Articles | Volume 15, issue 24
https://doi.org/10.5194/bg-15-7379-2018
© Author(s) 2018. 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-15-7379-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Dec 2018
Research article |
| 14 Dec 2018
Modelling the biogeochemical effects of heterotrophic and autotrophic N2 fixation in the Gulf of Aqaba (Israel), Red Sea
Angela M. Kuhn
CORRESPONDING AUTHOR
Department of Oceanography, Dalhousie University, Halifax, B3H 4R2,
Canada
current address: Scripps Institution of Oceanography, University of California San
Diego, La Jolla, 92093-0021, USA
Katja Fennel
Department of Oceanography, Dalhousie University, Halifax, B3H 4R2,
Canada
Ilana Berman-Frank
Mina and Everard Goodman Faculty of Life Sciences, Bar Ilan
University, Ramat Gan, 5290002, Israel
current address: Leon H. Charney School of Marine Sciences, University of Haifa, Mt.
Carmel, Haifa, 3498838, Israel
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Zhibo Shao, Yangchun Xu, Hua Wang, Weicheng Luo, Lice Wang, Yuhong Huang, Nona Sheila R. Agawin, Ayaz Ahmed, Mar Benavides, Mikkel Bentzon-Tilia, Ilana Berman-Frank, Hugo Berthelot, Isabelle C. Biegala, Mariana B. Bif, Antonio Bode, Sophie Bonnet, Deborah A. Bronk, Mark V. Brown, Lisa Campbell, Douglas G. Capone, Edward J. Carpenter, Nicolas Cassar, Bonnie X. Chang, Dreux Chappell, Yuh-ling Lee Chen, Matthew J. Church, Francisco M. Cornejo-Castillo, Amália Maria Sacilotto Detoni, Scott C. Doney, Cecile Dupouy, Marta Estrada, Camila Fernandez, Bieito Fernández-Castro, Debany Fonseca-Batista, Rachel A. Foster, Ken Furuya, Nicole Garcia, Kanji Goto, Jesús Gago, Mary R. Gradoville, M. Robert Hamersley, Britt A. Henke, Cora Hörstmann, Amal Jayakumar, Zhibing Jiang, Shuh-Ji Kao, David M. Karl, Leila R. Kittu, Angela N. Knapp, Sanjeev Kumar, Julie LaRoche, Hongbin Liu, Jiaxing Liu, Caroline Lory, Carolin R. Löscher, Emilio Marañón, Lauren F. Messer, Matthew M. Mills, Wiebke Mohr, Pia H. Moisander, Claire Mahaffey, Robert Moore, Beatriz Mouriño-Carballido, Margaret R. Mulholland, Shin-ichiro Nakaoka, Joseph A. Needoba, Eric J. Raes, Eyal Rahav, Teodoro Ramírez-Cárdenas, Christian Furbo Reeder, Lasse Riemann, Virginie Riou, Julie C. Robidart, Vedula V. S. S. Sarma, Takuya Sato, Himanshu Saxena, Corday Selden, Justin R. Seymour, Dalin Shi, Takuhei Shiozaki, Arvind Singh, Rachel E. Sipler, Jun Sun, Koji Suzuki, Kazutaka Takahashi, Yehui Tan, Weiyi Tang, Jean-Éric Tremblay, Kendra Turk-Kubo, Zuozhu Wen, Angelicque E. White, Samuel T. Wilson, Takashi Yoshida, Jonathan P. Zehr, Run Zhang, Yao Zhang, and Ya-Wei Luo
Earth Syst. Sci. Data, 15, 3673–3709, https://doi.org/10.5194/essd-15-3673-2023, https://doi.org/10.5194/essd-15-3673-2023, 2023
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N2 fixation by marine diazotrophs is an important bioavailable N source to the global ocean. This updated global oceanic diazotroph database increases the number of in situ measurements of N2 fixation rates, diazotrophic cell abundances, and nifH gene copy abundances by 184 %, 86 %, and 809 %, respectively. Using the updated database, the global marine N2 fixation rate is estimated at 223 ± 30 Tg N yr−1, which triplicates that using the original database.
Benjamin Richaud, Katja Fennel, Eric C. J. Oliver, Michael D. DeGrandpre, Timothée Bourgeois, Xianmin Hu, and Youyu Lu
The Cryosphere, 17, 2665–2680, https://doi.org/10.5194/tc-17-2665-2023, https://doi.org/10.5194/tc-17-2665-2023, 2023
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Sea ice is a dynamic carbon reservoir. Its seasonal growth and melt modify the carbonate chemistry in the upper ocean, with consequences for the Arctic Ocean carbon sink. Yet, the importance of this process is poorly quantified. Using two independent approaches, this study provides new methods to evaluate the error in air–sea carbon flux estimates due to the lack of biogeochemistry in ice in earth system models. Those errors range from 5 % to 30 %, depending on the model and climate projection.
Katja Fennel, Matthew C. Long, Christopher Algar, Brendan Carter, David Keller, Arnaud Laurent, Jann Paul Mattern, Ruth Musgrave, Andreas Oschlies, Josiane Ostiguy, Jamie Palter, and Daniel B. Whitt
State Planet Discuss., https://doi.org/10.5194/sp-2023-10, https://doi.org/10.5194/sp-2023-10, 2023
Preprint under review for SP
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This chapter describes biogeochemical models and modeling techniques for applications related to Ocean Alkalinity Enhancement (OAE) research. Many of the most pressing OAE-related research questions cannot be addressed by observation along and will require a combination of skillful models and observations. We present illustrative examples with references to further information, describe limitations, caveats, and future research needs, and provide practical recommendations.
Li-Qing Jiang, Adam Subhas, Daniela Basso, Katja Fennel, and Jean-Pierre Gattuso
State Planet Discuss., https://doi.org/10.5194/sp-2023-6, https://doi.org/10.5194/sp-2023-6, 2023
Preprint under review for SP
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This chapter offers comprehensive guidelines for ocean alkalinity enhancement (OAE) researchers on preparing their metadata and data for submission to long-term archives. These guidelines features data standards for a wide range of OAE study types and a metadata template that is universally applicable all major types of OAE studies. Controlled vocabularies for many groups of terms, including alkalinization methods, are provided. These guidelines are also applicable to ocean acidification data.
Krysten Rutherford, Katja Fennel, Lina Garcia Suarez, and Jasmin G. John
EGUsphere, https://doi.org/10.5194/egusphere-2023-987, https://doi.org/10.5194/egusphere-2023-987, 2023
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We downscaled two mid-century (~2075) ocean model projections to a high-resolution regional ocean model of the northwest North Atlantic (NA) shelf. In one projection, the NA shelf break current practically disappears; in the other it remains almost unchanged. This leads to a wide range of possible future shelf properties. More accurate projections of coastal circulation features would narrow the range of possible outcomes of biogeochemical projections for shelf regions.
Robert W. Izett, Katja Fennel, Adam C. Stoer, and David P. Nicholson
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-46, https://doi.org/10.5194/bg-2023-46, 2023
Revised manuscript under review for BG
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This manuscript 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.
Arnaud Laurent, Haiyan Zhang, and Katja Fennel
Biogeosciences, 19, 5893–5910, https://doi.org/10.5194/bg-19-5893-2022, https://doi.org/10.5194/bg-19-5893-2022, 2022
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The Changjiang is the main terrestrial source of nutrients to the East China Sea (ECS). Nutrient delivery to the ECS has been increasing since the 1960s, resulting in low oxygen (hypoxia) during phytoplankton decomposition in summer. River phosphorus (P) has increased less than nitrogen, and therefore, despite the large nutrient delivery, phytoplankton growth can be limited by the lack of P. Here, we investigate this link between P limitation, phytoplankton production/decomposition, and hypoxia.
Krysten Rutherford, Katja Fennel, Dariia Atamanchuk, Douglas Wallace, and Helmuth Thomas
Biogeosciences, 18, 6271–6286, https://doi.org/10.5194/bg-18-6271-2021, https://doi.org/10.5194/bg-18-6271-2021, 2021
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Using a regional model of the northwestern North Atlantic shelves in combination with a surface water time series and repeat transect observations, we investigate surface CO2 variability on the Scotian Shelf. The study highlights a strong seasonal cycle in shelf-wide pCO2 and spatial variability throughout the summer months driven by physical events. The simulated net flux of CO2 on the Scotian Shelf is out of the ocean, deviating from the global air–sea CO2 flux trend in continental shelves.
Bin Wang, Katja Fennel, and Liuqian Yu
Ocean Sci., 17, 1141–1156, https://doi.org/10.5194/os-17-1141-2021, https://doi.org/10.5194/os-17-1141-2021, 2021
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We demonstrate that even sparse BGC-Argo profiles can substantially improve biogeochemical prediction via a priori model tuning. By assimilating satellite surface chlorophyll and physical observations, subsurface distributions of physical properties and nutrients were improved immediately. The improvement of subsurface chlorophyll was modest initially but was greatly enhanced after adjusting the parameterization for light attenuation through further a priori tuning.
Thomas S. Bianchi, Madhur Anand, Chris T. Bauch, Donald E. Canfield, Luc De Meester, Katja Fennel, Peter M. Groffman, Michael L. Pace, Mak Saito, and Myrna J. Simpson
Biogeosciences, 18, 3005–3013, https://doi.org/10.5194/bg-18-3005-2021, https://doi.org/10.5194/bg-18-3005-2021, 2021
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Better development of interdisciplinary ties between biology, geology, and chemistry advances biogeochemistry through (1) better integration of contemporary (or rapid) evolutionary adaptation to predict changing biogeochemical cycles and (2) universal integration of data from long-term monitoring sites in terrestrial, aquatic, and human systems that span broad geographical regions for use in modeling.
Arnaud Laurent, Katja Fennel, and Angela Kuhn
Biogeosciences, 18, 1803–1822, https://doi.org/10.5194/bg-18-1803-2021, https://doi.org/10.5194/bg-18-1803-2021, 2021
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CMIP5 and CMIP6 models, and a high-resolution regional model, were evaluated by comparing historical simulations with observations in the northwest North Atlantic, a climate-sensitive and biologically productive ocean margin region. Many of the CMIP models performed poorly for biological properties. There is no clear link between model resolution and skill in the global models, but there is an overall improvement in performance in CMIP6 from CMIP5. The regional model performed best.
Haiyan Zhang, Katja Fennel, Arnaud Laurent, and Changwei Bian
Biogeosciences, 17, 5745–5761, https://doi.org/10.5194/bg-17-5745-2020, https://doi.org/10.5194/bg-17-5745-2020, 2020
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In coastal seas, low oxygen, which is detrimental to coastal ecosystems, is increasingly caused by man-made nutrients from land. This is especially so near mouths of major rivers, including the Changjiang in the East China Sea. Here a simulation model is used to identify the main factors determining low-oxygen conditions in the region. High river discharge is identified as the prime cause, while wind and intrusions of open-ocean water modulate the severity and extent of low-oxygen conditions.
Christopher Gordon, Katja Fennel, Clark Richards, Lynn K. Shay, and Jodi K. Brewster
Biogeosciences, 17, 4119–4134, https://doi.org/10.5194/bg-17-4119-2020, https://doi.org/10.5194/bg-17-4119-2020, 2020
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We describe a method for correcting errors in oxygen optode measurements on autonomous platforms in the ocean. The errors result from the relatively slow response time of the sensor. The correction method includes an in situ determination of the effective response time and requires the time stamps of the individual measurements. It is highly relevant for the BGC-Argo program and also applicable to gliders. We also explore if diurnal changes in oxygen can be obtained from profiling floats.
Bin Wang, Katja Fennel, Liuqian Yu, and Christopher Gordon
Biogeosciences, 17, 4059–4074, https://doi.org/10.5194/bg-17-4059-2020, https://doi.org/10.5194/bg-17-4059-2020, 2020
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We assess trade-offs between different types of biological observations, specifically satellite ocean color and BGC-Argo profiles and the benefits of combining both for optimizing a biogeochemical model of the Gulf of Mexico. Using all available observations leads to significant improvements in observed and unobserved variables (including primary production and C export). Our results highlight the significant benefits of BGC-Argo measurements for biogeochemical model optimization and validation.
Fabian Große, Katja Fennel, Haiyan Zhang, and Arnaud Laurent
Biogeosciences, 17, 2701–2714, https://doi.org/10.5194/bg-17-2701-2020, https://doi.org/10.5194/bg-17-2701-2020, 2020
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In the East China Sea, hypoxia occurs frequently from spring to fall due to high primary production and subsequent decomposition of organic matter. Nitrogen inputs from the Changjiang and the open ocean have been suggested to contribute to hypoxia formation. We used a numerical modelling approach to quantify the relative contributions of these nitrogen sources. We found that the Changjiang dominates, which suggests that nitrogen management in the watershed would improve oxygen conditions.
Liuqian Yu, Katja Fennel, Bin Wang, Arnaud Laurent, Keith R. Thompson, and Lynn K. Shay
Ocean Sci., 15, 1801–1814, https://doi.org/10.5194/os-15-1801-2019, https://doi.org/10.5194/os-15-1801-2019, 2019
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We present a first direct comparison of nonidentical versus identical twin approaches for an ocean data assimilation system. We show that the identical twin approach overestimates the value of assimilating satellite observations and undervalues the benefit of assimilating temperature and salinity profiles. Misleading assessments such as undervaluing the impact of observational assets are problematic and can lead to misguided decisions on balancing investments among different observing assets.
Katja Fennel, Simone Alin, Leticia Barbero, Wiley Evans, Timothée Bourgeois, Sarah Cooley, John Dunne, Richard A. Feely, Jose Martin Hernandez-Ayon, Xinping Hu, Steven Lohrenz, Frank Muller-Karger, Raymond Najjar, Lisa Robbins, Elizabeth Shadwick, Samantha Siedlecki, Nadja Steiner, Adrienne Sutton, Daniela Turk, Penny Vlahos, and Zhaohui Aleck Wang
Biogeosciences, 16, 1281–1304, https://doi.org/10.5194/bg-16-1281-2019, https://doi.org/10.5194/bg-16-1281-2019, 2019
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We review and synthesize available information on coastal ocean carbon fluxes around North America (NA). There is overwhelming evidence, compiled and discussed here, that the NA coastal margins act as a sink. Our synthesis shows the great diversity in processes driving carbon fluxes in different coastal regions, highlights remaining gaps in observations and models, and discusses current and anticipated future trends with respect to carbon fluxes and acidification.
Krysten Rutherford and Katja Fennel
Ocean Sci., 14, 1207–1221, https://doi.org/10.5194/os-14-1207-2018, https://doi.org/10.5194/os-14-1207-2018, 2018
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Using a regional model of the northwestern North Atlantic shelves, we calculate transport timescales and pathways in order to understand the transport processes that underlie the rapid oxygen loss, air–sea CO2 flux, and supply of plankton seed populations on the Scotian Shelf. Study results highlight the limited connectivity between the Scotian Shelf and adjacent slope waters; instead, the dominant southwestward currents bring Grand Banks and Gulf of St. Lawrence waters to the Scotian Shelf.
Dina Spungin, Natalia Belkin, Rachel A. Foster, Marcus Stenegren, Andrea Caputo, Mireille Pujo-Pay, Nathalie Leblond, Cécile Dupouy, Sophie Bonnet, and Ilana Berman-Frank
Biogeosciences, 15, 3893–3908, https://doi.org/10.5194/bg-15-3893-2018, https://doi.org/10.5194/bg-15-3893-2018, 2018
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The way marine organisms die can determine the fate of organic matter (OM) in the ocean. We investigated whether a form of auto-induced programmed cell death (PCD) influenced phytoplankton mortality and fate of OM. Our results from high biomass blooms of the cyanobacterium Trichodesmium show evidence for PCD and high production of sticky carbon material termed transparent exopolymeric particles (TEP) that facilitates cellular aggregation and enhances the vertical flux of OM to depth.
Katja Fennel and Arnaud Laurent
Biogeosciences, 15, 3121–3131, https://doi.org/10.5194/bg-15-3121-2018, https://doi.org/10.5194/bg-15-3121-2018, 2018
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Increasing human-derived nutrient inputs to coastal oceans lead to spreading dead zones around the world. Here a biogeochemical model for the northern Gulf of Mexico, where nutrients from the Mississippi River create the largest dead zone in North American coastal waters, is used for the first time to show the effects of single and dual nutrient reductions of nitrogen (N) and phosphorus (P). Significant reductions in N or N&P load would be required to significantly reduce hypoxia in this system.
Jonathan Lemay, Helmuth Thomas, Susanne E. Craig, William J. Burt, Katja Fennel, and Blair J. W. Greenan
Biogeosciences, 15, 2111–2123, https://doi.org/10.5194/bg-15-2111-2018, https://doi.org/10.5194/bg-15-2111-2018, 2018
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We report a detailed mechanistic investigation of the impact of Hurricane Arthur on the CO2 cycling on the Scotian Shelf. We can show that in contrast to common thinking, the deepening of the surface during the summer months can lead to increased CO2 uptake as carbon-poor waters from subsurface water are brought up to the surface. Only during prolonged storm events is the deepening of the mixed layer strong enough to bring the (expected) carbon-rich water to the surface.
Julia M. Moriarty, Courtney K. Harris, Katja Fennel, Marjorie A. M. Friedrichs, Kehui Xu, and Christophe Rabouille
Biogeosciences, 14, 1919–1946, https://doi.org/10.5194/bg-14-1919-2017, https://doi.org/10.5194/bg-14-1919-2017, 2017
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In coastal aquatic environments, resuspension of sediment and organic material from the seabed into the overlying water can impact biogeochemistry. Here, we used a novel modeling approach to quantify this impact for the Rhône River delta. In the model, resuspension increased oxygen consumption during individual resuspension events, and when results were averaged over 2 months. This implies that observations and models that only represent calm conditions may underestimate net oxygen consumption.
Zuo Xue, Ruoying He, Katja Fennel, Wei-Jun Cai, Steven Lohrenz, Wei-Jen Huang, Hanqin Tian, Wei Ren, and Zhengchen Zang
Biogeosciences, 13, 4359–4377, https://doi.org/10.5194/bg-13-4359-2016, https://doi.org/10.5194/bg-13-4359-2016, 2016
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In this study we used a state-of-the-science coupled physical–biogeochemical model to simulate and examine temporal and spatial variability of sea surface CO2 concentration in the Gulf of Mexico. Our model revealed the Gulf was a net CO2 sink with a flux of 1.11 ± 0.84 × 1012 mol C yr−1. We also found that biological uptake was the primary driver making the Gulf an overall CO2 sink and that the carbon flux in the northern Gulf was very susceptible to changes in river inputs.
Dina Spungin, Ulrike Pfreundt, Hugo Berthelot, Sophie Bonnet, Dina AlRoumi, Frank Natale, Wolfgang R. Hess, Kay D. Bidle, and Ilana Berman-Frank
Biogeosciences, 13, 4187–4203, https://doi.org/10.5194/bg-13-4187-2016, https://doi.org/10.5194/bg-13-4187-2016, 2016
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The marine cyanobacterium Trichodesmium spp. forms massive blooms important to carbon and nitrogen cycling in the oceans that often collapse abruptly. We investigated a Trichodesmium bloom in the lagoon waters of New Caledonia to specifically elucidate the cellular processes mediating the bloom decline. We demonstrate physiological, biochemical, and genetic evidence for nutrient and oxidative stress that induced a genetically controlled programmed cell death (PCD) pathway leading to bloom demise.
Ulrike Pfreundt, Dina Spungin, Sophie Bonnet, Ilana Berman-Frank, and Wolfgang R. Hess
Biogeosciences, 13, 4135–4149, https://doi.org/10.5194/bg-13-4135-2016, https://doi.org/10.5194/bg-13-4135-2016, 2016
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The VAHINE experiment in the New Caledonia lagoon (SW Pacific) targeted the dynamics of nutrient pools and fluxes, N2 fixation, and the composition and productivity of the microbial communities. To connect this information to the actual activities of diverse microbial taxa, we present the analysis of the community-wide gene expression for 23 days. The results from this experiment provide insight into the microbial activities in a low-nutrient, low-chlorophyll ecosystem and within a mesocosm.
Ilana Berman-Frank, Dina Spungin, Eyal Rahav, France Van Wambeke, Kendra Turk-Kubo, and Thierry Moutin
Biogeosciences, 13, 3793–3805, https://doi.org/10.5194/bg-13-3793-2016, https://doi.org/10.5194/bg-13-3793-2016, 2016
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In the marine environment, sticky sugar-containing gels, termed transparent exopolymeric particles (TEP), are produced from biological sources and physical and chemical processes. These compounds are essential vectors enhancing downward flow of organic matter and its storage at depth. Spatial and temporal dynamics of TEPs were followed for 23 days during the VAHINE mesocosm experiment that investigated the fate of nitrogen and carbon derived from organisms fixing atmospheric N2 (diazotrophs).
A. Laurent, K. Fennel, R. Wilson, J. Lehrter, and R. Devereux
Biogeosciences, 13, 77–94, https://doi.org/10.5194/bg-13-77-2016, https://doi.org/10.5194/bg-13-77-2016, 2016
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In low oxygen environments, the lack of oxygen influences sediment biogeochemistry and in turn sediment-water fluxes. These nonlinear interactions are often missing from biogeochemical circulation models because sediment models are computationally expensive. A method for parameterizing realistic sediment-water fluxes is presented and applied to the Mississippi River Dead Zone where high primary production, stimulated by excess nutrient loads, promotes low bottom water conditions in summer.
L. Yu, K. Fennel, A. Laurent, M. C. Murrell, and J. C. Lehrter
Biogeosciences, 12, 2063–2076, https://doi.org/10.5194/bg-12-2063-2015, https://doi.org/10.5194/bg-12-2063-2015, 2015
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Our study suggests that a combination of physical processes and sediment oxygen consumption determine the spatial extent and temporal dynamics of hypoxia on the Louisiana shelf. In summer, stratification isolates oxygen-rich surface waters from hypoxic bottom waters; oxygen outgasses to the atmosphere at this time. A large fraction of primary production occurs below the pycnocline in summer, but this primary production does not strongly affect the spatial extent of hypoxic bottom waters.
K.-K. Liu, C.-K. Kang, T. Kobari, H. Liu, C. Rabouille, and K. Fennel
Biogeosciences, 11, 7061–7075, https://doi.org/10.5194/bg-11-7061-2014, https://doi.org/10.5194/bg-11-7061-2014, 2014
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This paper provides background info on the East China Sea, Japan/East Sea and South China Sea and highlights major findings in the special issue on their biogeochemical conditions and ecosystem functions. The three seas are subject to strong impacts from human activities and/or climate forcing. Because these continental margins sustain arguably some of the most productive marine ecosystems in the world, changes in these stressed ecosystems may threaten the livelihood of a large human population.
Z. Xue, R. He, K. Fennel, W.-J. Cai, S. Lohrenz, and C. Hopkinson
Biogeosciences, 10, 7219–7234, https://doi.org/10.5194/bg-10-7219-2013, https://doi.org/10.5194/bg-10-7219-2013, 2013
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
W. J. Burt, H. Thomas, K. Fennel, and E. Horne
Biogeosciences, 10, 53–66, https://doi.org/10.5194/bg-10-53-2013, https://doi.org/10.5194/bg-10-53-2013, 2013
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Joelle Habib, Caroline Ulses, Claude Estournel, Milad Fakhri, Patrick Marsaleix, Mireille Pujo-Pay, Marine Fourrier, Laurent Coppola, Alexandre Mignot, Laurent Mortier, and Pascal Conan
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The Rhodes Gyre, eastern Mediterranean Sea, is the main Levantine Intermediate Water formation site. In this study, we use a 3D physical–biogeochemical model to investigate the seasonal and interannual variability of organic carbon dynamics in the gyre. Our results show its autotrophic nature and its high interannual variability, with enhanced primary production, downward exports, and onward exports to the surrounding regions during years marked by intense heat losses and deep mixed layers.
Masihullah Hasanyar, Thomas Romary, Shuaitao Wang, and Nicolas Flipo
Biogeosciences, 20, 1621–1633, https://doi.org/10.5194/bg-20-1621-2023, https://doi.org/10.5194/bg-20-1621-2023, 2023
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The results of this study indicate that biodegradable dissolved organic matter is responsible for oxygen depletion at low flow during summer seasons when heterotrophic bacterial activity is so intense. Therefore, the dissolved organic matter must be well measured in the water monitoring networks in order to have more accurate water quality models. It also advocates for high-frequency data collection for better quantification of the uncertainties related to organic matter.
Xiangyu Liu and Qianlai Zhuang
Biogeosciences, 20, 1181–1193, https://doi.org/10.5194/bg-20-1181-2023, https://doi.org/10.5194/bg-20-1181-2023, 2023
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We are among the first to quantify methane emissions from inland water system in the pan-Arctic. The total CH4 emissions are 36.46 Tg CH4 yr−1 during 2000–2015, of which wetlands and lakes were 21.69 Tg yr−1 and 14.76 Tg yr−1, respectively. By using two non-overlap area change datasets with land and lake models, our simulation avoids small lakes being counted twice as both lake and wetland, and it narrows the gap between two different methods used to quantify regional CH4 emissions.
Corentin Clerc, Laurent Bopp, Fabio Benedetti, Meike Vogt, and Olivier Aumont
Biogeosciences, 20, 869–895, https://doi.org/10.5194/bg-20-869-2023, https://doi.org/10.5194/bg-20-869-2023, 2023
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Gelatinous zooplankton play a key role in the ocean carbon cycle. In particular, pelagic tunicates, which feed on a wide size range of prey, produce rapidly sinking detritus. Thus, they efficiently transfer carbon from the surface to the depths. Consequently, we added these organisms to a marine biogeochemical model (PISCES-v2) and evaluated their impact on the global carbon cycle. We found that they contribute significantly to carbon export and that this contribution increases with depth.
Shuang Gao, Jörg Schwinger, Jerry Tjiputra, Ingo Bethke, Jens Hartmann, Emilio Mayorga, and Christoph Heinze
Biogeosciences, 20, 93–119, https://doi.org/10.5194/bg-20-93-2023, https://doi.org/10.5194/bg-20-93-2023, 2023
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We assess the impact of riverine nutrients and carbon (C) on projected marine primary production (PP) and C uptake using a fully coupled Earth system model. Riverine inputs alleviate nutrient limitation and thus lessen the projected PP decline by up to 0.7 Pg C yr−1 globally. The effect of increased riverine C may be larger than the effect of nutrient inputs in the future on the projected ocean C uptake, while in the historical period increased nutrient inputs are considered the largest driver.
Valeria Di Biagio, Stefano Salon, Laura Feudale, and Gianpiero Cossarini
Biogeosciences, 19, 5553–5574, https://doi.org/10.5194/bg-19-5553-2022, https://doi.org/10.5194/bg-19-5553-2022, 2022
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The amount of dissolved oxygen in the ocean is the result of interacting physical and biological processes. Oxygen vertical profiles show a subsurface maximum in a large part of the ocean. We used a numerical model to map this subsurface maximum in the Mediterranean Sea and to link local differences in its properties to the driving processes. This emerging feature can help the marine ecosystem functioning to be better understood, also under the impacts of climate change.
Michael R. Stukel, Moira Décima, and Michael R. Landry
Biogeosciences, 19, 3595–3624, https://doi.org/10.5194/bg-19-3595-2022, https://doi.org/10.5194/bg-19-3595-2022, 2022
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The biological carbon pump (BCP) transports carbon into the deep ocean, leading to long-term marine carbon sequestration. It is driven by many physical, chemical, and ecological processes. We developed a model of the BCP constrained using data from 11 cruises in 4 different ocean regions. Our results show that sinking particles and vertical mixing are more important than transport mediated by vertically migrating zooplankton. They also highlight the uncertainty in current estimates of the BCP.
Ginevra Rosati, Donata Canu, Paolo Lazzari, and Cosimo Solidoro
Biogeosciences, 19, 3663–3682, https://doi.org/10.5194/bg-19-3663-2022, https://doi.org/10.5194/bg-19-3663-2022, 2022
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Methylmercury (MeHg) is produced and bioaccumulated in marine food webs, posing concerns for human exposure through seafood consumption. We modeled and analyzed the fate of MeHg in the lower food web of the Mediterranean Sea. The modeled spatial–temporal distribution of plankton bioaccumulation differs from the distribution of MeHg in surface water. We also show that MeHg exposure concentrations in temperate waters can be lowered by winter convection, which is declining due to climate change.
Yanda Ou, Bin Li, and Z. George Xue
Biogeosciences, 19, 3575–3593, https://doi.org/10.5194/bg-19-3575-2022, https://doi.org/10.5194/bg-19-3575-2022, 2022
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Over the past decades, the Louisiana–Texas shelf has been suffering recurring hypoxia (dissolved oxygen < 2 mg L−1). We developed a novel prediction model using state-of-the-art statistical techniques based on physical and biogeochemical data provided by a numerical model. The model can capture both the magnitude and onset of the annual hypoxia events. This study also demonstrates that it is possible to use a global model forecast to predict regional ocean water quality.
Eva Ehrnsten, Oleg Pavlovitch Savchuk, and Bo Gustav Gustafsson
Biogeosciences, 19, 3337–3367, https://doi.org/10.5194/bg-19-3337-2022, https://doi.org/10.5194/bg-19-3337-2022, 2022
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We studied the effects of benthic fauna, animals living on or in the seafloor, on the biogeochemical cycles of carbon, nitrogen and phosphorus using a model of the Baltic Sea ecosystem. By eating and excreting, the animals transform a large part of organic matter sinking to the seafloor into inorganic forms, which fuel plankton blooms. Simultaneously, when they move around (bioturbate), phosphorus is bound in the sediments. This reduces nitrogen-fixing plankton blooms and oxygen depletion.
Brandon J. McNabb and Philippe D. Tortell
Biogeosciences, 19, 1705–1721, https://doi.org/10.5194/bg-19-1705-2022, https://doi.org/10.5194/bg-19-1705-2022, 2022
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The trace gas dimethyl sulfide (DMS) plays an important role in the ocean sulfur cycle and can also influence Earth’s climate. Our study used two statistical methods to predict surface ocean concentrations and rates of sea–air exchange of DMS in the northeast subarctic Pacific. Our results show improved predictive power over previous approaches and suggest that nutrient availability, light-dependent processes, and physical mixing may be important controls on DMS in this region.
Xi Wei, Josette Garnier, Vincent Thieu, Paul Passy, Romain Le Gendre, Gilles Billen, Maia Akopian, and Goulven Gildas Laruelle
Biogeosciences, 19, 931–955, https://doi.org/10.5194/bg-19-931-2022, https://doi.org/10.5194/bg-19-931-2022, 2022
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Estuaries are key reactive ecosystems along the land–ocean aquatic continuum and are often strongly impacted by anthropogenic activities. We calculated nutrient in and out fluxes by using a 1-D transient model for seven estuaries along the French Atlantic coast. Among these, large estuaries with high residence times showed higher retention rates than medium and small ones. All reveal coastal eutrophication due to the excess of diffused nitrogen from intensive agricultural river basins.
Krysten Rutherford, Katja Fennel, Dariia Atamanchuk, Douglas Wallace, and Helmuth Thomas
Biogeosciences, 18, 6271–6286, https://doi.org/10.5194/bg-18-6271-2021, https://doi.org/10.5194/bg-18-6271-2021, 2021
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Using a regional model of the northwestern North Atlantic shelves in combination with a surface water time series and repeat transect observations, we investigate surface CO2 variability on the Scotian Shelf. The study highlights a strong seasonal cycle in shelf-wide pCO2 and spatial variability throughout the summer months driven by physical events. The simulated net flux of CO2 on the Scotian Shelf is out of the ocean, deviating from the global air–sea CO2 flux trend in continental shelves.
Frerk Pöppelmeier, David J. Janssen, Samuel L. Jaccard, and Thomas F. Stocker
Biogeosciences, 18, 5447–5463, https://doi.org/10.5194/bg-18-5447-2021, https://doi.org/10.5194/bg-18-5447-2021, 2021
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Chromium (Cr) is a redox-sensitive element that holds promise as a tracer of ocean oxygenation and biological activity. We here implemented the oxidation states Cr(III) and Cr(VI) in the Bern3D model to investigate the processes that shape the global Cr distribution. We find a Cr ocean residence time of 5–8 kyr and that the benthic source dominates the tracer budget. Further, regional model–data mismatches suggest strong Cr removal in oxygen minimum zones and a spatially variable benthic source.
Felipe S. Freitas, Philip A. Pika, Sabine Kasten, Bo B. Jørgensen, Jens Rassmann, Christophe Rabouille, Shaun Thomas, Henrik Sass, Richard D. Pancost, and Sandra Arndt
Biogeosciences, 18, 4651–4679, https://doi.org/10.5194/bg-18-4651-2021, https://doi.org/10.5194/bg-18-4651-2021, 2021
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It remains challenging to fully understand what controls carbon burial in marine sediments globally. Thus, we use a model–data approach to identify patterns of organic matter reactivity at the seafloor across distinct environmental conditions. Our findings support the notion that organic matter reactivity is a dynamic ecosystem property and strongly influences biogeochemical cycling and exchange. Our results are essential to improve predictions of future changes in carbon cycling and climate.
Josué Bock, Martine Michou, Pierre Nabat, Manabu Abe, Jane P. Mulcahy, Dirk J. L. Olivié, Jörg Schwinger, Parvadha Suntharalingam, Jerry Tjiputra, Marco van Hulten, Michio Watanabe, Andrew Yool, and Roland Séférian
Biogeosciences, 18, 3823–3860, https://doi.org/10.5194/bg-18-3823-2021, https://doi.org/10.5194/bg-18-3823-2021, 2021
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In this study we analyse surface ocean dimethylsulfide (DMS) concentration and flux to the atmosphere from four CMIP6 Earth system models over the historical and ssp585 simulations.
Our analysis of contemporary (1980–2009) climatologies shows that models better reproduce observations in mid to high latitudes. The models disagree on the sign of the trend of the global DMS flux from 1980 onwards. The models agree on a positive trend of DMS over polar latitudes following sea-ice retreat dynamics.
Mariana Hill Cruz, Iris Kriest, Yonss Saranga José, Rainer Kiko, Helena Hauss, and Andreas Oschlies
Biogeosciences, 18, 2891–2916, https://doi.org/10.5194/bg-18-2891-2021, https://doi.org/10.5194/bg-18-2891-2021, 2021
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In this study we use a regional biogeochemical model of the eastern tropical South Pacific Ocean to implicitly simulate the effect that fluctuations in populations of small pelagic fish, such as anchovy and sardine, may have on the biogeochemistry of the northern Humboldt Current System. To do so, we vary the zooplankton mortality in the model, under the assumption that these fishes eat zooplankton. We also evaluate the model for the first time against mesozooplankton observations.
Roman Bezhenar, Kyeong Ok Kim, Vladimir Maderich, Govert de With, and Kyung Tae Jung
Biogeosciences, 18, 2591–2607, https://doi.org/10.5194/bg-18-2591-2021, https://doi.org/10.5194/bg-18-2591-2021, 2021
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A new approach to predicting the accumulation of radionuclides in fish was developed by taking into account heterogeneity of distribution of contamination in the organism and dependence of metabolic process rates on the fish mass. Predicted concentrations of radionuclides in fish agreed well with the laboratory and field measurements. The model with the defined generic parameters could be used in marine environments without local calibration, which is important for emergency decision support.
Emil De Borger, Justin Tiano, Ulrike Braeckman, Adriaan D. Rijnsdorp, and Karline Soetaert
Biogeosciences, 18, 2539–2557, https://doi.org/10.5194/bg-18-2539-2021, https://doi.org/10.5194/bg-18-2539-2021, 2021
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Bottom trawling alters benthic mineralization: the recycling of organic material (OM) to free nutrients. To better understand how this occurs, trawling events were added to a model of seafloor OM recycling. Results show that bottom trawling reduces OM and free nutrients in sediments through direct removal thereof and of fauna which transport OM to deeper sediment layers protected from fishing. Our results support temporospatial trawl restrictions to allow key sediment functions to recover.
Britta Munkes, Ulrike Löptien, and Heiner Dietze
Biogeosciences, 18, 2347–2378, https://doi.org/10.5194/bg-18-2347-2021, https://doi.org/10.5194/bg-18-2347-2021, 2021
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Cyanobacteria blooms can strongly aggravate eutrophication problems of water bodies. Their controls are, however, not comprehensively understood, which impedes effective management and protection plans. Here we review the current understanding of cyanobacteria blooms. Juxtaposition of respective field and laboratory studies with state-of-the-art mathematical models reveals substantial uncertainty associated with nutrient demands, grazing, and death of cyanobacteria.
Jens Terhaar, Olivier Torres, Timothée Bourgeois, and Lester Kwiatkowski
Biogeosciences, 18, 2221–2240, https://doi.org/10.5194/bg-18-2221-2021, https://doi.org/10.5194/bg-18-2221-2021, 2021
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The uptake of carbon, emitted as a result of human activities, results in ocean acidification. We analyse 21st-century projections of acidification in the Arctic Ocean, a region of particular vulnerability, using the latest generation of Earth system models. In this new generation of models there is a large decrease in the uncertainty associated with projections of Arctic Ocean acidification, with freshening playing a greater role in driving acidification than previously simulated.
Tobias R. Vonnahme, Martial Leroy, Silke Thoms, Dick van Oevelen, H. Rodger Harvey, Svein Kristiansen, Rolf Gradinger, Ulrike Dietrich, and Christoph Völker
Biogeosciences, 18, 1719–1747, https://doi.org/10.5194/bg-18-1719-2021, https://doi.org/10.5194/bg-18-1719-2021, 2021
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Diatoms are crucial for Arctic coastal spring blooms, and their growth is controlled by nutrients and light. At the end of the bloom, inorganic nitrogen or silicon can be limiting, but nitrogen can be regenerated by bacteria, extending the algal growth phase. Modeling these multi-nutrient dynamics and the role of bacteria is challenging yet crucial for accurate modeling. We recreated spring bloom dynamics in a cultivation experiment and developed a representative dynamic model.
Rebecca M. Wright, Corinne Le Quéré, Erik Buitenhuis, Sophie Pitois, and Mark J. Gibbons
Biogeosciences, 18, 1291–1320, https://doi.org/10.5194/bg-18-1291-2021, https://doi.org/10.5194/bg-18-1291-2021, 2021
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Jellyfish have been included in a global ocean biogeochemical model for the first time. The global mean jellyfish biomass in the model is within the observational range. Jellyfish are found to play an important role in the plankton ecosystem, influencing community structure, spatiotemporal dynamics and biomass. The model raises questions about the sensitivity of the zooplankton community to jellyfish mortality and the interactions between macrozooplankton and jellyfish.
Valeria Di Biagio, Gianpiero Cossarini, Stefano Salon, and Cosimo Solidoro
Biogeosciences, 17, 5967–5988, https://doi.org/10.5194/bg-17-5967-2020, https://doi.org/10.5194/bg-17-5967-2020, 2020
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Events that influence the functioning of the Earth’s ecosystems are of interest in relation to a changing climate. We propose a method to identify and characterise
wavesof extreme events affecting marine ecosystems for multi-week periods over wide areas. Our method can be applied to suitable ecosystem variables and has been used to describe different kinds of extreme event waves of phytoplankton chlorophyll in the Mediterranean Sea, by analysing the output from a high-resolution model.
Maria Paula da Silva, Lino A. Sander de Carvalho, Evlyn Novo, Daniel S. F. Jorge, and Claudio C. F. Barbosa
Biogeosciences, 17, 5355–5364, https://doi.org/10.5194/bg-17-5355-2020, https://doi.org/10.5194/bg-17-5355-2020, 2020
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In this study, we analyze the seasonal changes in the dissolved organic matter (DOM) quality (based on its optical properties) in four Amazon floodplain lakes. DOM plays a fundamental role in surface water chemistry, controlling metal bioavailability and mobility, and nutrient cycling. The model proposed in our paper highlights the potential to study DOM quality at a wider spatial scale, which may help to better understand the persistence and fate of DOM in the ecosystem.
Zhengchen Zang, Z. George Xue, Kehui Xu, Samuel J. Bentley, Qin Chen, Eurico J. D'Sa, Le Zhang, and Yanda Ou
Biogeosciences, 17, 5043–5055, https://doi.org/10.5194/bg-17-5043-2020, https://doi.org/10.5194/bg-17-5043-2020, 2020
Taylor A. Shropshire, Steven L. Morey, Eric P. Chassignet, Alexandra Bozec, Victoria J. Coles, Michael R. Landry, Rasmus Swalethorp, Glenn Zapfe, and Michael R. Stukel
Biogeosciences, 17, 3385–3407, https://doi.org/10.5194/bg-17-3385-2020, https://doi.org/10.5194/bg-17-3385-2020, 2020
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Zooplankton are the smallest animals in the ocean and important food for fish. Despite their importance, zooplankton have been relatively undersampled. To better understand the zooplankton community in the Gulf of Mexico (GoM), we developed a model to simulate their dynamics. We found that heterotrophic protists are important for supporting mesozooplankton, which are the primary prey of larval fish. The model developed in this study has the potential to improve fisheries management in the GoM.
Iris Kriest, Paul Kähler, Wolfgang Koeve, Karin Kvale, Volkmar Sauerland, and Andreas Oschlies
Biogeosciences, 17, 3057–3082, https://doi.org/10.5194/bg-17-3057-2020, https://doi.org/10.5194/bg-17-3057-2020, 2020
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Constants of global biogeochemical ocean models are often tuned
by handto match observations of nutrients or oxygen. We investigate the effect of this tuning by optimising six constants of a global biogeochemical model, simulated in five different offline circulations. Optimal values for three constants adjust to distinct features of the circulation applied and can afterwards be swapped among the circulations, without losing too much of the model's fit to observed quantities.
Laura Haffert, Matthias Haeckel, Henko de Stigter, and Felix Janssen
Biogeosciences, 17, 2767–2789, https://doi.org/10.5194/bg-17-2767-2020, https://doi.org/10.5194/bg-17-2767-2020, 2020
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Deep-sea mining for polymetallic nodules is expected to have severe environmental impacts. Through prognostic modelling, this study aims to provide a holistic assessment of the biogeochemical recovery after a disturbance event. It was found that the recovery strongly depends on the impact type; e.g. complete removal of the surface sediment reduces seafloor nutrient fluxes over centuries.
Fabian A. Gomez, Rik Wanninkhof, Leticia Barbero, Sang-Ki Lee, and Frank J. Hernandez Jr.
Biogeosciences, 17, 1685–1700, https://doi.org/10.5194/bg-17-1685-2020, https://doi.org/10.5194/bg-17-1685-2020, 2020
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We use a numerical model to infer annual changes of surface carbon chemistry in the Gulf of Mexico (GoM). The main seasonality drivers of partial pressure of carbon dioxide and aragonite saturation state from the model are temperature and river runoff. The GoM basin is a carbon sink in winter–spring and carbon source in summer–fall, but uptake prevails near the Mississippi Delta year-round due to high biological production. Our model results show good correspondence with observational studies.
Simon J. Parker
Biogeosciences, 17, 305–315, https://doi.org/10.5194/bg-17-305-2020, https://doi.org/10.5194/bg-17-305-2020, 2020
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Dissolved oxygen (DO) models typically assume constant ecosystem respiration over the course of a single day. Using a data-driven approach, this research examines this assumption in four streams across two (hydro-)geological types (Chalk and Greensand). Despite hydrogeological equivalence in terms of baseflow index for each hydrogeological pairing, model suitability differed within, rather than across, geology types. This corresponded with associated differences in timings of DO minima.
Fabrice Lacroix, Tatiana Ilyina, and Jens Hartmann
Biogeosciences, 17, 55–88, https://doi.org/10.5194/bg-17-55-2020, https://doi.org/10.5194/bg-17-55-2020, 2020
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Contributions of rivers to the oceanic cycling of carbon have been poorly represented in global models until now. Here, we assess the long–term implications of preindustrial riverine loads in the ocean in a novel framework which estimates the loads through a hierarchy of weathering and land–ocean export models. We investigate their impacts for the oceanic biological production and air–sea carbon flux. Finally, we assess the potential incorporation of the framework in an Earth system model.
Patrick A. Rafter, Aaron Bagnell, Dario Marconi, and Timothy DeVries
Biogeosciences, 16, 2617–2633, https://doi.org/10.5194/bg-16-2617-2019, https://doi.org/10.5194/bg-16-2617-2019, 2019
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The N isotopic composition of nitrate (
nitrate δ15N) is a useful tracer of ocean N cycling and many other ocean processes. Here, we use a global compilation of marine nitrate δ15N as an input, training, and validating dataset for an artificial neural network (a.k.a.,
machine learning) and examine basin-scale trends in marine nitrate δ15N from the surface to the seafloor.
Elena Terzić, Paolo Lazzari, Emanuele Organelli, Cosimo Solidoro, Stefano Salon, Fabrizio D'Ortenzio, and Pascal Conan
Biogeosciences, 16, 2527–2542, https://doi.org/10.5194/bg-16-2527-2019, https://doi.org/10.5194/bg-16-2527-2019, 2019
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Measuring ecosystem properties in the ocean is a hard business. Recent availability of data from Biogeochemical-Argo floats can help make this task easier. Numerical models can integrate these new data in a coherent picture and can be used to investigate the functioning of ecosystem processes. Our new approach merges experimental information and model capabilities to quantitatively demonstrate the importance of light and water vertical mixing for algae dynamics in the Mediterranean Sea.
Jens Terhaar, James C. Orr, Marion Gehlen, Christian Ethé, and Laurent Bopp
Biogeosciences, 16, 2343–2367, https://doi.org/10.5194/bg-16-2343-2019, https://doi.org/10.5194/bg-16-2343-2019, 2019
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A budget of anthropogenic carbon in the Arctic Ocean, the main driver of open-ocean acidification, was constructed for the first time using a high-resolution ocean model. The budget reveals that anthropogenic carbon enters the Arctic Ocean mainly by lateral transport; the air–sea flux plays a minor role. Coarser-resolution versions of the same model, typical of earth system models, store less anthropogenic carbon in the Arctic Ocean and thus underestimate ocean acidification in the Arctic Ocean.
Taylor S. Martin, François Primeau, and Karen L. Casciotti
Biogeosciences, 16, 347–367, https://doi.org/10.5194/bg-16-347-2019, https://doi.org/10.5194/bg-16-347-2019, 2019
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Nitrite is a key intermediate in many nitrogen (N) cycling processes in the ocean, particularly in areas with low oxygen that are hotspots for N loss. We have created a 3-D global N cycle model with nitrite as a tracer. Stable isotopes of N are also included in the model and we are able to model the isotope fractionation associated with each N cycling process. Our model accurately represents N concentrations and isotope distributions in the ocean.
Camille Richon, Jean-Claude Dutay, Laurent Bopp, Briac Le Vu, James C. Orr, Samuel Somot, and François Dulac
Biogeosciences, 16, 135–165, https://doi.org/10.5194/bg-16-135-2019, https://doi.org/10.5194/bg-16-135-2019, 2019
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We evaluate the effects of climate change and biogeochemical forcing evolution on the nutrient and plankton cycles of the Mediterranean Sea for the first time. We use a high-resolution coupled physical and biogeochemical model and perform 120-year transient simulations. The results indicate that changes in external nutrient fluxes and climate change may have synergistic or antagonistic effects on nutrient concentrations, depending on the region and the scenario.
Prima Anugerahanti, Shovonlal Roy, and Keith Haines
Biogeosciences, 15, 6685–6711, https://doi.org/10.5194/bg-15-6685-2018, https://doi.org/10.5194/bg-15-6685-2018, 2018
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Minor changes in the biogeochemical model equations lead to major dynamical changes. We assessed this structural sensitivity for the MEDUSA biogeochemical model on chlorophyll and nitrogen concentrations at five oceanographic stations over 10 years, using 1-D ensembles generated by combining different process equations. The ensemble performed better than the default model in most of the stations, suggesting that our approach is useful for generating a probabilistic biogeochemical ensemble model.
Audrey Gimenez, Melika Baklouti, Thibaut Wagener, and Thierry Moutin
Biogeosciences, 15, 6573–6589, https://doi.org/10.5194/bg-15-6573-2018, https://doi.org/10.5194/bg-15-6573-2018, 2018
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During the OUTPACE cruise conducted in the oligotrophic to ultra-oligotrophic region of the western tropical South Pacific, two contrasted regions were sampled in terms of N2 fixation rates, primary production rates and nutrient availability. The aim of this work was to investigate the role of N2 fixation in the differences observed between the two contrasted areas by comparing two simulations only differing by the presence or not of N2 fixers using a 1-D biogeochemical–physical coupled model.
Jenny Hieronymus, Kari Eilola, Magnus Hieronymus, H. E. Markus Meier, Sofia Saraiva, and Bengt Karlson
Biogeosciences, 15, 5113–5129, https://doi.org/10.5194/bg-15-5113-2018, https://doi.org/10.5194/bg-15-5113-2018, 2018
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This paper investigates how phytoplankton concentrations in the Baltic Sea co-vary with nutrient concentrations and other key variables on inter-annual timescales in a model integration over the years 1850–2008. The study area is not only affected by climate change; it has also been subjected to greatly increased nutrient loads due to extensive use of agricultural fertilizers. The results indicate the largest inter-annual coherence of phytoplankton with the limiting nutrient.
Cyril Dutheil, Olivier Aumont, Thomas Gorguès, Anne Lorrain, Sophie Bonnet, Martine Rodier, Cécile Dupouy, Takuhei Shiozaki, and Christophe Menkes
Biogeosciences, 15, 4333–4352, https://doi.org/10.5194/bg-15-4333-2018, https://doi.org/10.5194/bg-15-4333-2018, 2018
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N2 fixation is recognized as one of the major sources of nitrogen in the ocean. Thus, N2 fixation sustains a significant part of the primary production (PP) by supplying the most common limiting nutrient for phytoplankton growth. From numerical simulations, the local maximums of Trichodesmium biomass in the Pacific are found around islands, explained by the iron fluxes from island sediments. We assessed that 15 % of the PP may be due to Trichodesmium in the low-nutrient, low-chlorophyll areas.
Akitomo Yamamoto, Ayako Abe-Ouchi, and Yasuhiro Yamanaka
Biogeosciences, 15, 4163–4180, https://doi.org/10.5194/bg-15-4163-2018, https://doi.org/10.5194/bg-15-4163-2018, 2018
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Millennial-scale changes in oceanic CO2 uptake due to global warming are simulated by a GCM and offline biogeochemical model. Sensitivity studies show that decreases in oceanic CO2 uptake are mainly caused by a weaker biological pump and seawater warming. Enhanced CO2 uptake due to weaker equatorial upwelling cancels out reduced CO2 uptake due to weaker AMOC and AABW formation. Thus, circulation change plays only a small direct role in reduction of CO2 uptake due to global warming.
Fabian A. Gomez, Sang-Ki Lee, Yanyun Liu, Frank J. Hernandez Jr., Frank E. Muller-Karger, and John T. Lamkin
Biogeosciences, 15, 3561–3576, https://doi.org/10.5194/bg-15-3561-2018, https://doi.org/10.5194/bg-15-3561-2018, 2018
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Seasonal patterns in nanophytoplankton and diatom biomass in the Gulf of Mexico were examined with an ocean–biogeochemical model. We found silica limitation of model diatom growth in the deep GoM and Mississippi delta. Zooplankton grazing and both transport and vertical mixing of biomass substantially influence the model phytoplankton biomass seasonality. We stress the need for integrated analyses of biologically and physically driven biomass fluxes to describe phytoplankton seasonal changes.
Martí Galí, Maurice Levasseur, Emmanuel Devred, Rafel Simó, and Marcel Babin
Biogeosciences, 15, 3497–3519, https://doi.org/10.5194/bg-15-3497-2018, https://doi.org/10.5194/bg-15-3497-2018, 2018
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We developed a new algorithm to estimate the sea-surface concentration of dimethylsulfide (DMS) using satellite data. DMS is a gas produced by marine plankton that, once emitted to the atmosphere, plays a key climatic role by seeding cloud formation. We used the algorithm to produce global DMS maps and also regional DMS time series. The latter suggest that DMS can vary largely from one year to another, which should be taken into account in atmospheric studies.
Konstantin Stolpovsky, Andrew W. Dale, and Klaus Wallmann
Biogeosciences, 15, 3391–3407, https://doi.org/10.5194/bg-15-3391-2018, https://doi.org/10.5194/bg-15-3391-2018, 2018
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The paper describes a new way to parameterize G-type models in marine sediments using data about reactivity of organic carbon sinking to the seafloor.
Anne Marx, Marcus Conrad, Vadym Aizinger, Alexander Prechtel, Robert van Geldern, and Johannes A. C. Barth
Biogeosciences, 15, 3093–3106, https://doi.org/10.5194/bg-15-3093-2018, https://doi.org/10.5194/bg-15-3093-2018, 2018
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CO2 outgassing from small streams causes one of the main uncertainties in global carbon budgets. These are caused by variable flow conditions, changing stream surface areas, and groundwater seeps. Here we used groundwater data to improve a novel stable carbon isotope modelling approach. We found that CO2 outgassing contributed more than three-fourths of annual stream inorganic carbon loss in a small, silicate catchment. We underline the potential of this approach for global applications.
Malin Ödalen, Jonas Nycander, Kevin I. C. Oliver, Laurent Brodeau, and Andy Ridgwell
Biogeosciences, 15, 1367–1393, https://doi.org/10.5194/bg-15-1367-2018, https://doi.org/10.5194/bg-15-1367-2018, 2018
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We conclude that different initial states for an ocean model result in different capacities for ocean carbon storage due to differences in the ocean circulation state and the origin of the carbon in the initial ocean carbon reservoir. This could explain why it is difficult to achieve comparable responses of the ocean carbon system in model inter-comparison studies in which the initial states vary between models. We show that this effect of the initial state is quantifiable.
Johan van der Molen, Piet Ruardij, Karen Mooney, Philip Kerrison, Nessa E. O'Connor, Emma Gorman, Klaas Timmermans, Serena Wright, Maeve Kelly, Adam D. Hughes, and Elisa Capuzzo
Biogeosciences, 15, 1123–1147, https://doi.org/10.5194/bg-15-1123-2018, https://doi.org/10.5194/bg-15-1123-2018, 2018
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Macroalgae farming may provide biofuel. Modelled macroalgae production is given for four sites in UK and Dutch waters. Macroalgae growth depended on nutrient concentrations and light levels. Macroalgae carbohydrate content, important for biofuel use, was lower for high nutrient concentrations. The hypothetical large-scale farm off the UK north Norfolk coast gave high, stable yields of macroalgae from year to year with substantial carbohydrate content.
Daniel E. Kaufman, Marjorie A. M. Friedrichs, John C. P. Hemmings, and Walker O. Smith Jr.
Biogeosciences, 15, 73–90, https://doi.org/10.5194/bg-15-73-2018, https://doi.org/10.5194/bg-15-73-2018, 2018
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Computer simulations of the highly variable phytoplankton in the Ross Sea demonstrated how incorporating data from different sources (satellite, ship, or glider) results in different system interpretations. For example, simulations assimilating satellite-based data produced lower carbon export estimates. Combining observations with models in this remote, harsh, and biologically variable environment should include consideration of the potential impacts of data frequency, duration, and coverage.
Karin F. Kvale and Katrin J. Meissner
Biogeosciences, 14, 4767–4780, https://doi.org/10.5194/bg-14-4767-2017, https://doi.org/10.5194/bg-14-4767-2017, 2017
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Climate models containing ocean biogeochemistry contain a lot of poorly constrained parameters, which makes model tuning difficult. For more than 20 years modellers have generally assumed phytoplankton light attenuation parameter value choice has an insignificant affect on model ocean primary production; thus, it is often overlooked for tuning. We show that an empirical range of light attenuation parameter values can affect primary production, with increasing sensitivity under climate change.
Cited articles
Al-Najjar, T., Badran, M. I., Richter, C., Meyerhoefer, M., and Sommer, U.:
Seasonal dynamics of phytoplankton in the Gulf of Aqaba, Red
Sea, Hydrobiologia, 579, 69–83, 2007.
Amon, R. M. W. and Benner, R.: Photochemical and microbial consumption of
dissolved organic carbon and dissolved oxygen in the Amazon River system,
Geochim. Cosmochim. Ac., 60, 1783–1792, 1996.
Badran, M. I., Rasheed, M., Manasrah, R., and Al-Najjar, T.: Nutrient flux
fuels the summer primary productivity in the oligotrophic waters of the Gulf
of Aqaba, Red Sea, Oceanologia, 47, 47–60,
2005.
Benavides, M., Berthelot, H., Duhamel, S., Raimbault, P., and Bonnet, S.:
Dissolved organic matter uptake by Trichodesmium in the Southwest
Pacific, Sci. Rep., 7, 41315, https://doi.org/10.1038/srep41315, 2017.
Benavides, M., Bonnet, S., Berman-Frank, I., and Riemann, L.: Deep Into
Oceanic N2 Fixation, Front. Mar. Sci., 5, 1–4, https://doi.org/10.3389/fmars.2018.00108, 2018.
Ben-Sasson, M., Brenner, S., and Paldor, N.: Estimating air–sea heat fluxes
in semienclosed basins: The case of the Gulf of Elat (Aqaba), J. Phys.
Oceanogr., 39, 185–202, 2009.
Berman, T., Paldor, N., and Brenner, S.: Simulation of wind-driven
circulation in the Gulf of Elat (Aqaba), J. Mar. Syst., 26, 349–365.
https://doi.org/10.1016/S0924-7963(00)00045-2, 2000.
Berman, T., Paldor, N., and Brenner, S.: The seasonality of tidal circulation
in the Gulf of Elat, Isr. J. Earth Sci., 52, 11–19, 2003.
Berman-Frank, I., Cullen, J. T., Shaked, Y., Sherrell, R. M., and Falkowski,
P. G.: Iron availability, cellular iron quotas, and nitrogen fixation in
Trichodesmium, Limnol. Oceanogr., 46, 1249–1260, 2001.
Bissett, W. P., Walsh, J. J., Dieterle, D. A., and Carder, K. L.: Carbon
cycling in the upper waters of the Sargasso Sea: I. Numerical simulation of
differential carbon and nitrogen fluxes, Deep-Sea Res. Pt. I, 46, 205–269,
1999.
Biton, E. and Gildor, H.: The general circulation of the Gulf of Aqaba (Gulf
of Eilat) revisited: The interplay between the exchange flow through the
Straits of Tiran and surface fluxes, J. Geophys. Res., 116, 1–15, https://doi.org/10.1029/2010JC006860, 2011.
Biton, E., Silverman, J., and Gildor, H.: Observations and modeling of a
pulsating density current, Geophys. Res. Lett., 35, 1–5, https://doi.org/10.1029/2008GL034123, 2008.
Bonnet, S., Dekaezemacker, J., Turk-Kubo, K. A., Moutin, T., Hamersley, R. M.,
Grosso, O., Zehr, J. P., and Capone, D. G.: Aphotic N2 fixation in the
eastern tropical South Pacific Ocean, PloS one, 8, e81265, https://doi.org/10.1371/journal.pone.0081265, 2013.
Bonnet, S., Bethelot, H., Turk-Kubo, K., Fawcett, S., Rahav, E., L'Helguen,
S., and Berman-Frank, I.: Dynamics of N2 fixation and fate of
diazotroph-derived nitrogen in a low-nutrient, low-chlorophyll ecosystem:
results from the VAHINE mesocosm experiment (New Caledonia), Biogeosciences,
13, 2653–2673, https://doi.org/10.5194/bg-13-2653-2016, 2016.
Breitbarth, E., Oschlies, A., and LaRoche, J.: Physiological constraints on
the global distribution of Trichodesmium – effect of temperature on
diazotrophy, Biogeosciences, 4, 53–61, https://doi.org/10.5194/bg-4-53-2007,
2007.
Burchard, H., Bolding, K., and Villarreal, M.: GOTM – a general ocean
turbulence model. Theory, applications and test cases (Technical Report No.
EUR 18745 EN), European Commission, 1999.
Burkill, P. H., Mantoura, R. F. C., and Owens, N. J. P.: Biogeochemical
cycling in the northwestern Indian Ocean: a brief overview, Deep-Sea Res. Pt.
II, 40, 643–649, 1993.
Capone, D. G. and Carpenter, E. J.: Nitrogen fixation in the marine
environment, Science, 217, 1140–1142, 1982.
Capone, D. G., Zehr, J. P., Paerl, H. W., Bergman, B., and Carpenter, E. J.:
Trichodesmium, a globally significant marine cyanobacterium,
Science, 276, 1221–1229, 1997.
Capone, D. G., Subramaniam, A., Montoya, J. P., Voss, M., Humborg, C.,
Johansen, A. M., Siefert, R. L., and Carpenter, E. J.: An extensive bloom of
the N2-fixing cyanobacterium Trichodesmium erythraeum in
the central Arabian Sea, Mar. Ecol. Prog. Ser., 172, 281–292, 1998.
Capone, D. G., Burns, J. A., Montoya, J. P., Subramaniam, A., Mahaffey, C.,
Gunderson, T., Michaels, A. F., and Carpenter, E. J.: Nitrogen fixation by
Trichodesmium spp.: An important source of new nitrogen to the
tropical and subtropical North Atlantic Ocean, Global Biogeochem. Cy., 19,
1–17, https://doi.org/10.1029/2004GB002331, 2005.
Carlson, D. F., Fredj, E., Gildor, H., Biton, E., Steinbuck, J. V.,
Monismith, S. G., and Genin, A.: Observations of tidal currents in the
northern Gulf of Eilat/Aqaba (Red Sea), J. Mar. Syst., 102, 14–28, 2012.
Carlson, D. F., Fredj, E., and Gildor, H.: The annual cycle of vertical
mixing and restratification in the Northern Gulf of Eilat/Aqaba (Red Sea)
based on high temporal and vertical resolution observations, Deep-Sea Res.
Pt.
I, 84, 1–17, 2014.
Carpenter, E. J. and McCarthy, J. J.: Nitrogen fixation and uptake of
combined nitrogenous nutrients by Oscillatoria (Trichodesmium)
thiebutii in the western Sargasso Sea, Limnol. Oceanogr., 20, 389–401, 1975.
Carpenter, E. J., Montoya, J. P., Burns, J.A., Mulholland, M. R.,
Subramaniam, A., and Capone, D. G.: Extensive bloom of a N2-fixing
diatom/cyanobacterial association in the tropical Atlantic Ocean, Mar. Ecol.
Prog. Ser., 185, 273–283, 1999.
Carpenter, E. J. and Romans, K.: Major role of the cyanobacterium
Trichodesmium in nutrient cycling in the North Atlantic Ocean,
Science, 254, 1356–1358, 1991.
Chase, Z., Paytan, A., Johnson, K. S., Street, J., and Chen, Y.: Input and
cycling of iron in the Gulf of Aqaba, Red Sea, Global Biogeochem. Cy., 20,
1–11, https://doi.org/10.1029/2005GB002646, 2006.
Chen, Y., Mills, S., Street, J., Golan, D., Post, A., Jacobson, M., and
Paytan, A.: Estimates of atmospheric dry deposition and associated input of
nutrients to Gulf of Aqaba seawater, J. Geophys. Res.-Atmos., 112,
1–14, https://doi.org/10.1029/2006JD007858, 2007.
Church, M. K., Jenkinks, Bethany D., Karl, D. M., and Zehr, J.: Vertical
distributions of nitrogen-fixing phylotypes at Stn ALOHA in the oligotrophic
North Pacific Ocean, Aquat. Microb. Ecol., 38, 3–14, 2005.
Denman, K. L.: Modelling planktonic ecosystems: parameterizing complexity,
Prog. Oceanogr., 57, 429–452, 2003.
Deutsch, C., Sigman, D. M., Gruber, N., and Dunne, J. P.: Spatial coupling of
nitrogen inputs and losses in the ocean, Nature, 445, 163–168,
https://doi.org/10.1038/nature05392, 2007.
Dutkiewicz, S., Ward, B. A., Monteiro, F. M., and Follows, M.:
Interconnection nitrogen fixers and iron in the Pacific Ocean: Theory and
numerical simulations, Global Biogeochem. Cy., 26, 1–16, https://doi.org/10.1029/2011GB004039, 2012.
Dutkiewicz, S., Morris, J., Follows, M. J., Scott, J., Levitan, O., Dyhrman,
S. T., and Berman-Frank, I.: Impact of ocean acidification on the structure
of future phytoplankton communities, Nat. Clim. Change, 5, 1002–1006, 2015.
Enríquez, S. C. M. D., Duarte, C. M., and Sand-Jensen, K. A. J.:
Patterns in decomposition rates among photosynthetic organisms: the
importance of detritus C : N : P content, Oecologia, 94, 457–471, 1993.
Eppley, R. W. and Peterson, B. J.: Particulate organic matter flux and
planktonic new production in the deep ocean, Nature, 282, 677–680, 1979.
Fahnenstiel, G. L., McCormick, M. J., Lang, G. A., Redalje, D. G., Lohrenz,
S. E., Markowitz, M., Wagoner, B., and Carrick, H. J.: Taxon-specific growth
and loss rates for dominant phytoplankton populations from the northern Gulf
of Mexico, Mar. Ecol. Prog. Ser., Oldendorf, 117, 229–239, 1995.
Falkowski, P. G.: Evolution of the nitrogen cycle and its influence on the
biological sequestration of CO2 in the ocean, Nature, 387,
272–274, 1997.
Farnelid, H., Bentzon-Tilia, M., Andersson, A. F., Bertilsson, S., Jost, G.,
Labrenz, M., Jürgens, K., and Riemann, L.: Active nitrogen-fixing
heterotrophic bacteria at and below the chemocline of the central Baltic Sea,
ISME J., 7, 1413–1423, https://doi.org/10.1038/ismej.2013.26, 2013.
Fennel, K., Losch, M., Schröter, J., and Wenzel M.: Testing a marine
ecosystem model: Sensitivity analysis and parameter optimization, J. Mar.
Syst., 28, 45–63, 2001.
Fennel, K., Spitz, Y. H., Letelier, R., and Abbott, M. R.: A deterministic
model for N2 fixation at stn. ALOHA in the subtropical North
Pacific Ocean, Deep-Sea Res. Pt. II, 49, 149–174, 2002.
Fennel, K., Follows, M., and Falkowski, P. G.: The co-evolution of the
nitrogen, carbon and oxygen cycles in the Proterozoic, Ocean. Am. J. Sci.,
305, 526–545, 2005.
Fennel, K., Wilkin, J., Levin, J., Moisan, J., O'Reilly, J. E., and
Haidvogel, D.: Nitrogen cycling in the Middle Atlantic Bight: Results from a
three-dimensional model and implications for the North Atlantic nitrogen
budget, Global Biogeochem. Cy., 20, 1–14,
https://doi.org/10.1029/2005GB002456, 2006.
Fennel, K., Brady, D., DiToro, D., Fulwiler, R. W., Gardner, W. S., Giblin,
A., McCarthy, M. J., Rao, A., Seitzinger, S., Thouvenot-Korppoo, M., and
Tobias, C.: Modeling denitrification in aquatic sediments, Biogeochemistry,
93, 159–178, 2009.
Fennel, K., Hu, J., Laurent, A., Marta-Almeida, M., and Hetland, R.:
Sensitivity of hypoxia predictions for the northern Gulf of Mexico to
sediment oxygen consumption and model nesting, J. Geophys. Res.-Ocean., 118,
990–1002, 2013.
Fernandez, C., Farías, L., and Ulloa, O.: Nitrogen fixation in
denitrified marine waters, PloS one, 6, e20539, https://doi.org/10.1371/journal.pone.0020539,
2011.
Fernández-Castro, B., Pahlow, M., Mouriño-Carballido, B.,
Marañón, E., and Oschlies, A.: Optimality-based
Trichodesmium diazotrophy in the North Atlantic subtropical gyre, J.
Plank. Res., 38, 946–963, 2016.
Foster, R. A., Paytan, A., and Zehr, J. P.: Seasonality of N2
fixation and nifH gene diversity in the Gulf of Aqaba (Red Sea), Limnol.
Oceanogr., 54, 219–233, 2009.
Fuller, N. J., West, N. J., Marie, D., Yallop, M., Rivlin, T., Post, A. F.,
and Scanlan, D. J.: Dynamics of community structure and phosphate status of
picocyanobacterial populations in the Gulf of Aqaba, Red Sea, Limnol.
Oceanogr., 50, 363–375, 2005.
Garcia, H. E. and Gordon, L. I.: Oxygen solubility in seawater: Better
fitting equations, Limnol. Oceanogr., 37, 1307–1312, 1992.
Geider, R. J., MacIntyre, H. L., and Kana, T. M.: Dynamic model of
phytoplankton growth and acclimation: responses of the balanced growth rate
and the chlorophyll a: carbon ratio to light, nutrient-limitation and
temperature, Mar. Ecol. Prog. Ser., 148, 187–200, 1997.
Genin, A. and Paldor, N.: Changes in the circulation and current spectrum
near the tip of the narrow, seasonally mixed Gulf of Elat, Isr. J. Earth.
Sci., 47, 87–92, 1998.
Gifford, D. J., Fessenden, L. M., Garrahan, P. R., and Martin, E.: Grazing by
microzooplankton and mesozooplankton in the high-latitude North Atlantic
Ocean: Spring versus summer dynamics, J. Geophys. Res.-Ocean., 100,
6665–6675, 1995.
Gordon, N., Angel, D. L., Neori, A., Kress, N., and Kimor, B.: Heterotrophic
dinoflagellates with symbiotic cyanobacteria and nitrogen limitation in the
Gulf of Aqaba, Mar. Ecol. Prog. Ser., 107,
83–88, 1994.
Gregg, W. W.: Assimilation of SeaWiFS ocean chlorophyll data into a
three-dimensional global ocean model, J. Mar. Syst., 69, 205–225, 2008.
Gruber, N. and Galloway, J. N.: An Earth-system perspective of the global
nitrogen cycle, Nature, 451, 293–296, 2008.
Gruber, N. and Sarmiento, J. L.: Global patterns of marine nitrogen fixation
and denitrification, Global Biogeochem. Cy., 11, 235–266, 1997.
Haug, G. H., Pedersen, T. F., Sigman, D. M., Calvert, Nielsen, B., and
Peterson, L. C.: Glacial/interglacial variations in production in nitrogen
fixation in the Cariaco Basin during the last 580 kyr, Paleoceanography, 13,
427–432, 1998.
Hong, H., Shen, R., Zhang, F., Wen, Z., Chang, S., Lin, W., and Shi, D.: The
complex effects of ocean acidification on the prominent N2-fixing
cyanobacterium Trichodesmium, Science, 356, 527–531, 2017.
Hood, R., Bates, N. R., Capone, D. G., and Olson, D. B.: Modeling the effect
of nitrogen fixation on carbon and nitrogen fluxes BATS, Deep-Sea Res. Pt.
II, 48, 1609–1648, 2001.
Houck, C. R., Joines, J. A., and Kay, M. G.: A genetic algorithm for function
optimization: A Matlab implementation (Technical Report No.
NCSU-IE-TR-95-09), North Carolina State University, Raleigh, NC, 1995.
Hutchins, D. A., Fu, F.-X., Zhang, Y., Warner, M. E., Feng, Y., Portune, K.,
Bernhardt, P., and Mullholland, M. R.: CO2 control of
Trichodesmium N2 fixation, photosynthesis, growth rates,
and elemental ratios: Implications for past, present, and future ocean
biogeochemistry, Limnol. Oceanogr., 52, 1293–1304, 2007.
Iluz, D.: Primary production of phytoplankton in the northern Gulf of Eilat,
Red Sea, MSc thesis, Bar-Ilan University, Ramat-Gan (in Hebrew with English
abstract), 1991.
Iluz, D., Dishon, G., Capuzzo, E., Meeder, E., Astoreca, R., Montecino, V.,
Znachor, P., Ediger, D., and Marra, J.: Short-term variability in primary
productivity during a wind-driven diatom bloom in the Gulf of Eilat (Aqaba),
Aquat. Microb. Ecol., 56, 205–215, 2009.
Israel National Monitoring Program (NMP): Refered to “Meteorological data” and “Ecological and oceanographic
data”, available at:
http://www.iui-eilat.ac.il/Research/NMPMeteoData.aspx, last access:
December 2018.
Jayakumar, A., Al-Rshaidat, M. M. D., Ward, B. B., and Mulholland, M. R.:
Diversity, distribution, and expression of diazotroph nifH genes in
oxygen-deficient waters of the Arabian Sea, FEMS Microbiol. Ecol., 82,
597–606, https://doi.org/10.1111/j.1574-6941.2012.01430.x, 2012.
Karl, D.: Nutrient dynamics in the deep blue sea, TRENDS Microbiol., 10,
410–418, 2002.
Kerbrat, A. S., Darius, H. T., Pauillac, S., Chinain, M., and Laurent, D.:
Detection of ciguatoxin-like and paralysing toxins in Trichodesmium
spp. from New Caledonia lagoon, Mar. Pollut. Bull., 61, 360–366, 2010.
Kerbrat, A. S., Amzil, Z., Pawlowiez, R., Golubic, S., Sibat, M., Darius, H.
T., Chinain, M., and Laurent, D.: First Evidence of Palytoxin and
42-Hydroxy-palytoxin in the Marine Cyanobacterium Trichodesmium,
Mar. Drugs, 9, 543–560, https://doi.org/10.3390/md9040543, 2011.
Kimor, B. and Golandsky, B.: Microplankton of the Gulf of Elat: aspects of
seasonal and bathymetric distribution, Mar. Biol., 42, 55–67, 1977.
Kimor, B., Gordon, N., and Neori, A.: Symbiotic associations among the
microplankton in oligotrophic marine environments, with special reference to
the Gulf of Aqaba, Red Sea, J. Plank. Res., 14, 1217–1231, 1992.
Klinker, J., Reiss, Z., Kropach, C., Levanon, I., Harpaz, H., Halicz, E., and
Assaf, G.: Observations on the circulation pattern in the Gulf of Elat
(Aqaba), Red Sea, Isr. J. Earth Sci., 25, 85–103, 1976.
Kranz, S. A., Levitan, O., Richter, K. U., Prášil, O., Berman-Frank,
I., and Rost, B.: Combined effects of CO2 and light on the
N2-fixing cyanobacterium Trichodesmium IMS101:
physiological responses, Plant Physiol., 154, 334–345, 2010.
Kreus, M., Schartau, M., Engel, A., Nausch, M., and Voss, M. Variations in
the elemental ratio of organic matter in the central Baltic Sea: Part I –
Linking primary production to remineralization, Cont. Shelf Res., 100,
25–45, 2015.
Kuhn, A. M., Fennel, K., and Mattern, J. P.: Model investigations of the
North Atlantic spring bloom initiation, Prog. Oceanogr., 138, 176–193, 2015.
Labiosa, R. G., Arrigo, K. R., Genin, A., Monismith, S. G., and van Dijken,
G.: The interplay between upwelling and deep convective mixing in determining
the seasonal phytoplankton dynamics in the Gulf of Aqaba: Evidence from
SeaWiFS and MODIS, Limnol. Oceanogr., 48, 2355–2368, 2003.
Landry, M. R., Hasset, R. P., Fagerness, V., Downs, J., and Lorenzen, C. J.:
Effect of food acclimation on assimilation efficiency of Calanus pacificus,
Limnol. Oceanogr., 29, 361–364, 1984.
Langlois, R., Großkopf, T., Mills, M., Takeda, S., and LaRoche, J.:
Widespread distribution and expression of Gamma A (UMB), an uncultured,
diazotrophic, γ-proteobacterial nifH phylotype, PLoS One, 10,
e0128912, https://doi.org/10.1371/journal.pone.0128912, 2015.
Lazar, B., Erez, J., Silverman, J., Rivlin, T., Rivlin, A., Dray, M., Meeder,
E., and Iluz, D.: Recent environmental changes in the chemical-biological
oceanography of the Gulf of Aqaba (Eilat), Aqaba-Eilat Improbable Gulf
Environment, Biodiversity and Preservation, Magnes Press, Jerusalem, 49–62,
2008.
Lee, K., Karl, D. M., Wanninkhof, R., and Zhang, J. Z.: Global estimates of
net carbon production in the nitrate-depleted tropical and subtropical
oceans, Geophys. Res. Lett., 29, 1–4, https://doi.org/10.1029/2001GL014198,
2002.
Levanon-Spanier, I., Padan, E., and Reiss, Z.: Primary production in a
desert-enclosed sea-the Gulf of Elat (Aqaba), Red Sea, Deep-Sea Res. Pt. I,
26, 673–685, 1979.
Levitan, O., Rosenberg, G., Setlik, I., Setlikova, E., Grigel, J., Klepetar,
J., Prasil, O., and Berman-Frank, I.: Elevated CO2 enhances
nitrogen fixation and growth in the marine cyanobacterium
Trichodesmium, Glob. Change Biol., 13, 531–538, 2007.
Lima, I. D. and Doney, S. C.: A three-dimensional, multinutrient, and
size-structured ecosystem model for the North Atlantic, Global Biogeochem.
Cy., 18, 1–21, https://doi.org/10.1029/2003GB002146, 2004.
Lindell, D. and Post, A. F.: Ultraphytoplankton succession is triggered by
deep winter mixing in the Gulf of Aqaba (Eilat), Red Sea, Limnol. Oceanogr.,
40, 1130–1141, 1995.
Loescher, C. R., Großkopf, T., Desai, F. D., Gill, D., Schunck, H.,
Croot, P. L., Schlosser, C., Neulinger, S. C., Pinnow, N., Lavik, G., and
Kuypers, M. M.: Facets of diazotrophy in the oxygen minimum zone waters off
Peru, ISME J., 8, 2180–2192, https://doi.org/10.1038/ismej.2014.71, 2014
Luo, Y.-W., Doney, S. C., Anderson, L. A., Benavides, M., Berman-Frank, I.,
Bode, A., Bonnet, S., Boström, K. H., Böttjer, D., Capone, D. G.,
Carpenter, E. J., Chen, Y. L., Church, M. J., Dore, J. E., Falcón, L. I.,
Fernández, A., Foster, R. A., Furuya, K., Gómez, F., Gundersen, K.,
Hynes, A. M., Karl, D. M., Kitajima, S., Langlois, R. J., LaRoche, J.,
Letelier, R. M., Marañón, E., McGillicuddy Jr., D. J., Moisander, P.
H., Moore, C. M., Mouriño-Carballido, B., Mulholland, M. R., Needoba, J.
A., Orcutt, K. M., Poulton, A. J., Rahav, E., Raimbault, P., Rees, A. P.,
Riemann, L., Shiozaki, T., Subramaniam, A., Tyrrell, T., Turk-Kubo, K. A.,
Varela, M., Villareal, T. A., Webb, E. A., White, A. E., Wu, J., and Zehr, J.
P.: Database of diazotrophs in global ocean: abundance, biomass and nitrogen
fixation rates, Earth Syst. Sci. Data, 4, 47–73,
https://doi.org/10.5194/essd-4-47-2012, 2012.
Mackey, K. R., Labiosa, R. G., Calhoun, M., Street, J. H., Post, A. F., and
Paytan, A.: Phosphorus availability, phytoplankton community dynamics, and
taxon-specific phosphorus status in the Gulf of Aqaba, Red Sea, Limnol.
Oceanogr., 52, 873–885, 2007.
Mackey, K. R., Rivlin, T., Grossman, A. R., Post, A. F., and Paytan, A.:
Picophytoplankton responses to changing nutrient and light regimes during a
bloom, Mar. Biol., 156, 1531–1546, 2009.
Manasrah, R., Raheed, M., and Badran, M. I.: Relationships between water
temperature, nutrients and dissolved oxygen in the northern Gulf of Aqaba,
Red Sea, Oceanologia, 48, 237–253, 2006.
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.
Michaelis, L. and Menten, M. L.: The kinetics of the inversion effect, Biochem. Z.,
49, 333–369, 1913.
Michaels, A. F., Olson, D., Sarmiento, J. L., Ammerman, J. W., Fanning, K.,
Jahnke, R., Knap, A. H., Lipschultz, F., and Prospero, J. M.: Inputs, losses
and transformations of nitrogen and phosphorus in the pelagic North Atlantic
Ocean, in: Nitrogen Cycling in the North Atlantic Ocean and Its Watersheds,
Springer, 181–226, 1996.
Moisander, P., Beinart, R. A., Hewson, I., White, A. E., Johnson, K. S.,
Carlson, C. A., Montoya, J. P., and Zehr, J. P.: Unicellular cyanobacterial
distribution broaden the oceanic N2 fixation domain, Science, 327,
1512–1514, 2010.
Moisander, P., Benavides, M., Bonnet, S., and Berman-Frank, I.: Chasing after
Non-cyanobacterial Nitrogen Fixation in Marine Pelagic Environments, Front.
Microbiol., 8, 1736, https://doi.org/10.3389/fmicb.2017.01736, 2017.
Monismith, S. G. and Genin, A.: Tides and sea level in the Gulf of Aqaba
(Eilat), J. Geophys. Res.-Ocean., 109, 1–6, https://doi.org/10.1029/2003JC002069,
2004.
Monteiro, F. M. and Follows, M. J.: On nitrogen fixation and preferential
remineralization of phosphorus, Geophys. Res. Lett., 39, L06607, https://doi.org/10.1029/2012GL050897, 2012.
Monteiro, F. M., Follows, M., and Dutkiewicz, S.: Distribution of diverse
nitrogen fixers in the global ocean, Global Biogeochem. Cy., 24,
GB3017, https://doi.org/10.1029/2009GB003731, 2010.
Montoya, J. P., Holl, C. M., Zehr, J. P., Hansen, A., Villareal, T. A., and
Capone, D. G.: High rates of N2 fixation by unicellular diazotrophs
in the oligotrophic Pacific Ocean, Nature, 420, 1027–1032, 2004.
Moore, J. K., Doney, S. C., Kleypas, J. C., Glover, D. M., and Fung, I. Y.:
An intermediate complexity marine ecosystem model for the global domain,
Deep-Sea Res. Pt. II, 49, 403–462, 2002.
Moore, J. K., Doney, S., and Lindsay, K.: Upper ocean ecosystem dynamics and
iron cycling in a global three-dimensional model, Global Biogeochem. Cy., 18,
GB4028, https://doi.org/10.1029/2004GB002220, 2004.
Morrison, J. M., Codispoti, L. A., Gaurin, S., Jones, B., Manghnani, V., and
Zheng, Z.: Seasonal variation of hydrographic and nutrient fields during the
US JGOFS Arabian Sea Process Study, Deep-Sea Res. Pt. II, 45, 2053–2101,
1998.
Morrison, J. M., Codispoti, L. A., Smith, S. L., Wishner, K., Flagg, C.,
Gardner, W. D., Gaurin, S., Naqvi, S. W. A., Manghnani, V., Prosperie, L.,
and Gundersen, J. S.: The oxygen minimum zone in the Arabian Sea during 1995,
Deep-Sea Res. Pt. II, 46, 1903–1931, 1999.
Naqvi, S. W. A.: Denitrification processes in the Arabian Sea, Proc. Indian
Acad. Sci., 103, 279–300, 1994.
Naqvi, S. W. A., Hansen, H. P., and Kureishy, T. W.: Nutrient-uptake and
regeneration ratios in the Red-Sea with reference to the nutrient budgets,
Oceanol. Acta, 9, 271–275, 1986.
Nielsen, S. L.: Size-dependent growth rates in eukaryotic and prokaryotic
algae exemplified by green algae and cyanobacteria: comparisons between
unicells and colonial growth forms, J. Plank. Res., 28, 489–498, 2006.
O'Neil, J. M. and Roman, M. R.: Ingestion of the cyanobacterium
Trichodesmium spp. by pelagic harpacticoid copepods Macrosetella,
Miracia and Oculosetella, Ecology and Morphology of Copepods, Springer,
235–240, 1994.
Pomeroy, L. R. and Wiebe, W. J.: Temperature and substrates as interactive
limiting factors for marine heterotrophic bacteria, Aquat. Microb. Ecol., 23,
187–204, 2001.
Post, A. F., Dedej, Z., Gottlieb, R., Li, H., Thomas, D. N., El-Absawi, M.,
El-Naggar, A., El-Gharabawi, M., and Sommer, U.: Spatial and temporal
distribution of Trichodesmium spp. in the stratified Gulf of Aqaba,
Red Sea, Mar. Ecol. Prog. Ser., 239, 241–250, 2002.
Rahav, E., Bar-Zeev, E., Ohayion, S., Elifantz, H., Belkin, N., Herut, B.,
Mulholland, M. R., and Berman-Frank, I. R.: Dinitrogen fixation in aphotic
oxygenated marine environments, Front. Microbiol., 4, 1–11, https://doi.org/10.3389/fmicb.2013.00227, 2013.
Rahav, E., Herut, B., Mulholland, M. R., Belkin, N., Elifantz, H., and
Berman-Frank, I.: Heterotrophic and autotrophic contribution to dinitrogen
fixation in the Gulf of Aqaba, Mar. Ecol. Prog. Ser., 522, 67–77, 2015.
Riemann, L., Farnelid, H., and Steward, G. F.: Nitrogenase genes in
non-cyanobacterial plankton: prevalence, diversity and regulation in marine
waters, Aquat. Microb. Ecol., 61, 235–247, 2010.
Rubin, M., Berman-Frank, I., and Shaked, Y.: Dust-and mineral-iron
utilization by the marine dinitrogen-fixer Trichodesmium, Nat.
Geosci., 4, 529–534, 2011.
Schartau, M. and Oschlies, A.: Simultaneous data-based optimization of a
1D-ecosystem model at three locations in the North Atlantic: Part I – Method
and parameter estimates, J. Mar. Res., 61, 765–793, 2003.
Silverman, J. and Gildor, H.: The residence time of an active versus a
passive tracer in the Gulf of Aqaba: A box model approach, J. Mar. Syst., 71,
159–170, 2008.
Smayda, T. and Bienfang, P. K.: Suspension properties of various phyletic
groups of phytoplankton and tintinnids in an oligotrophic, subtropical
system, Mar. Ecol., 4, 289–300, 1983.
Smith, E. L.: Photosynthesis in relation to light and carbon dioxide, P.
Natl. Acad. Sci. USA, 22, 504–511, 1936.
Tande, K. S. and Slagstad, D.: Assimilation efficiency in herbivorous aquatic
organisms – The potential of the ratio method using 14C and biogenic
silica as markers, Limnol. Oceanogr., 30, 1093–1099, 1985.
Torfstein, A. and Kienast, S. S.: No Correlation Between Atmospheric Dust and
Surface Ocean Chlorophyll-a in the Oligotrophic Gulf of Aqaba, Northern Red
Sea, J. Geophys. Res.-Biogeo., 123, 391–405, 2018.
Turk-Kubo, K. A., Frank, I. E., Hogan, M. E., Desnues, A., Bonnet, S., and
Zehr, J. P.: Diazotroph community succession during the VAHINE mesocosm
experiment (New Caledonia lagoon), Biogeosciences, 12, 7435–7452,
https://doi.org/10.5194/bg-12-7435-2015, 2015.
Umlauf, L., Burchard, H., and Bolding, K.: GOTM sourcecode and test case documentation Version
4.0, available at: http://gotm.netTS3, last access: December 2018.
Veldhuis, M. J. W, Timmermans, K. R., Croot, P., and van der Wagt, B.:
Picophytoplankton; a comparative study of their biochemical composition and
photosynthetic properties, J. Sea Res., 53, 7–24, 2005.
Wanninkhof, R. and McGillis, W. R.: A cubic relationship between air-sea
CO2 exchange and wind speed, Geophys. Res. Lett., 26, 1889–1892,
1999.
Ward, B. A., Friedrichs, M. A. M., Anderson, T. R., and Oschlies, A.:
Parameter optimization techniques and the problem of underdetermination in
marine biogeochemical models, J. Mar. Syst., 81, 34–43, 2010.
Ward, B. A., Dutkiewicz, S., Moore, C. M., and Follows, M.: Iron, phosphorus,
and nitrogen supply ratios define the biogeography of nitrogen fixation,
Limnol. Oceanogr., 58, 2059–2075, 2013.
Wolf-Vecht, A., Paldor, N., and Brenner, S.: Hydrographic indications of
advection/convection effects in the Gulf of Elat, Deep-Sea Res. Pt. I, 39,
1393–1401, 1992.
Yahel, G., Post, A. F., Fabricius, K., Marie, D., Vaulot, D., and Genin, A.:
Phytoplankton distribution and grazing near coral reefs, Limnol. Oceanogr.,
43, 551–563, 1998.
Zarubin, M., Lindemann, Y., and Genin, A.: The dispersion-confinement
mechanism: Phytoplankton dynamics and the spring bloom in a deeply-mixing
subtropical sea, Prog. Oceanogr., 155, 13–27, 2017.
Zehr, J. P.: Nitrogen fixation by marine cyanobacteria, Curr. Trend.
Microbiol., 19, 162–173, 2011.
Zehr, J. P. and Ward, B. B.: Nitrogen cycling in the ocean: new perspectives
on processes and paradigms, Appl. Environ. Microbiol., 68, 1015–1024, 2002.
Zehr, J. P., Mellon, M. T., and Zani, S.: New Nitrogen-Fixing Microorganisms
Detected in Oligotrophic Oceans by Amplification of Nitrogenase (nifH) Genes,
Appl. Environ. Microbiol., 64, 3444–3450, 1998.
Zehr, J. P., Carpenter, E. J., and Villareal, T. A.: New perspectives on
nitrogen-fixing microorganisms in tropical and subtropical oceans, Curr.
Trend. Microbiol., 8, 68–73, 2000.
Zehr, J. P., Waterbury, J. B., Turner, P., Montoya, J. P., Omoregie, E.,
Steward, G. F., Hansen, A., and Karl, D. M.: Unicellular cyanobacteria fix
N2 in the subtropical North Pacific Ocean, Nature, 412, 635–637,
2001.
Zehr, J. P., Bench, S. R., Carter, B. J., Hewson, I., Niazi, F., Shi, T.,
Tripp, H. J., and Affourtit, J.: Globally distributed uncultivated oceanic
N2-fixing cyanobacteria lack ocygenic photosystem II, Science, 322,
1110–1112, 2008.
Short summary
Recent studies demonstrate that marine N2 fixation can be carried out without light. However, direct measurements of N2 fixation in dark environments are relatively scarce. This study uses a model that represents biogeochemical cycles at a deep-ocean location in the Gulf of Aqaba (Red Sea). Different model versions are used to test assumptions about N2 fixers. Relaxing light limitation for marine N2 fixers improved the similarity between model results and observations of deep nitrate and oxygen.
Recent studies demonstrate that marine N2 fixation can be carried out without light. However,...
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