxygenation in the northern Arabian Sea
Influence of atmospheric deposition on biogeochemical cycles in an oligotrophic ocean system
Impact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperature
Comparing CLE-AdCSV applications using SA and TAC to determine the Fe-binding characteristics of model ligands in seawater
Impact of dust addition on Mediterranean plankton communities under present and future conditions of pH and temperature: an experimental overview
Reviews and syntheses: Trends in primary production in the Bay of Bengal – is it at a tipping point?
Incorporating the stable carbon isotope 13C in the ocean biogeochemical component of the Max Planck Institute Earth System Model
Seasonal cycling of zinc and cobalt in the south-eastern Atlantic along the GEOTRACES GA10 section
Carbon export and fate beneath a dynamic upwelled filament off the California coast
Contrasted release of insoluble elements (Fe, Al, rare earth elements, Th, Pa) after dust deposition in seawater: a tank experiment approach
On the barium–oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralization
Compound high-temperature and low-chlorophyll extremes in the ocean over the satellite period
Can machine learning extract the mechanisms controlling phytoplankton growth from large-scale observations? – A proof-of-concept study
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.
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.
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.
Iris Kriest, Julia Getzlaff, Angela Landolfi, Volkmar Sauerland, Markus Schartau, and Andreas Oschlies
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-9, https://doi.org/10.5194/bg-2023-9, 2023
Revised manuscript accepted for BG
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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
EGUsphere, https://doi.org/10.5194/egusphere-2022-1437, https://doi.org/10.5194/egusphere-2022-1437, 2022
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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 highlight the central role of nitrite in the N cycle, provide new data towards understanding how much N is available for marine productivity, and answer several open questions in marine N biogeochemistry.
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.
Priyanka Banerjee
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-224, https://doi.org/10.5194/bg-2022-224, 2022
Revised manuscript accepted for BG
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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.
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.
Léo Berline, Andrea Michelangelo Doglioli, Anne Petrenko, Stéphanie Barrillon, Boris Espinasse, Frederic A. C. Le Moigne, François Simon-Bot, Melilotus Thyssen, and François Carlotti
Biogeosciences, 18, 6377–6392, https://doi.org/10.5194/bg-18-6377-2021, https://doi.org/10.5194/bg-18-6377-2021, 2021
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While the Ionian Sea is considered a nutrient-depleted and low-phytoplankton biomass area, it is a crossroad for water mass circulation. In the central Ionian Sea, we observed a strong contrast in particle distribution across a ~100 km long transect. Using remote sensing and Lagrangian simulations, we suggest that this contrast finds its origin in the long-distance transport of particles from the north, west and east of the Ionian Sea, where phytoplankton production was more intense.
Anna Teruzzi, Giorgio Bolzon, Laura Feudale, and Gianpiero Cossarini
Biogeosciences, 18, 6147–6166, https://doi.org/10.5194/bg-18-6147-2021, https://doi.org/10.5194/bg-18-6147-2021, 2021
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During summer, maxima of phytoplankton chlorophyll concentration (DCM) occur in the subsurface of the Mediterranean Sea and can play a relevant role in carbon sequestration into the ocean interior. A numerical model based on in situ and satellite observations provides insights into the range of DCM conditions across the relatively small Mediterranean Sea and shows a western DCM that is 25 % shallower and with a higher phytoplankton chlorophyll concentration than in the eastern Mediterranean.
Elvira Pulido-Villena, Karine Desboeufs, Kahina Djaoudi, France Van Wambeke, Stéphanie Barrillon, Andrea Doglioli, Anne Petrenko, Vincent Taillandier, Franck Fu, Tiphanie Gaillard, Sophie Guasco, Sandra Nunige, Sylvain Triquet, and Cécile Guieu
Biogeosciences, 18, 5871–5889, https://doi.org/10.5194/bg-18-5871-2021, https://doi.org/10.5194/bg-18-5871-2021, 2021
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We report on phosphorus dynamics in the surface layer of the Mediterranean Sea. Highly sensitive phosphate measurements revealed vertical gradients above the phosphacline. The relative contribution of diapycnal fluxes to total external supply of phosphate to the mixed layer decreased towards the east, where atmospheric deposition dominated. Taken together, external sources of phosphate contributed little to total supply, which was mainly sustained by enzymatic hydrolysis of organic phosphorus.
Zouhair Lachkar, Michael Mehari, Muchamad Al Azhar, Marina Lévy, and Shafer Smith
Biogeosciences, 18, 5831–5849, https://doi.org/10.5194/bg-18-5831-2021, https://doi.org/10.5194/bg-18-5831-2021, 2021
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This study documents and quantifies a significant recent oxygen decline in the upper layers of the Arabian Sea and explores its drivers. Using a modeling approach we show that the fast local warming of sea surface is the main factor causing this oxygen drop. Concomitant summer monsoon intensification contributes to this trend, although to a lesser extent. These changes exacerbate oxygen depletion in the subsurface, threatening marine habitats and altering the local biogeochemistry.
France Van Wambeke, Vincent Taillandier, Karine Desboeufs, Elvira Pulido-Villena, Julie Dinasquet, Anja Engel, Emilio Marañón, Céline Ridame, and Cécile Guieu
Biogeosciences, 18, 5699–5717, https://doi.org/10.5194/bg-18-5699-2021, https://doi.org/10.5194/bg-18-5699-2021, 2021
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Simultaneous in situ measurements of (dry and wet) atmospheric deposition and biogeochemical stocks and fluxes in the sunlit waters of the open Mediterranean Sea revealed complex physical and biological processes occurring within the mixed layer. Nitrogen (N) budgets were computed to compare the sources and sinks of N in the mixed layer. The transitory effect observed after a wet dust deposition impacted the microbial food web down to the deep chlorophyll maximum.
Frédéric Gazeau, France Van Wambeke, Emilio Marañón, Maria Pérez-Lorenzo, Samir Alliouane, Christian Stolpe, Thierry Blasco, Nathalie Leblond, Birthe Zäncker, Anja Engel, Barbara Marie, Julie Dinasquet, and Cécile Guieu
Biogeosciences, 18, 5423–5446, https://doi.org/10.5194/bg-18-5423-2021, https://doi.org/10.5194/bg-18-5423-2021, 2021
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Our study shows that the impact of dust deposition on primary production depends on the initial composition and metabolic state of the tested community and is constrained by the amount of nutrients added, to sustain both the fast response of heterotrophic prokaryotes and the delayed one of phytoplankton. Under future environmental conditions, heterotrophic metabolism will be more impacted than primary production, therefore reducing the capacity of surface waters to sequester anthropogenic CO2.
Loes J. A. Gerringa, Martha Gledhill, Indah Ardiningsih, Niels Muntjewerf, and Luis M. Laglera
Biogeosciences, 18, 5265–5289, https://doi.org/10.5194/bg-18-5265-2021, https://doi.org/10.5194/bg-18-5265-2021, 2021
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For 3 decades, competitive ligand exchange–adsorptive cathodic stripping voltammetry was used to estimate the Fe-binding capacity of organic matter in seawater. In this paper the performance of the competing ligands is compared through the analysis of a series of model ligands.
The main finding of this paper is that the determined speciation parameters are not independent of the application, making interpretation of Fe speciation data more complex than it was thought before.
Frédéric Gazeau, Céline Ridame, France Van Wambeke, Samir Alliouane, Christian Stolpe, Jean-Olivier Irisson, Sophie Marro, Jean-Michel Grisoni, Guillaume De Liège, Sandra Nunige, Kahina Djaoudi, Elvira Pulido-Villena, Julie Dinasquet, Ingrid Obernosterer, Philippe Catala, and Cécile Guieu
Biogeosciences, 18, 5011–5034, https://doi.org/10.5194/bg-18-5011-2021, https://doi.org/10.5194/bg-18-5011-2021, 2021
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This paper shows that the impacts of Saharan dust deposition in different Mediterranean basins are as strong as those observed in coastal waters but differed substantially between the three tested stations, differences attributed to variable initial metabolic states. A stronger impact of warming and acidification on mineralization suggests a decreased capacity of Mediterranean surface communities to sequester CO2 following the deposition of atmospheric particles in the coming decades.
Carolin R. Löscher
Biogeosciences, 18, 4953–4963, https://doi.org/10.5194/bg-18-4953-2021, https://doi.org/10.5194/bg-18-4953-2021, 2021
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The Bay of Bengal (BoB) is classically seen as an ocean region with low primary production, which has been predicted to decrease even further. Here, the importance of such a trend is used to explore what could happen to the BoB's low-oxygen core waters if primary production decreases. Lower biological production leads to less oxygen loss in deeper waters by respiration; thus it could be that oxygen will not further decrease and the BoB will not become anoxic, different to other low-oxygen areas.
Bo Liu, Katharina D. Six, and Tatiana Ilyina
Biogeosciences, 18, 4389–4429, https://doi.org/10.5194/bg-18-4389-2021, https://doi.org/10.5194/bg-18-4389-2021, 2021
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We incorporate a new representation of the stable carbon isotope 13C in a global ocean biogeochemistry model. The model well reproduces the present-day 13C observations. We find a recent observation-based estimate of the oceanic 13C Suess effect (the decrease in 13C/12C ratio due to uptake of anthropogenic CO2; 13CSE) possibly underestimates 13CSE by 0.1–0.26 per mil. The new model will aid in better understanding the past ocean state via comparison to 13C/12C measurements from sediment cores.
Neil J. Wyatt, Angela Milne, Eric P. Achterberg, Thomas J. Browning, Heather A. Bouman, E. Malcolm S. Woodward, and Maeve C. Lohan
Biogeosciences, 18, 4265–4280, https://doi.org/10.5194/bg-18-4265-2021, https://doi.org/10.5194/bg-18-4265-2021, 2021
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Using data collected during two expeditions to the South Atlantic Ocean, we investigated how the interaction between external sources and biological activity influenced the availability of the trace metals zinc and cobalt. This is important as both metals play essential roles in the metabolism and growth of phytoplankton and thus influence primary productivity of the oceans. We found seasonal changes in both processes that helped explain upper-ocean trace metal cycling.
Hannah L. Bourne, James K. B. Bishop, Elizabeth J. Connors, and Todd J. Wood
Biogeosciences, 18, 3053–3086, https://doi.org/10.5194/bg-18-3053-2021, https://doi.org/10.5194/bg-18-3053-2021, 2021
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To learn how the biological carbon pump works in productive coastal upwelling systems, four autonomous carbon flux explorers measured carbon flux through the twilight zone beneath an offshore-flowing filament of biologically productive water. Strikingly different particle classes dominated the carbon fluxes during successive stages of the filament evolution over 30 d. Both flux and transfer efficiency were far greater than expected, suggesting an outsized filament impact in California waters.
Matthieu Roy-Barman, Lorna Foliot, Eric Douville, Nathalie Leblond, Fréderic Gazeau, Matthieu Bressac, Thibaut Wagener, Céline Ridame, Karine Desboeufs, and Cécile Guieu
Biogeosciences, 18, 2663–2678, https://doi.org/10.5194/bg-18-2663-2021, https://doi.org/10.5194/bg-18-2663-2021, 2021
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The release of insoluble elements such as aluminum (Al), iron (Fe), rare earth elements (REEs), thorium (Th) and protactinium (Pa) when Saharan dust falls over the Mediterranean Sea was studied during tank experiments under present and future climate conditions. Each element exhibited different dissolution kinetics and dissolution fractions (always lower than a few percent). Changes in temperature and/or pH under greenhouse conditions lead to a lower Th release and a higher light REE release.
Stéphanie H. M. Jacquet, Dominique Lefèvre, Christian Tamburini, Marc Garel, Frédéric A. C. Le Moigne, Nagib Bhairy, and Sophie Guasco
Biogeosciences, 18, 2205–2212, https://doi.org/10.5194/bg-18-2205-2021, https://doi.org/10.5194/bg-18-2205-2021, 2021
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We present new data concerning the relation between biogenic barium (Baxs, a tracer of carbon remineralization at mesopelagic depths), O2 consumption and prokaryotic heterotrophic production (PHP) in the Mediterranean Sea. The purpose of this paper is to improve our understanding of the relation between Baxs, PHP and O2 and to test the validity of the Dehairs transfer function in the Mediterranean Sea. This relation has never been tested in the Mediterranean Sea.
Natacha Le Grix, Jakob Zscheischler, Charlotte Laufkötter, Cecile S. Rousseaux, and Thomas L. Frölicher
Biogeosciences, 18, 2119–2137, https://doi.org/10.5194/bg-18-2119-2021, https://doi.org/10.5194/bg-18-2119-2021, 2021
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Marine ecosystems could suffer severe damage from the co-occurrence of a marine heat wave with extremely low chlorophyll concentration. Here, we provide a first assessment of compound marine heat wave and
low-chlorophyll events in the global ocean from 1998 to 2018. We reveal hotspots of these compound events in the equatorial Pacific and in the Arabian Sea and show that they mostly occur in summer at high latitudes and their frequency is modulated by large-scale modes of climate variability.
Christopher Holder and Anand Gnanadesikan
Biogeosciences, 18, 1941–1970, https://doi.org/10.5194/bg-18-1941-2021, https://doi.org/10.5194/bg-18-1941-2021, 2021
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A challenge for marine ecologists in studying phytoplankton is linking small-scale relationships found in a lab to broader relationships observed on large scales in the environment. We investigated whether machine learning (ML) could help connect these small- and large-scale relationships. ML was able to provide qualitative information about the small-scale processes from large-scale information. This method could help identify important relationships from observations in future research.
Cited articles
Al-Qutob, M., Häse, C., Tilzer, M. M., and Lazar, B.: Phytoplankton
drives nitrite dynamics in the Gulf of Aqaba, Red Sea, Mar. Ecol.-Prog. Ser.,
239, 233–239, https://doi.org/10.3354/meps239233, 2002.
Anderson, S. and Roels, O.: Effects of light intensity on nitrate and
nitrite uptake and excretion by Chaetoceros curvisetus, Mar. Biol., 62,
257–261, https://doi.org/10.1007/BF00397692, 1981.
Babbin, A. R., Boles, E. L., Mühle, J., and Weiss, R. F.: On the natural
spatio-temporal heterogeneity of South Pacific nitrous oxide, Nat. Commun.,
11, 1–9, https://doi.org/10.1038/s41467-020-17509-6, 2020.
Beman, J. M., Popp, B. N., and Francis, C. A.: Molecular and biogeochemical
evidence for ammonia oxidation by marine Crenarchaeota in the Gulf of
California, ISME J., 2, 429–441,
https://doi.org/10.1038/ismej.2007.118, 2008.
Beman, J. M., Popp, B. N., and Alford, S. E.: Quantification of ammonia
oxidation rates and ammonia-oxidizing archaea and bacteria at high
resolution in the Gulf of California and eastern tropical North Pacific
Ocean, Limnol. Oceanogr., 57, 711–726,
https://doi.org/10.4319/lo.2012.57.3.0711, 2012.
Beman, J. M., Shih, J. L., and Popp, B. N.: Nitrite oxidation in the upper
water column and oxygen minimum zone of the eastern tropical North Pacific
Ocean, ISME J., 7, 2192–2205,
https://doi.org/10.1038/ismej.2013.96, 2013.
Böhlke, J. K., Mroczkowski, S. J., and Coplen, T. B.: Oxygen isotopes in
nitrate: new reference materials for 18O:17O:16O
measurements and observations on nitrate-water equilibration: Reference
materials for O-isotopes in nitrate, Rapid Commun. Mass Sp., 17,
1835–1846, https://doi.org/10.1002/rcm.1123, 2003.
Brandhorst, W.: Nitrite Accumulation in the North-East Tropical Pacific,
Nature, 182, 679–679, https://doi.org/10.1038/182679a0, 1958.
Bronk, D. A., Glibert, P. M., and Ward, B. B.: Nitrogen Uptake, Dissolved
Organic Nitrogen Release, and New Production, Science, 265, 1843–1846,
https://doi.org/10.1126/science.265.5180.1843, 1994.
Buchwald, C. and Casciotti, K. L.: Isotopic ratios of nitrite as tracers of
the sources and age of oceanic nitrite, Nat. Geosci., 6, 308–313,
https://doi.org/10.1038/NGEO1745, 2013.
Burlacot, A., Richaud, P., Gosset, A., Li-Beisson, Y., and Peltier, G.:
Algal photosynthesis converts nitric oxide into nitrous oxide, P. Natl.
Acad. Sci. USA, 117, 2704–2709, https://doi.org/10.1073/pnas.1915276117,
2020.
Carlucci, A. F., Hartwig, E. O., and Bowes, P. M.: Biological production of
nitrite in seawater, Mar. Biol., 7, 161–166,
https://doi.org/10.1007/BF00354921, 1970.
Casciotti, K. L., Böhlke, J. K., McIlvin, M. R., Mroczkowski, S. J., and
Hannon, J. E.: Oxygen isotopes in nitrite: analysis, calibration, and
equilibration, Anal. Chem., 79, 2427–2436,
https://doi.org/10.1021/ac061598h, 2007.
Cline, J. D. and Richards, F. A.: Oxygen deficient conditions and nitrate
reduction in the eastern tropical North Pacific Ocean, Limnol. Oceanogr.,
17, 885–900, https://doi.org/10.4319/lo.1972.17.6.0885, 1972.
Codispoti, L. A., Friederich, G. E., Murray, J. W., and Sakamoto, C. M.:
Chemical variability in the Black Sea: implications of continuous vertical
profiles that penetrated the oxic/anoxic interface, Deep-Sea Res. Pt.
A, 38, S691–S710,
https://doi.org/10.1016/S0198-0149(10)80004-4, 1991.
Collos, Y.: Transient situations in nitrate assimilation by marine diatoms.
2. Changes in nitrate and nitrite following a nitrate perturbation, Limnol.
Oceanogr., 27, 528–535, 1982a.
Collos, Y.: Transient situations in nitrate assimilation by marine diatoms.
III. Short-term uncoupling of nitrate uptake and reduction, J. Exp. Mar.
Biol. Ecol., 62, 285–295, https://doi.org/10.1016/0022-0981(82)90208-8,
1982b.
Collos, Y.: Nitrate uptake, nitrite release and uptake, and new production
estimates, Mar. Ecol.-Prog. Ser., 171, 293–301, https://doi.org/10.3354/meps171293, 1998.
Cornec, M., Claustre, H., Mignot, A., Guidi, L., Lacour, L., Poteau, A.,
D'Ortenzio, F., Gentili, B., and Schmechtig, C.: Deep Chlorophyll Maxima in
the Global Ocean: Occurrences, Drivers and Characteristics, Global
Biogeochem. Cy., 35, e2020GB006759, https://doi.org/10.1029/2020GB006759, 2021.
Dore, J. E. and Karl, D. M.: Nitrite distributions and dynamics at Station
ALOHA, Deep-Sea Res. Pt. II, 43,
385–402, https://doi.org/10.1016/0967-0645(95)00105-0, 1996.
Dugdale, R. and Goering, J.: Uptake of new and regenerated forms of nitrogen
in primary productivity, Limnol. Oceanogr, 12, 196–206, https://doi.org/10.4319/lo.1967.12.2.0196, 1967.
Dugdale, R. and Wilkerson, F.: The use of 15N to measure nitrogen uptake in
eutrophic oceans; experimental considerations1, 2, Limnol.
Oceanogr., 31, 673–689, https://doi.org/10.4319/lo.1986.31.4.0673, 1986.
Eppley, R. W. and Coatsworth, J. L.: Uptake of nitrate and nitrite by
Ditylum Brightwelli – Kinetics and mechanisms, J. Phycol., 4,
151–156, https://doi.org/10.1111/j.1529-8817.1968.tb04689.x, 1968.
Francis, C. A., Roberts, K. J., Beman, J. M., Santoro, A. E., and Oakley, B.
B.: Ubiquity and diversity of ammonia-oxidizing archaea in water columns and
sediments of the ocean, P. Natl. Acad. Sci. USA, 102, 14683–14688,
https://doi.org/10.1073/pnas.0506625102, 2005.
Francis, C. A., Beman, J. M., and Kuypers, M. M. M.: New processes and
players in the nitrogen cycle: the microbial ecology of anaerobic and
archaeal ammonia oxidation, ISME J., 1, 19–27,
https://doi.org/10.1038/ismej.2007.8, 2007.
French, D. P., Furnas, M. J., and Smayda, T. J.: Diel changes in nitrite
concentration in the chlorophyll maximum in the Gulf of Mexico, Deep-Sea
Res. Pt. A, 30, 707–722,
https://doi.org/10.1073/pnas.0506625102, 1983.
Füssel, J., Lam, P., Lavik, G., Jensen, M. M., Holtappels, M.,
Günter, M., and Kuypers, M. M.: Nitrite oxidation in the Namibian oxygen
minimum zone, ISME J., 6, 1200–1209,
https://doi.org/10.1038/ismej.2011.178, 2012.
Glibert, P. M., Middelburg, J. J., McClelland, J. W., and Jake Vander
Zanden, M.: Stable isotope tracers: Enriching our perspectives and questions
on sources, fates, rates, and pathways of major elements in aquatic systems,
Limnol. Oceanogr., 64, 950–981, https://doi.org/10.1002/lno.11087, 2019.
Granger, J. and Sigman, D. M.: Removal of nitrite with sulfamic acid for
nitrate N and O isotope analysis with the denitrifier method, Rapid
Commun. Mass Sp., 23, 3753–3762,
https://doi.org/10.1002/rcm.4307, 2009.
Grömping, U.: relaimpo: Relative Importance of Regressors in Linear, R package version 2.2-6, CRAN [code], https://CRAN.R-project.org/package=relaimpo (last acess: 1 June 2022), 2006.
Gruber, N.: The marine nitrogen cycle: overview and challenges, Nitrogen in
the Marine Environment, 2, 1–50, https://doi.org/10.1038/nature06592, 2008.
Guerrero, M. A. and Jones, R. D.: Photoinhibition of marine nitrifying
bacteria. I. Wavelength-dependent response, Mar. Ecol.-Prog. Ser.,
141, 183–192, https://doi.org/10.3354/meps141183, 1996.
Hattori, A. and Wada, E.: Nitrite distribution and its regulating processes
in the equatorial Pacific Ocean, in: Deep Sea Research and Oceanographic
Abstracts, 18, 557–568, https://doi.org/10.1016/0011-7471(71)90122-7, 1971.
Herbland, A. and Voituriez, B.: Hydrological structure analysis for
estimating the primary production in the tropical Atlantic Ocean, J.
Marine Res., 37, 87–101, 1979.
Holligan, P. M., Balch, W. M., and Yentsch, C. M.: The significance of
subsurface chlorophyll, nitrite and ammonium maxima in relation to nitrogen
for phytoplankton growth in stratified waters of the Gulf of Maine, J. Marine Res., 42, 1051–1073,
https://doi.org/10.1357/002224084788520747, 1984.
Holmes, R. M., Aminot, A., Kérouel, R., Hooker, B. A., and Peterson, B.
J.: A simple and precise method for measuring ammonium in marine and
freshwater ecosystems, Can. J. Fish. Aquat. Sci.,
56, 1801–1808, https://doi.org/10.1139/f99-128, 1999.
Horak, R. E. A., Qin, W., Bertagnolli, A. D., Nelson, A., Heal, K. R., Han,
H., Heller, M., Schauer, A. J., Jeffrey, W. H., Armbrust, E. V., Moffett, J.
W., Ingalls, A. E., Stahl, D. A., and Devol, A. H.: Relative impacts of
light, temperature, and reactive oxygen on thaumarchaeal ammonia oxidation
in the North Pacific Ocean, Limnol. Oceanogr., 63, 741–757,
https://doi.org/10.1002/lno.10665, 2018.
Kelly, C. L., Travis, N. M., Baya, P. A., and Casciotti, K. L.: Quantifying
Nitrous Oxide Cycling Regimes in the Eastern Tropical North Pacific Ocean
With Isotopomer Analysis, Global Biogeochem. Cy., 35, e2020GB006637,
https://doi.org/10.1029/2020GB006637, 2021.
Key, R. M., Olsen, A., Van Heuven, S., Lauvset, S. K., Velo, A., Lin, X.,
Schirnick, C., Kozyr, A., Tanhua, T., Hoppema, M., Jutterstrom, S.,
Steinfeldt, R., Jeansson, E., Ishi, M., Perez, F. F., and Suzuki, T.: Global
Ocean Data Analysis Project, Version 2 (GLODAPv2), ORNL/CDIAC-162, ND-P093, GLODAP [data set],
http://hdl.handle.net/10013/epic.46499 (last access: 1 June 2022), 2015.
Kiefer, D., Olson, R., and Holm-Hansen, O.: Another look at the nitrite and
chlorophyll maxima in the central North Pacific, in: Deep Sea Research and
Oceanographic Abstracts, 23, 1199–1208,
https://doi.org/10.1016/0011-7471(76)90895-0, 1976.
Legendre-Fixx, M.: Drivers of phytoplankton community heterogeneity in the
Eastern Tropical North Pacific, Undergraduate Thesis, University of
Washington, http://hdl.handle.net/1773/39734 (last access: 1 June 2022), 2017.
Lomas, M. W. and Glibert, P. M.: Temperature regulation of nitrate uptake: A
novel hypothesis about nitrate uptake and reduction in cool-water diatoms,
Limnol. Oceanogr., 44, 556–572, https://doi.org/10.4319/lo.1999.44.3.0556,
1999.
Lomas, M. W. and Glibert, P. M.: Comparisons of nitrate uptake, storage, and
reduction in marine diatoms and flagellates, J. Phycol., 36,
903–913, https://doi.org/10.1046/j.1529-8817.2000.99029.x, 2000.
Lomas, M. W. and Lipschultz, F.: Forming the primary nitrite maximum:
Nitrifiers or phytoplankton?, Limnol. Oceanogr., 51, 2453–2467,
https://doi.org/10.4319/lo.2006.51.5.2453, 2006.
Lumley, T. based on F. code by A. Miller.: leaps: Regression Subset Selection, R package version 3.1, CRAN [code], https://CRAN.R-project.org/package=leaps (last access: 1 June 2022), 2020.
Lücker, S., Wagner, M., Maixner, F., Pelletier, E., Koch, H., Vacherie,
B., Rattei, T., Damsté, J. S. S., Spieck, E., Le Paslier, D., and Daims,
H.: A Nitrospira metagenome illuminates the physiology and evolution of
globally important nitrite-oxidizing bacteria, P. Natl. Acad. Sci.
USA, 107, 13479–13484, https://doi.org/10.1073/pnas.1003860107, 2010.
Lücker, S., Nowka, B., Rattei, T., Spieck, E., and Daims, H.: The Genome
of Nitrospina gracilis Illuminates the Metabolism and Evolution of the Major
Marine Nitrite Oxidizer, Front. Microbiol., 4, 27,
https://doi.org/10.3389/fmicb.2013.00027, 2013.
Mackey, K. R., Bristow, L., Parks, D. R., Altabet, M. A., Post, A. F., and
Paytan, A.: The influence of light on nitrogen cycling and the primary
nitrite maximum in a seasonally stratified sea, Prog. Ocean., 91, 545–560,
https://doi.org/10.1016/j.pocean.2011.09.001, 2011.
Martens-Habbena, W., Berube, P. M., Urakawa, H., de la Torre, J. R., and
Stahl, D. A.: Ammonia oxidation kinetics determine niche separation of
nitrifying Archaea and Bacteria, Nature, 461, 976–979,
https://doi.org/10.1038/nature08465, 2009.
McIlvin, M. R. and Altabet, M. A.: Chemical conversion of nitrate and
nitrite to nitrous oxide for nitrogen and oxygen isotopic analysis in
freshwater and seawater, Anal. Chem., 77, 5589–5595,
https://doi.org/10.1021/ac050528s, 2005.
McIlvin, M. R. and Casciotti, K. L.: Technical updates to the bacterial
method for nitrate isotopic analyses, Anal. Chem., 83, 1850–1856,
https://doi.org/10.1021/ac1028984, 2011.
Meeder, E., Mackey, K. R., Paytan, A., Shaked, Y., Iluz, D., Stambler, N.,
Rivlin, T., Post, A. F., and Lazar, B.: Nitrite dynamics in the open
ocean-clues from seasonal and diurnal variations, Mar. Ecol.-Prog.
Ser., 453, 11–26, https://doi.org/10.3354/meps09525, 2012.
Merbt, S. N., Stahl, D. A., Casamayor, E. O., Martí, E., Nicol, G. W.,
and Prosser, J. I.: Differential photoinhibition of bacterial and archaeal
ammonia oxidation, FEMS Microbiol. Lett., 327, 41–46,
https://doi.org/10.1111/j.1574-6968.2011.02457.x, 2012.
Miller, J. C. and Miller, J. N.: Basic Statistical Methods for Analytical Chemistry Part 1. Statistics of Repeated Measurements A Review, Analyst, 113, 1351–1356, https://doi.org/10.1039/AN9881301351, 1988.
Mincer, T. J., Church, M. J., Taylor, L. T., Preston, C., Karl, D. M., and
DeLong, E. F.: Quantitative distribution of presumptive archaeal and
bacterial nitrifiers in Monterey Bay and the North Pacific Subtropical Gyre,
Environ. Microbiol., 9, 1162–1175,
https://doi.org/10.1111/j.1462-2920.2007.01239.x, 2007.
Monreal, P. J., Kelly, C. L., Travis, N. M., and Casciotti, K. L.:
Identifying the Sources and Drivers of Nitrous Oxide Accumulation in the
Eddy-Influenced Eastern Tropical North Pacific Oxygen-Deficient Zone, Global
Biogeochem. Cy., 36, e2022GB007310, https://doi.org/10.1029/2022GB007310, 2022.
Mulholland, M. and Lomas, M.: Nitrogen uptake and assimilation, in: Nitrogen in the Marine Environment, edited by: Capone, D. G., Bronk, D. A., Mulholland, M., and Carpenter, E. J., Elsevier, San Diego, https://doi.org/10.1016/B978-0-12-372522-6.00007-4, 2008.
Mulholland, M. R. and Jayakumar, A.: Dinitrogen fixation rates and diazotrophic communities in contrasting oxygen regimes of the Eastern Pacific Ocean.
Biological and Chemical Oceanography Data Management Office – BCO-DMO, Dataset version: Dec. 1 2017, [data set], https://www.bco-dmo.org/project/472492, last access: 1 December 2017.
Olsen, A., Lange, N., Key, R. M., Tanhua, T., Bittig, H. C., Kozyr, A., Álvarez, M., Azetsu-Scott, K., Becker, S., Brown, P. J., Carter, B. R., Cotrim da Cunha, L., Feely, R. A., van Heuven, S., Hoppema, M., Ishii, M., Jeansson, E., Jutterström, S., Landa, C. S., Lauvset, S. K., Michaelis, P., Murata, A., Pérez, F. F., Pfeil, B., Schirnick, C., Steinfeldt, R., Suzuki, T., Tilbrook, B., Velo, A., Wanninkhof, R., and Woosley, R. J.: An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020, Earth Syst. Sci. Data, 12, 3653–3678, https://doi.org/10.5194/essd-12-3653-2020, 2020.
Olson, R. J.: Differential photoinhibition of marine nitrifying bacteria: a
possible mechanism for the formation of the primary nitrite maximum, J. Mar.
Res., 39, 227–238, 1981.
Peng, X., Fuchsman, C. A., Jayakumar, A., Oleynik, S., Martens-Habbena, W.,
Devol, A. H., and Ward, B. B.: Ammonia and nitrite oxidation in the Eastern
Tropical North Pacific: AMMONIA AND NITRITE OXIDATION IN ETNP, Global
Biogeochem. Cy., 29, 2034–2049, https://doi.org/10.1002/2015GB005278,
2015.
Plouviez, M., Shilton, A., Packer, M. A., and Guieysse, B.: Nitrous oxide
emissions from microalgae: potential pathways and significance, J. Appl.
Phycol., 31, 1–8, https://doi.org/10.1007/s10811-018-1531-1, 2019.
Raimbault, P.: Effect of temperature on nitrite excretion by three marine
diatoms during nitrate uptake, Mar. Biol., 92, 149–155, 1986.
Rajaković, L. V., Marković, D. D., Rajaković-Ognjanović, V.
N., and Antanasijević, D. Z.: The approaches for estimation of limit of
detection for ICP-MS trace analysis of arsenic, Talanta, 102, 79–87, 2012.
Sakamoto, C. M., Friederich, G. E., and Codispoti, L. A.: MBARI procedures for automated nutrient analyses using a modified Alpkem Series 300 Rapid Flow Analyzer, Technical Report No. 90-2, Monterey Bay Aquarium Research Institute, Monterey Bay, CA, http://hdl.handle.net/1834/19792 (last access: 1 June 2022), 1990.
Santoro, A. E., Casciotti, K. L., and Francis, C. A.: Activity, abundance
and diversity of nitrifying archaea and bacteria in the central California
Current, Environ. Microbiol., 12, 1989–2006, 2010.
Santoro, A. E., Buchwald, C., McIlvin, M. R., and Casciotti, K. L.: Isotopic
signature of N2O produced by marine ammonia-oxidizing archaea, Science, 333,
1282–1285, 2011.
Santoro, A. E., Sakamoto, C. M., Smith, J. M., Plant, J. N., Gehman, A. L., Worden, A. Z., Johnson, K. S., Francis, C. A., and Casciotti, K. L.: Measurements of nitrite production in and around the primary nitrite maximum in the central California Current, Biogeosciences, 10, 7395–7410, https://doi.org/10.5194/bg-10-7395-2013, 2013.
Schaefer, S. C. and Hollibaugh, J. T.: Temperature Decouples Ammonium and
Nitrite Oxidation in Coastal Waters, Environ. Sci. Technol.,
51, 3157–3164, https://doi.org/10.1021/acs.est.6b03483, 2017.
Schleper, C., Jurgens, G., and Jonuscheit, M.: Genomic studies of
uncultivated archaea, Nat. Rev. Microbiol., 3, 479–488,
https://doi.org/10.1038/nrmicro1159, 2005.
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, ISME J., 10, 2184, https://doi.org/10.1038/ismej.2016.18, 2016.
Sigman, D. M., Casciotti, K. L., Andreani, M., Barford, C., Galanter, M.,
and Böhlke, J. K.: A Bacterial Method for the Nitrogen Isotopic Analysis
of Nitrate in Seawater and Freshwater, Anal. Chem., 73, 4145–4153,
https://doi.org/10.1021/ac010088e, 2001.
Smith, J. M., Chavez, F. P., and Francis, C. A.: Ammonium uptake by
phytoplankton regulates nitrification in the sunlit ocean, PloS one, 9,
e108173, https://doi.org/10.1371/journal.pone.0108173, 2014.
Strickland, J. D. and Parsons, T. R.: A practical handbook of seawater analysis, 2nd ed., Fisheries Research Board of Canada, Ottowa, Canada, 310 pp., https://doi.org/10.25607/OBP-1791, 1972.
Tian, H., Xu, R., Canadell, J. G., Thompson, R. L., Winiwarter, W.,
Suntharalingam, P., Davidson, E. A., Ciais, P., Jackson, R. B.,
Janssens-Maenhout, G., Prather, M. J., Regnier, P., Pan, N., Pan, S.,
Peters, G. P., Shi, H., Tubiello, F. N., Zaehle, S., Zhou, F., Arneth, A.,
Battaglia, G., Berthet, S., Bopp, L., Bouwman, A. F., Buitenhuis, E. T.,
Chang, J., Chipperfield, M. P., Dangal, S. R. S., Dlugokencky, E., Elkins,
J. W., Eyre, B. D., Fu, B., Hall, B., Ito, A., Joos, F., Krummel, P. B.,
Landolfi, A., Laruelle, G. G., Lauerwald, R., Li, W., Lienert, S., Maavara,
T., MacLeod, M., Millet, D. B., Olin, S., Patra, P. K., Prinn, R. G.,
Raymond, P. A., Ruiz, D. J., van der Werf, G. R., Vuichard, N., Wang, J.,
Weiss, R. F., Wells, K. C., Wilson, C., Yang, J., and Yao, Y.: A
comprehensive quantification of global nitrous oxide sources and sinks,
Nature, 586, 248–256, https://doi.org/10.1038/s41586-020-2780-0, 2020.
Travis, N., Kelly, C., Mullholland, M., and Casciotti, K.: Pump cast data from R/V Ron Brown 2016 cruise (RB1603), Stanford Digital Repository, [data set], https://doi.org/10.25740/gd152nx8149, 2023.
Trimmer, M., Chronopoulou, P.-M., Maanoja, S. T., Upstill-Goddard, R. C.,
Kitidis, V., and Purdy, K. J.: Nitrous oxide as a function of oxygen and
archaeal gene abundance in the North Pacific, Nat. Commun., 7, 13451,
https://doi.org/10.1038/ncomms13451, 2016.
Vaccaro, R. F. and Ryther, J. H.: Marine Phytoplankton and the Distribution
of Nitrite in the Sea*, ICES J. Mar. Sci., 25, 260–271,
https://doi.org/10.1093/icesjms/25.3.260, 1960.
Wada, E. and Hattori, A.: Nitrite metabolism in the euphotic layer of the
central North Pacific Ocean, Limnol. Oceanogr., 16, 766–772, 1971.
Wada, E. and Hattori, A.: Nitrite distribution and nitrate reduction in deep
sea waters, Deep Sea Research and Oceanographic Abstracts, 19, 123–132,
https://doi.org/10.1016/0011-7471(72)90044-7, 1972.
Wan, X. S., Sheng, H.-X., Dai, M., Zhang, Y., Shi, D., Trull, T. W., Zhu,
Y., Lomas, M. W., and Kao, S.-J.: Ambient nitrate switches the ammonium
consumption pathway in the euphotic ocean, Nat. Commun., 9, 915,
https://doi.org/10.1038/s41467-018-03363-0, 2018.
Wan, X. S., Sheng, H., Dai, M., Church, M. J., Zou, W., Li, X., Hutchins, D.
A., Ward, B. B., and Kao, S.: Phytoplankton-nitrifier interactions control
the geographic distribution of nitrite in the upper ocean, Global Biogeochem.
Cy., 35, e2021GB007072, https://doi.org/10.1029/2021GB007072, 2021.
Ward, B. and Carlucci, A.: Marine ammonia-and nitrite-oxidizing bacteria:
serological diversity determined by immunofluorescence in culture and in the
environment, Appl. Environ. Microbiol., 50, 194–201,
https://doi.org/10.1128/aem.50.2.194-201.1985, 1985.
Ward, B. B.: Temporal variability in nitrification rates and related
biogeochemical factors in Monterey Bay, California, USA, Mar. Ecol.-Prog. Ser.,
292, 97–109, https://doi.org/10.3354/meps292097, 2005.
Ward, B. B., Olson, R. J., and Perry, M. J.: Microbial nitrification rates
in the primary nitrite maximum off southern California, Deep-Sea Res.
Pt. A, 29, 247–255,
https://doi.org/10.1016/0198-0149(82)90112-1, 1982.
Ward, B. B., Kilpatrick, K. A., Renger, E. H., and Eppley, R. W.: Biological
nitrogen cycling in the nitracline, Limnol. Oceanogr., 34,
493–513, https://doi.org/10.4319/lo.1989.34.3.0493, 1989.
Watson, S. W. and Waterbury, J. B.: Characteristics of two marine nitrite
oxidizing bacteria, Nitrospina gracilis nov. gen. nov. sp. and Nitrococcus
mobilis nov. gen. nov. sp., Arch. Mikrobiol., 77, 203–230,
1971.
Xu, M. N., Li, X., Shi, D., Zhang, Y., Dai, M., Huang, T., Glibert, P. M.,
and Kao, S.: Coupled effect of substrate and light on assimilation and
oxidation of regenerated nitrogen in the euphotic ocean, Limnol. Oceanogr.,
64, 1270–1283, https://doi.org/10.1002/lno.11114, 2019.
Yool, A., Martin, A. P., Fernández, C., and Clark, D. R.: The
significance of nitrification for oceanic new production, Nature, 447,
999–1002, https://doi.org/10.1038/nature05885, 2007.
Zafiriou, O. C., Ball, L. A., and Hanley, Q.: Trace nitrite in oxic waters,
Deep Sea Res., 39, 1329–1347, https://doi.org/10.1016/0198-0149(92)90072-2,
1992.
Zakem, E. J., Al-Haj, A., Church, M. J., van Dijken, G. L., Dutkiewicz, S.,
Foster, S. Q., Fulweiler, R. W., Mills, M. M., and Follows, M. J.:
Ecological control of nitrite in the upper ocean, Nat. Commun., 9, 1206,
https://doi.org/10.1038/s41467-018-03553-w, 2018.
Zehr, J. P. and Ward, B. B.: Nitrogen Cycling in the Ocean: New Perspectives
on Processes and Paradigms, AEM, 68, 1015–1024,
https://doi.org/10.1128/AEM.68.3.1015-1024.2002, 2002.
Short summary
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.
The primary nitrite maximum is a ubiquitous upper ocean feature where nitrite accumulates, but...
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