Articles | Volume 11, issue 17
https://doi.org/10.5194/bg-11-4839-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-11-4839-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
11 Sep 2014
Research article |
| 11 Sep 2014
The 129-iodine content of subtropical Pacific waters: impact of Fukushima and other anthropogenic 129-iodine sources
T. P. Guilderson
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, USA
Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, CA, USA
S. J. Tumey
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, USA
T. A. Brown
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, USA
K. O. Buesseler
Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
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Biogeosciences, 21, 1517–1532, https://doi.org/10.5194/bg-21-1517-2024, https://doi.org/10.5194/bg-21-1517-2024, 2024
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Biogeosciences, 21, 1191–1211, https://doi.org/10.5194/bg-21-1191-2024, https://doi.org/10.5194/bg-21-1191-2024, 2024
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Biogeosciences, 21, 1117–1133, https://doi.org/10.5194/bg-21-1117-2024, https://doi.org/10.5194/bg-21-1117-2024, 2024
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This study investigates whether northeastern North Pacific oxygen changes may be caused by surface density changes in the northwest as water moves along density horizons from the surface into the subsurface ocean. A correlation is found with a lag that about matches the travel time of water from the northwest to the northeast. Salinity is the main driver causing decadal changes in surface density, whereas salinity and temperature contribute about equally to long-term declining density trends.
Takamitsu Ito, Hernan E. Garcia, Zhankun Wang, Shoshiro Minobe, Matthew C. Long, Just Cebrian, James Reagan, Tim Boyer, Christopher Paver, Courtney Bouchard, Yohei Takano, Seth Bushinsky, Ahron Cervania, and Curtis A. Deutsch
Biogeosciences, 21, 747–759, https://doi.org/10.5194/bg-21-747-2024, https://doi.org/10.5194/bg-21-747-2024, 2024
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This study aims to estimate how much oceanic oxygen has been lost and its uncertainties. One major source of uncertainty comes from the statistical gap-filling methods. Outputs from Earth system models are used to generate synthetic observations where oxygen data are extracted from the model output at the location and time of historical oceanographic cruises. Reconstructed oxygen trend is approximately two-thirds of the true trend.
Robert W. Izett, Katja Fennel, Adam C. Stoer, and David P. Nicholson
Biogeosciences, 21, 13–47, https://doi.org/10.5194/bg-21-13-2024, https://doi.org/10.5194/bg-21-13-2024, 2024
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Biogeosciences, 20, 4857–4874, https://doi.org/10.5194/bg-20-4857-2023, https://doi.org/10.5194/bg-20-4857-2023, 2023
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Using model simulations, we show that natural and anthropogenic changes in the global climate leave a distinct fingerprint in the isotopic signatures of iron in the surface ocean. We find that these climate effects on iron isotopes are often caused by the redistribution of iron from different external sources to the ocean, due to changes in ocean currents, and by changes in algal growth, which take up iron. Thus, isotopes may help detect climate-induced changes in iron supply and algal uptake.
Chloé Baumas, Robin Fuchs, Marc Garel, Jean-Christophe Poggiale, Laurent Memery, Frédéric A. C. Le Moigne, and Christian Tamburini
Biogeosciences, 20, 4165–4182, https://doi.org/10.5194/bg-20-4165-2023, https://doi.org/10.5194/bg-20-4165-2023, 2023
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Through the sink of particles in the ocean, carbon (C) is exported and sequestered when reaching 1000 m. Attempts to quantify C exported vs. C consumed by heterotrophs have increased. Yet most of the conducted estimations have led to C demands several times higher than C export. The choice of parameters greatly impacts the results. As theses parameters are overlooked, non-accurate values are often used. In this study we show that C budgets can be well balanced when using appropriate values.
Anna Belcher, Sian F. Henley, Katharine Hendry, Marianne Wootton, Lisa Friberg, Ursula Dallman, Tong Wang, Christopher Coath, and Clara Manno
Biogeosciences, 20, 3573–3591, https://doi.org/10.5194/bg-20-3573-2023, https://doi.org/10.5194/bg-20-3573-2023, 2023
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The oceans play a crucial role in the uptake of atmospheric carbon dioxide, particularly the Southern Ocean. The biological pumping of carbon from the surface to the deep ocean is key to this. Using sediment trap samples from the Scotia Sea, we examine biogeochemical fluxes of carbon, nitrogen, and biogenic silica and their stable isotope compositions. We find phytoplankton community structure and physically mediated processes are important controls on particulate fluxes to the deep ocean.
Asmita Singh, Susanne Fietz, Sandy J. Thomalla, Nicolas Sanchez, Murat V. Ardelan, Sébastien Moreau, Hanna M. Kauko, Agneta Fransson, Melissa Chierici, Saumik Samanta, Thato N. Mtshali, Alakendra N. Roychoudhury, and Thomas J. Ryan-Keogh
Biogeosciences, 20, 3073–3091, https://doi.org/10.5194/bg-20-3073-2023, https://doi.org/10.5194/bg-20-3073-2023, 2023
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Despite the scarcity of iron in the Southern Ocean, seasonal blooms occur due to changes in nutrient and light availability. Surprisingly, during an autumn bloom in the Antarctic sea-ice zone, the results from incubation experiments showed no significant photophysiological response of phytoplankton to iron addition. This suggests that ambient iron concentrations were sufficient, challenging the notion of iron deficiency in the Southern Ocean through extended iron-replete post-bloom conditions.
Benoît Pasquier, Mark Holzer, Matthew A. Chamberlain, Richard J. Matear, Nathaniel L. Bindoff, and François W. Primeau
Biogeosciences, 20, 2985–3009, https://doi.org/10.5194/bg-20-2985-2023, https://doi.org/10.5194/bg-20-2985-2023, 2023
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Modeling the ocean's carbon and oxygen cycles accurately is challenging. Parameter optimization improves the fit to observed tracers but can introduce artifacts in the biological pump. Organic-matter production and subsurface remineralization rates adjust to compensate for circulation biases, changing the pathways and timescales with which nutrients return to the surface. Circulation biases can thus strongly alter the system’s response to ecological change, even when parameters are optimized.
Priyanka Banerjee
Biogeosciences, 20, 2613–2643, https://doi.org/10.5194/bg-20-2613-2023, https://doi.org/10.5194/bg-20-2613-2023, 2023
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This study shows that atmospheric deposition is the most important source of iron to the upper northern Indian Ocean for phytoplankton growth. This is followed by iron from continental-shelf sediment. Phytoplankton increase following iron addition is possible only with high background levels of nitrate. Vertical mixing is the most important physical process supplying iron to the upper ocean in this region throughout the year. The importance of ocean currents in supplying iron varies seasonally.
Iris Kriest, Julia Getzlaff, Angela Landolfi, Volkmar Sauerland, Markus Schartau, and Andreas Oschlies
Biogeosciences, 20, 2645–2669, https://doi.org/10.5194/bg-20-2645-2023, https://doi.org/10.5194/bg-20-2645-2023, 2023
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Global biogeochemical ocean models are often subjectively assessed and tuned against observations. We applied different strategies to calibrate a global model against observations. Although the calibrated models show similar tracer distributions at the surface, they differ in global biogeochemical fluxes, especially in global particle flux. Simulated global volume of oxygen minimum zones varies strongly with calibration strategy and over time, rendering its temporal extrapolation difficult.
John C. Tracey, Andrew R. Babbin, Elizabeth Wallace, Xin Sun, Katherine L. DuRussel, Claudia Frey, Donald E. Martocello III, Tyler Tamasi, Sergey Oleynik, and Bess B. Ward
Biogeosciences, 20, 2499–2523, https://doi.org/10.5194/bg-20-2499-2023, https://doi.org/10.5194/bg-20-2499-2023, 2023
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Nitrogen (N) is essential for life; thus, its availability plays a key role in determining marine productivity. Using incubations of seawater spiked with a rare form of N measurable on a mass spectrometer, we quantified microbial pathways that determine marine N availability. The results show that pathways that recycle N have higher rates than those that result in its loss from biomass and present new evidence for anaerobic nitrite oxidation, a process long thought to be strictly aerobic.
Amanda Gerotto, Hongrui Zhang, Renata Hanae Nagai, Heather M. Stoll, Rubens César Lopes Figueira, Chuanlian Liu, and Iván Hernández-Almeida
Biogeosciences, 20, 1725–1739, https://doi.org/10.5194/bg-20-1725-2023, https://doi.org/10.5194/bg-20-1725-2023, 2023
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Based on the analysis of the response of coccolithophores’ morphological attributes in a laboratory dissolution experiment and surface sediment samples from the South China Sea, we proposed that the thickness shape (ks) factor of fossil coccoliths together with the normalized ks variation, which is the ratio of the standard deviation of ks (σ) over the mean ks (σ/ks), is a robust and novel proxy to reconstruct past changes in deep ocean carbon chemistry.
Katherine E. Turner, Doug M. Smith, Anna Katavouta, and Richard G. Williams
Biogeosciences, 20, 1671–1690, https://doi.org/10.5194/bg-20-1671-2023, https://doi.org/10.5194/bg-20-1671-2023, 2023
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We present a new method for reconstructing ocean carbon using climate models and temperature and salinity observations. To test this method, we reconstruct modelled carbon using synthetic observations consistent with current sampling programmes. Sensitivity tests show skill in reconstructing carbon trends and variability within the upper 2000 m. Our results indicate that this method can be used for a new global estimate for ocean carbon content.
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.
Nicole M. Travis, Colette L. Kelly, Margaret R. Mulholland, and Karen L. Casciotti
Biogeosciences, 20, 325–347, https://doi.org/10.5194/bg-20-325-2023, https://doi.org/10.5194/bg-20-325-2023, 2023
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The primary nitrite maximum is a ubiquitous upper ocean feature where nitrite accumulates, but we still do not understand its formation and the co-occurring microbial processes involved. Using correlative methods and rates measurements, we found strong spatial patterns between environmental conditions and depths of the nitrite maxima, but not the maximum concentrations. Nitrification was the dominant source of nitrite, with occasional high nitrite production from phytoplankton near the coast.
Natacha Le Grix, Jakob Zscheischler, Keith B. Rodgers, Ryohei Yamaguchi, and Thomas L. Frölicher
Biogeosciences, 19, 5807–5835, https://doi.org/10.5194/bg-19-5807-2022, https://doi.org/10.5194/bg-19-5807-2022, 2022
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Compound events threaten marine ecosystems. Here, we investigate the potentially harmful combination of marine heatwaves with low phytoplankton productivity. Using satellite-based observations, we show that these compound events are frequent in the low latitudes. We then investigate the drivers of these compound events using Earth system models. The models share similar drivers in the low latitudes but disagree in the high latitudes due to divergent factors limiting phytoplankton production.
Abigale M. Wyatt, Laure Resplandy, and Adrian Marchetti
Biogeosciences, 19, 5689–5705, https://doi.org/10.5194/bg-19-5689-2022, https://doi.org/10.5194/bg-19-5689-2022, 2022
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Marine heat waves (MHWs) are a frequent event in the northeast Pacific, with a large impact on the region's ecosystems. Large phytoplankton in the North Pacific Transition Zone are greatly affected by decreased nutrients, with less of an impact in the Alaskan Gyre. For small phytoplankton, MHWs increase the spring small phytoplankton population in both regions thanks to reduced light limitation. In both zones, this results in a significant decrease in the ratio of large to small phytoplankton.
Margot C. F. Debyser, Laetitia Pichevin, Robyn E. Tuerena, Paul A. Dodd, Antonia Doncila, and Raja S. Ganeshram
Biogeosciences, 19, 5499–5520, https://doi.org/10.5194/bg-19-5499-2022, https://doi.org/10.5194/bg-19-5499-2022, 2022
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We focus on the exchange of key nutrients for algae production between the Arctic and Atlantic oceans through the Fram Strait. We show that the export of dissolved silicon here is controlled by the availability of nitrate which is influenced by denitrification on Arctic shelves. We suggest that any future changes in the river inputs of silica and changes in denitrification due to climate change will impact the amount of silicon exported, with impacts on Atlantic algal productivity and ecology.
Emily J. Zakem, Barbara Bayer, Wei Qin, Alyson E. Santoro, Yao Zhang, and Naomi M. Levine
Biogeosciences, 19, 5401–5418, https://doi.org/10.5194/bg-19-5401-2022, https://doi.org/10.5194/bg-19-5401-2022, 2022
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We use a microbial ecosystem model to quantitatively explain the mechanisms controlling observed relative abundances and nitrification rates of ammonia- and nitrite-oxidizing microorganisms in the ocean. We also estimate how much global carbon fixation can be associated with chemoautotrophic nitrification. Our results improve our understanding of the controls on nitrification, laying the groundwork for more accurate predictions in global climate models.
Zuozhu Wen, Thomas J. Browning, Rongbo Dai, Wenwei Wu, Weiying Li, Xiaohua Hu, Wenfang Lin, Lifang Wang, Xin Liu, Zhimian Cao, Haizheng Hong, and Dalin Shi
Biogeosciences, 19, 5237–5250, https://doi.org/10.5194/bg-19-5237-2022, https://doi.org/10.5194/bg-19-5237-2022, 2022
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Fe and P are key factors controlling the biogeography and activity of marine N2-fixing microorganisms. We found lower abundance and activity of N2 fixers in the northern South China Sea than around the western boundary of the North Pacific, and N2 fixation rates switched from Fe–P co-limitation to P limitation. We hypothesize the Fe supply rates and Fe utilization strategies of each N2 fixer are important in regulating spatial variability in community structure across the study area.
Claudia Eisenring, Sophy E. Oliver, Samar Khatiwala, and Gregory F. de Souza
Biogeosciences, 19, 5079–5106, https://doi.org/10.5194/bg-19-5079-2022, https://doi.org/10.5194/bg-19-5079-2022, 2022
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Given the sparsity of observational constraints on micronutrients such as zinc (Zn), we assess the sensitivities of a framework for objective parameter optimisation in an oceanic Zn cycling model. Our ensemble of optimisations towards synthetic data with varying kinds of uncertainty shows that deficiencies related to model complexity and the choice of the misfit function generally have a greater impact on the retrieval of model Zn uptake behaviour than does the limitation of data coverage.
Yoshikazu Sasai, Sherwood Lan Smith, Eko Siswanto, Hideharu Sasaki, and Masami Nonaka
Biogeosciences, 19, 4865–4882, https://doi.org/10.5194/bg-19-4865-2022, https://doi.org/10.5194/bg-19-4865-2022, 2022
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We have investigated the adaptive response of phytoplankton growth to changing light, nutrients, and temperature over the North Pacific using two physical-biological models. We compare modeled chlorophyll and primary production from an inflexible control model (InFlexPFT), which assumes fixed carbon (C):nitrogen (N):chlorophyll (Chl) ratios, to a recently developed flexible phytoplankton functional type model (FlexPFT), which incorporates photoacclimation and variable C:N:Chl ratios.
Jens Terhaar, Thomas L. Frölicher, and Fortunat Joos
Biogeosciences, 19, 4431–4457, https://doi.org/10.5194/bg-19-4431-2022, https://doi.org/10.5194/bg-19-4431-2022, 2022
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Estimates of the ocean sink of anthropogenic carbon vary across various approaches. We show that the global ocean carbon sink can be estimated by three parameters, two of which approximate the ocean ventilation in the Southern Ocean and the North Atlantic, and one of which approximates the chemical capacity of the ocean to take up carbon. With observations of these parameters, we estimate that the global ocean carbon sink is 10 % larger than previously assumed, and we cut uncertainties in half.
Natasha René van Horsten, Hélène Planquette, Géraldine Sarthou, Thomas James Ryan-Keogh, Nolwenn Lemaitre, Thato Nicholas Mtshali, Alakendra Roychoudhury, and Eva Bucciarelli
Biogeosciences, 19, 3209–3224, https://doi.org/10.5194/bg-19-3209-2022, https://doi.org/10.5194/bg-19-3209-2022, 2022
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The remineralisation proxy, barite, was measured along 30°E in the southern Indian Ocean during early austral winter. To our knowledge this is the first reported Southern Ocean winter study. Concentrations throughout the water column were comparable to observations during spring to autumn. By linking satellite primary production to this proxy a possible annual timescale is proposed. These findings also suggest possible carbon remineralisation from satellite data on a basin scale.
Zhibo Shao and Ya-Wei Luo
Biogeosciences, 19, 2939–2952, https://doi.org/10.5194/bg-19-2939-2022, https://doi.org/10.5194/bg-19-2939-2022, 2022
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Non-cyanobacterial diazotrophs (NCDs) may be an important player in fixing N2 in the ocean. By conducting meta-analyses, we found that a representative marine NCD phylotype, Gamma A, tends to inhabit ocean environments with high productivity, low iron concentration and high light intensity. It also appears to be more abundant inside cyclonic eddies. Our study suggests a niche differentiation of NCDs from cyanobacterial diazotrophs as the latter prefers low-productivity and high-iron oceans.
Coraline Leseurre, Claire Lo Monaco, Gilles Reverdin, Nicolas Metzl, Jonathan Fin, Claude Mignon, and Léa Benito
Biogeosciences, 19, 2599–2625, https://doi.org/10.5194/bg-19-2599-2022, https://doi.org/10.5194/bg-19-2599-2022, 2022
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Decadal trends of fugacity of CO2 (fCO2), total alkalinity (AT), total carbon (CT) and pH in surface waters are investigated in different domains of the southern Indian Ocean (45°S–57°S) from ongoing and station observations regularly conducted in summer over the period 1998–2019. The fCO2 increase and pH decrease are mainly driven by anthropogenic CO2 estimated just below the summer mixed layer, as well as by a warming south of the polar front or in the fertilized waters near Kerguelen Island.
Priscilla Le Mézo, Jérôme Guiet, Kim Scherrer, Daniele Bianchi, and Eric Galbraith
Biogeosciences, 19, 2537–2555, https://doi.org/10.5194/bg-19-2537-2022, https://doi.org/10.5194/bg-19-2537-2022, 2022
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This study quantifies the role of commercially targeted fish biomass in the cycling of three important nutrients (N, P, and Fe), relative to nutrients otherwise available in water and to nutrients required by primary producers, and the impact of fishing. We use a model of commercially targeted fish biomass constrained by fish catch and stock assessment data to assess the contributions of fish at the global scale, at the time of the global peak catch and prior to industrial fishing.
Rebecca Chmiel, Nathan Lanning, Allison Laubach, Jong-Mi Lee, Jessica Fitzsimmons, Mariko Hatta, William Jenkins, Phoebe Lam, Matthew McIlvin, Alessandro Tagliabue, and Mak Saito
Biogeosciences, 19, 2365–2395, https://doi.org/10.5194/bg-19-2365-2022, https://doi.org/10.5194/bg-19-2365-2022, 2022
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Dissolved cobalt is present in trace amounts in seawater and is a necessary nutrient for marine microbes. On a transect from the Alaskan coast to Tahiti, we measured seawater concentrations of dissolved cobalt. Here, we describe several interesting features of the Pacific cobalt cycle including cobalt sources along the Alaskan coast and Hawaiian vents, deep-ocean particle formation, cobalt activity in low-oxygen regions, and how our samples compare to a global biogeochemical model’s predictions.
Cited articles
Aoyama, M., Tsumune, D., and Hamajima, Y.: Distribution of 137Cs and 134Cs in the North Pacific Ocean: impacts of TEPCO Fukushima-Daiichi NPP accident, J. Radioanal. Nucl. Ch., 1–5, https://doi.org/10.1007/s10967-012-2033-2, 2012.
Aoyama, M., Uematsu, M., Tsumune, D., and Hamajima, Y.: Surface pathway of radioactive plume of TEPCO Fukushima NPP1 released 134Cs and 137Cs, Biogeosciences, 10, 3067–3078, https://doi.org/10.5194/bg-10-3067-2013, 2013.
Achim, P., Monfort, M., Le Petit, G., Gross, P., Douyesset, G., Taffary, T., Blanchard, X., and Moulin, C: Analysis of radionuclide releases from the Dai-ichi Nuclear Power Plant, Part II., Pure Appl. Geophys., https://doi.org/10.1007/s00024-012-0578-1, 2012.
Auad, G., Roemmich, D., and Gilson, J.: The California Current System in realtin to the Northeast Pacific Ocean circulation, Prog. Oceanogr., 91, 576–592, 2011.
Aydin, M., Top, Z., Fine, R. A., and Olson, D. B.: Modification of the intermediate waters: I. the northeastern subpolar Pacific, J. Geophys. Res., 103, 30924–30940, 1998.
Barkley, R. A. and Thompson, T. G.: The total iodine and iodate-iodine content of sea-water, Deep-Sea Res., 7, 24–34, 1960.
Biegaleski, S. R., Eslinger, P. W., Friese, J. A., Greenwood, L. R., Haas, D. A., Hayes, J. C., Hoffman, I., Keillor, M., Miley, H. S., and Moring M.: Analysis of data from sensitive US monitoring stations for the Fukushima Dai-ichi nuclear reactor accident, J. Environ. Radioactiv., 114, 15–21, 2012.
Broecker, W. S. and Peng, T. H.: Tracers in the Sea, ELDIGIO Press, Palisades NY, 1982.
Buesseler, K. O., Aoyama, M., and Fukasawa, M.: Impacts of the Fukushima Nuclear Power Plants on Marine Radioactivity, Environ. Sci. Technol., 45, 9931–9935, 2011.
Buesseler, K. O., Jayne, S. R., Fisher, N. S., Rypina, I. I., Baumann, H., Baumann, Z., Breier, C. F., Douglass, E. M., George, J., Macdonald, A. M., Miyamoto, H., Nishikawa, J., Pike, S. M., and Yoshida, S.: Fukushima-derived radionuclides in the ocean and biota off Japan, Proc. Natl. Acad. Sci., www.pnas.org/cgi/doi/10.1073/pnas.1120794109, 2012.
Caput, C., Camus, H., Gauthier, D., and Belot, Y.: Etude experimentale du lavage de l'iode par la pluie, Radioprotection, 28, 15–22, 1993.
Edmonds, H. N., Zhou, Z. Q., Raisbeck, G. M., Yiou, F., Kilius, L., and Edmond, J. N.: Distribution and behavior of anthropogenic 129I in water masses ventilating the North Atlantic Ocean, J. Geophys. Res., 106, 6881–6894, 2001.
Elderfield, H. and Truesdale, V. W.: On the biophilic nature of iodine in seawater, Earth Planet. Sc. Lett., 50, 105–114, 1980.
Fehn, U., Tullai-Fitzpatrick, S., Kubik, P. W., Sharma, P., Teng, R. T. D., Gove, H. E., and Elmore, D.: 129I and 36Cl concentrations in waters of the eastern Clear Lake area, California: residence times and sources ages of hydrothermal fluids, Geochim. Cosmochim. Ac., 56, 2069–2079, 1992.
Feng, M., Mitsudera, H., and Yoshikawa, Y.: Structure and variability of the Kuroshio Current in Tokara Strait, J. Phys. Oc., 30, 2257–2276, 2000.
Guilderson, T. P., Southon, J. R., and Brown, T. A.: "High-Precision" AMS-14C Results on TIRI Turbidite, Radiocarbon, 45, 75–80, 2003.
Guilderson, T. P., Roark, E. B., Quay, P. D., Flood-Page, S. R., and Moy, C.: Seawater radiocarbon evolution in the Gulf of Alaska: 2002 observations, Radiocarbon, 48, 1–15, 2006.
Hoffman, I., Korpach, E., Mekarski, P., Ungar, K., Yi, J., Zhang, W., Moring, M., Khotylev, V., and El-Jaby, A.: Fukushima event reconstruction using modeling and isotope relationships, J. Radioanal. Nucl. Ch., 296, 1091–1098, https://doi.org/10.1007/s10967-012-2124-0, 2012.
Honda, M. C., Imai, K., Nojiri, Y., Hoshi, F., Sugawara, T., and Kusakabe, M.: The biological pump in the northwestern North Pacific based on fluxes and major components of particulate matter obtained by sediment-trap experiments (1997–2000), Deep Sea Res. Pt. II, 49, 5595–5625, 2002.
Hou, X., Povinec, P. P., Zhang, L., Shi, K., Biddulph, D., Chang, C-C., Fan, Y., Gosler, R., Hou, Y., Jeskovsky, M., Jull, A. J. T., Liu, Q., Luo, M., Steier, P., and Zhou, W.: Iodine-129 in seawater offshore Fukushima: distribution, inorganic speciation, sources, and budget, Environ Sci. Tech., 47, 3091–3098, https://doi.org/10.1021/es304460k, 2013.
Ito, S. and Yasuda, I.: Characteristics of mesoscale eddies in the Kuroshio-Oyashio extension region detected from the distribution of the sea surface height anomaly, J. Phys. Oceanogr., 40, 1018–1034, 2010.
Kelley, D. E. and Van Scoy, K. A.: A basinwide estimate of vertical mixing in the upper pycnocline: Spreading of bomb tritium in the North Pacific Ocean, J. Phys. Oceanogr., 29, 1759–1771, 1999.
Kilius, L. R., Rucklidge, J. C., and Soto, C.: The dispersal of 129I from the Columbia River estuary, Nucl. Instr. Meth. Phys. Res. B, 92, 393–397, 1994.
Kobari, T., Kitamura, M., Minowa, M., Isami, H., Akamatsu, H., Kawakami, H., Matsumoto, K., Wakita, M., and Honda, M. C.: Impacts of the wintertime mesozooplankton community to downward carbon flux in the subarctic and subtropical Pacific Oceans, Deep-Sea Res. Pt. I, 81, 78–88, 2013.
Kristiansen, N. I., Stohl, A., and Wotawa, G.: Atmospheric removal times of the aerosol-bound radionuclides 137Cs and 131I measured after the Fukushima Dai-ichi nuclear accident – a constraint for air quality and climate models, Atmos. Chem. Phys., 12, 10759–10769, https://doi.org/10.5194/acp-12-10759-2012, 2012.
Lynn, R. J. and Simpson, J. J.: The California Current System: The Seasonal Variability of its Physical Characteristics, J. Geophys. Res., 92, 12947–12966, 1987.
Masson, O., Bieringer, J., Brudecki, K., Bucci, S., Cappai, M., Carvalho, F. P., Connan, O., Cosma, C., Dalheimer, A., Didier, D., Depuydt, G., De Geer, L. E., De Vismes, A., Gini, L., Groppi, F., Gudnason, K., Gurriaran, R., Hainz, D., Halldorsson, O., Hammond, D., Hanley, O., Hole, K., Homoki, Zs., Ioannidou, A., Isajenko, K., Jankovic, M., Katzlberger, C., Kettunen, M., Kierepko, R., Kontro, R., Kwakman, P. J. M., Lecomte, M., Leon Vintro, L., Leppanen, A. P., Lind, B., Lujaniene, G., McGinnity, P., McMahon, C., Mala, H., Manenti, S., Manolopoulou, M., Mattila, A., Mauring A., Mietelski, J. W., Møller, B., Nielsen, S. P., Nikolic, J., Overwater, R. M. W., Palsson, S. E., Papastefanou, C., Penev, I., Pham, M. K., Povinec, P. P., Rameback, H., Reis, M. C., Ringer, W., Rodriguez, A., Rulik, P., Saey, P. R. J., Samsonov, V., Schlosser, C., Sgorbati, G., Silobritiene, B. V., Söderström, C., Sogni, R., Solier, L., Sonck, M., Steinhauser, G., Steinkipff, T., Steinmann, P., Stoulos, S., Sykora, I., Todorovic, D., Tooloutalaie, N., Tositti, L., Tschiersch, J., Ugron, A., Vagena, E., Vargas, A., Wershofen, and Zhukova, O.: Tracking of airborne radionuclides from the damaged Fukushima Dai-ichi nuclear reactors by European networks, Environ. Sci. Technol., 45, 7670–7677, 2012.
Manley, S. L. and Lowe, C. G.: Canopy-forming kelps as California's coastal dosimeter: 131I from damaged Japanese ractor measured in Macrocystis pyrifera, Environ. Sci. Technol., 46, 3731–3736, 2012.
Michel, R., Daraoui, A., Gorny, M., Jakob, D., Sachse, R., Tosch, L., Nies, H., Goroncy, I., Hermann, J., Synal, H-A., Stocker, M., and Alfimov, V.: Iodine-129 and iodine-127 in European seawater and in precipitation from Northern Germany. Sci. Total Environment, 419, 151–169, 2012.
Miyake, Y., Matsuzaki, H., Fujiwara, T., Saito, T., Yamagata, T., Honda, M., and Muramatsu, Y.: Isotopic ratio of radioactive iodine (129I/131I) released from Fukushima Daiichi NPP accident, Geochem. J., 46, 327–333, 2012.
Moran, J., Fehn, U., and Teng., R. T. D.: Variations in 129I/127I ratios in recent marine sediments: evidence for a fossil organic component, Chem. Geol., 152, 193–203, 1998.
Moran, J., Oktay, S. D., and Santschi, P. H.: Sources of iodine and iodine 129 in rivers, Water Resour. Res., 38, 1149, https://doi.org/10.1029/2001WR00062, 2002.
Nakayama, E., Suzuki, Y., Fujiwara, K., and Kitano, Y.: Chemical analyses of seawater for trace elements, Recent progress in Japan on clean sampling and chemical speciation of trace elements, a review, Anal. Sci., 5, 129–139, 1989.
Patton, G. W.: Surface Water and Sediment Surveillance, Section 4.2 in Hanford Site Environmental Report for Calendar Year 2003, PNNL-14687, 2004.
Patton, G. W.: Surface Water and Sediment Surveillance, Section 8.4 in Hanford Site Environmental Report for Calendar Year 2009, PNNL-19455, 2009.
Povinec, P. P., Oregioni, B., Jull, A. J. T., Kieser, W. E., and Zhao, X.-L.: AMS measurements of 14C and 129I in seawater around radioactive waste dump sites, Nucl. Instr. Methods Phys. Res., B., 172, 672–678, 2000.
Povinec, P. P., Livingston, H. D., Shima, S., Aoyama, M., Gastaud, J., Goroncy, I., Hirose, K., Huynh-Ngoc, L., Ikeuchi, Y., Ito, T., La Rosa, J., Kwong, L. L. W., Lee, S-H., Moriya, H., Mulsow, S., Oregioni, B., Pettersson, H., and Togawa, O.: IAEA '97 expedition to the NW Pacific Ocean – results of oceanographic and radionuclide investigations of the water column, Deep-Sea Res. Pt. II, 50, 2607–2637, 2003.
Povinec, P. P., Lee, S.-H., Liong Wee Kwong, L., Pregioni, B., Jull, A. J. T., Kieser, W. E., Morgenstern, U., and Top, Z.: Tritium, radiocarbon, 90Sr, and 129I in the Pacific and Indian Oceans, Nucl. Instr. Meth. Phys. Res. B., 268, 1214–1218, 2010.
Povinec, P. P., Aoyama, M., Biddulph, D., Breier, R., Buesseler, K., Chang, C. C., Golser, R., Hou, X. L., Ješkovsk\accent'001y, M., Jull, A. J. T., Kaizer, J., Nakano, M., Nies, H., Palcsu, L., Papp, L., Pham, M. K., Steier, P., and Zhang, L. Y.: Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout, Biogeosciences, 10, 5481–5496, https://doi.org/10.5194/bg-10-5481-2013, 2013.
Qu, T., Mitsudera, H., and Qiu, B.: A climatological view of the Kuroshio/Oyahio system east of Japan, J. Phys. Oceanogr., 31, 2575–2589, 2001.
Reid, J. L.: Intermediate waters of the Pacific Ocean, The Johns Hopkins Oceanographic Studies, 2, 85 pp., 1965.
Reid, J. L. and Mantyla, A. W.: On the Mid-Depth Circulation of the North Pacific Ocean, J. Phys. Oceanog., 8, 946–951, 1978.
Rommenich, D. and McCallister, T.: Large scale circulation of the North Pacific Ocean, Prog. Oceanog., 22, 171–204, 1989.
Rypina, I. I., Jayne, S. R., Yoshida, S., Macdonald, A. M., Douglass, E., and Buesseler, K.: Short-term dispersal of Fukushima-derived radionuclides off Japan: modeling efforts and model-data intercomparison, Biogeosciences, 10, 4973–4990, https://doi.org/10.5194/bg-10-4973-2013, 2013.
Schnabel, C., Olive, V., Atarashi-Andoh, M., Dougans, A., Ellam, R. M., Freeman, S., Maden, C., Stocker, M., Synal, H-A., Wacker, L., and Xu, S.: 129I/127I ratios in Scottish coastal surface sea water: Geographical and temporal responses to changing emissions, Appl. Geochem., 22, 619–627, 2007.
Smith, J. N., McLaughlin, F. A., Smethie, W. M., Moran, S. B., and Lepore, K.: Iodine-129, 137Cs, and CFC-11 tracer transit time distributions in the Arctic Ocean, J. Geophys. Res., 116, C040224, https://doi.org/10.1029/2010JC006471, 2011.
Snyder, G., Aldahan, A., and Possnert, G.: Global distribution and long-term fate of anthropogenic 129I in marine and surface water reservoirs, Geochem. Geophys. Geosyst., 11, Q04010, https://doi.org/10.1029/2009GC002910, 2010.
Stark, S., Jenkins, W. J., and Doney, S. C.: Deposition and recirculation of tritium in the North Pacific Ocean, J. Geophys. Res., 109, C06009, https://doi.org/10.1029/2003JC002150, 2004.
Suzuki, T., Kabuto, S., Amano, H., and Togawa, O.: Measurement of iodine-129 in seawater collected from the Japan Sea area using accelerator mass spectrometry: Contributions of nuclear fuel reprocessing plants, Quat. Geochronol., 3, 268–275, 2008.
Suzuki, T., Minakawa, M., Amano, H., and Togawa, O.: The vertical profiles of iodine-129 in the Pacific Ocean and the Japan Sea before the routine operation of a new nuclear fuel reprocessing plant, Nucl. Instr. Meth. Phys. Res., B., 268, 1229–12231, 2010.
Suzuki, T., Otosaka, S., Kuwabara, J., Kawamura, H., and Kobayashi, T.: Iodine-129 concentration in seawater near Fukushima before and after the accident at the Fukushima Daiichi Nuclear Power Plant, Biogeosciences, 10, 3839–3847, https://doi.org/10.5194/bg-10-3839-2013, 2013.
Szidat, S., Schmidt, A., Handl, J., Jakob, D., Botsch, W., Michel, R., Synal, H.-A., Schnabel, C., Suter, M., Lopez-Gutierrez, J. M., and Städe, W.,: Iodine-129 Sample preparation, quality control and analyses of pre-nuclear materials and of natural waters from Lower Saxony, Germany, Nucl. Inst. Meth. Phys. Res. B, 172, 699–710, 2000.
Talley, L. D.: Distribution and formation of North Pacific intermediate water, J. Phys. Oceanogr., 23, 517–537, 1993.
Toyama, C., Muramatsu, Y., Uchida, Y., Igarashi, Y., Aoyama, M., and Matsuzaki, H.: Variations of 129I in the atmospheric fallout of Tokyo, Japan: 1963–2003, J. Env. Radiocativ., 113, 116–122, 2012.
Tumey, S. J., Guilderson, T. P., Brown, T. A., Broek, T., and Buesseler, K. O.: Input of 129I into the western Pacific ocean resulting from the Fukushima nuclear event, Meth. Appl. Radioanal. Chem., 296, 957–962, https://doi.org/10.1007/s10967-012-2217-9, 2013.
Uemetsu, M., Merril, J. T., Patterson, T. L., Duce, R. A., and Prospero, J. M.: Aerosol residence times and iodine gas/particle conversion over the North Pacific as determined from Chernobyl radioactivity, Geochem. J., 22, 157–163, 1988.
Zheng, J., Takata, H., Tagami, K., Aono, T., Fujita, K., and Uchida, S.: Rapid determination of total iodine in Japanese coastal seawater using SF-ICP-MS, Microchem. J., 100, 42–47, 2012.
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