Articles | Volume 10, issue 8
Biogeosciences, 10, 5481–5496, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article 15 Aug 2013
Research article | 15 Aug 2013
Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout
P. P. Povinec et al.
No articles found.
Daniel Glückman, Karin Hain, Claudia Joseph, Volker Metz, Francesca Quinto, Peter Steier, and Horst Geckeis
Saf. Nucl. Waste Disposal, 1, 153–154,
Elena Ceballos-Romero, Ken O. Buesseler, and María Villa-Alfageme
Earth Syst. Sci. Data Discuss.,
Preprint under review for ESSDShort summary
Thorium-234 is widely used for studying the removal rate of material on sinking particles from the upper ocean and for determining the downward flux of carbon. In this study, we present a compilation of the 50 years of 234Th measurements in the ocean and provide a broad overview of the character of the datasets. This provides a valuable resource useful to better understand and quantify how the contemporary oceanic carbon uptake functions and how it will change in future.
Michio Aoyama, Sabine Charmasson, Yasunori Hamajima, Celine Duffa, Daisuke Tsumune, and Yutaka Tateda
Manuscript not accepted for further reviewShort summary
Results of observations of the 3H activity concentrations at Fukushima coast showed the large effect of 3H flux through the rivers to coastal waters. The 3H activity concentration close to Fukushima accident site was significantly high compared to the 3H activity concentration in surrounding waters both north and south of the FNPP1 site and in river waters. The 3H/137Cs activity ratios in coastal waters were 1.2–2.2, which is significantly high compared to that observed just after the accident.
Michio Aoyama, Sabine Charmasson, Yasunori Hamajima, and Celine Duffa
Manuscript not accepted for further reviewShort summary
Our results showed that the dissolved radiocaesium activities were generally higher at coastal sites and decreased with distance from shore. The portion of particulate 137Cs to the total 137Cs ranged from 0.13 to 0.96. The ratio of 137Cs to 134Cs activity in organic particles did not change with distance from shore and generally remained around 1. The 137Cs / 134Cs activity ratio in seawater was estimated to be 1.074 ± 0.015 which was in good agreement with the ratio of 1.06 in core unit 1.
Zoltán Kern, Dániel Erdélyi, Polona Vreča, Ines Krajcar Bronić, István Fórizs, Tjaša Kanduč, Marko Štrok, László Palcsu, Miklós Süveges, György Czuppon, Balázs Kohán, and István Gábor Hatvani
Earth Syst. Sci. Data, 12, 2061–2073,Short summary
Here we present the spatially continuous gridded database for amount-weighted annual mean tritium activity in precipitation for the period 1976 to 2017 for the Adriatic–Pannonian region, with a special focus on the years after 2010, which are not represented by existing global models. This AP3H database is capable of providing reliable spatiotemporal input for hydrogeological applications at any place within Slovenia, Hungary, and their surroundings.
Luyuan Zhang, Xiaolin Hou, Sheng Xu, Tian Feng, Peng Cheng, Yunchong Fu, and Ning Chen
Atmos. Chem. Phys., 20, 2623–2635,Short summary
To trace the long-range transport of air pollutants and understand the atmospheric effect of iodine, the daily-resolution temporal variations of 129I and 127I in aerosols from a monsoonal city indicate the East Asian monsoon and fossil fuel combustion plays crucial roles on transport of 129I from Europe to East Asia and on elevated 127I concentrations. Through linking iodine isotopes with five major air pollutants, this study proposes the possible role of iodine in urban air pollution.
Earth Syst. Sci. Data, 12, 487–499,Short summary
A global nutrient gridded dataset that might be the basis for studies of more accurate spatial distributions of nutrients and their changes in the global ocean was created. This is an SI-traceable dataset of nitrate, phosphate, and silicate concentrations based on certified reference materials or reference materials (CRMs/RMs) of seawater nutrient concentration measurements used during many cruises by the author.
Yayoi Inomata, Michio Aoyama, Yasunori Hamajima, and Masatoshi Yamada
Ocean Sci., 14, 813–826,Short summary
Analysing increased 137Cs and 134Cs / 137Cs ratio derived from the Fukushima Nuclear Power Plant accident in the Sea of Japan and its marginal sea, we found a rapid transport process associated with subduction in the subtropical mode water (STMW) formation region and obduction in the north East China Sea. The integrated amount of FNPP1 137Cs entering the Sea of Japan until 2016 was estimated to be 0.21 ± 0.03 PBq, which corresponds to 5.1 (3.4–8.0) % of the total amount of FNPP1 137Cs in the STMW.
Shigeto Nishino, Takashi Kikuchi, Amane Fujiwara, Toru Hirawake, and Michio Aoyama
Biogeosciences, 13, 2563–2578,Short summary
We analysed mooring and ship-based data obtained from a biological hotspot in the southern Chukchi Sea. Mooring data were collected for the first time in this site and were captured during spring and autumn blooms with high chlorophyll a concentrations. The data suggest that a dome-like structure of the bottom water and nutrient regeneration at the bottom play important roles in maintaining the autumn bloom of the biological hotspot.
Luyuan Zhang, Xiaolin Hou, and Sheng Xu
Atmos. Chem. Phys., 16, 1971–1985,Short summary
Speciation analysis of long-lived anthropogenic iodine isotopes (129I) in time series Danish aerosols shows that secondary emission from heavily 129I-contaminated seawater is a major source of 129I in the Atmosphere, at least in North Europe. Iodide is the major form of water-soluble iodine, while NaOH-soluble iodine is the dominant species of iodine in aerosol, which is likely bound with organic substances. The contribution of Fukushima-derived 129I is estimated to be negligible in Europe.
E. E. Black and K. O. Buesseler
Biogeosciences, 11, 5123–5137,
T. P. Guilderson, S. J. Tumey, T. A. Brown, and K. O. Buesseler
Biogeosciences, 11, 4839–4852,
J. Kameník, H. Dulaiova, K.O. Buesseler, S. M. Pike, and K. Št'astná
Biogeosciences, 10, 6045–6052,
D. Tsumune, T. Tsubono, M. Aoyama, M. Uematsu, K. Misumi, Y. Maeda, Y. Yoshida, and H. Hayami
Biogeosciences, 10, 5601–5617,
M. L. Estapa, K. Buesseler, E. Boss, and G. Gerbi
Biogeosciences, 10, 5517–5531,
I. I. Rypina, S. R. Jayne, S. Yoshida, A. M. Macdonald, E. Douglass, and K. Buesseler
Biogeosciences, 10, 4973–4990,
N. Casacuberta, P. Masqué, J. Garcia-Orellana, R. Garcia-Tenorio, and K.O. Buesseler
Biogeosciences, 10, 3649–3659,
M. Aoyama, M. Uematsu, D. Tsumune, and Y. Hamajima
Biogeosciences, 10, 3067–3078,
M. A. Charette, C. F. Breier, P. B. Henderson, S. M. Pike, I. I. Rypina, S. R. Jayne, and K. O. Buesseler
Biogeosciences, 10, 2159–2167,
Related subject area
Biogeochemistry: Open OceanDeep chlorophyll maximum and nutricline in the Mediterranean Sea: emerging properties from a multi-platform assimilated biogeochemical model experimentPhosphorus cycling in the upper waters of the Mediterranean Sea (PEACETIME cruise): relative contribution of external and internal sourcesFast local warming is the main driver of recent deoxygenation in the northern Arabian SeaInfluence of atmospheric deposition on biogeochemical cycles in an oligotrophic ocean systemImpact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperatureComparing CLE-AdCSV applications using SA and TAC to determine the Fe-binding characteristics of model ligands in seawaterImpact of dust addition on Mediterranean plankton communities under present and future conditions of pH and temperature: an experimental overviewReviews and syntheses: Trends in primary production in the Bay of Bengal – is it at a tipping point?N2 fixation in the Mediterranean Sea related to the composition of the diazotrophic community, and impact of dust under present and future environmental conditionsIncorporating the stable carbon isotope 13C in the ocean biogeochemical component of the Max Planck Institute Earth System ModelSeasonal cycling of zinc and cobalt in the south-eastern Atlantic along the GEOTRACES GA10 sectionCarbon export and fate beneath a dynamic upwelled filament off the California coastSeasonal flux patterns and carbon transport from low oxygen eddies at the Cape Verde Ocean Observatory: lessons learned from a time series sediment trap study (2009–2016)Contrasted release of insoluble elements (Fe, Al, rare earth elements, Th, Pa) after dust deposition in seawater: a tank experiment approachSubsurface iron accumulation and rapid aluminium removal in the Mediterranean following African dust depositionOn the barium–oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snow remineralizationCompound high-temperature and low-chlorophyll extremes in the ocean over the satellite periodCan machine learning extract the mechanisms controlling phytoplankton growth from large-scale observations? – A proof-of-concept studyReviews and syntheses: The biogeochemical cycle of silicon in the modern oceanOxygen budget of the north-western Mediterranean deep- convection regionCross-basin differences in the nutrient assimilation characteristics of induced phytoplankton blooms in the subtropical Pacific watersDynamics of the deep chlorophyll maximum in the Black Sea as depicted by BGC-Argo floatsNitrate assimilation and regeneration in the Barents Sea: insights from nitrate isotopesLong distance particle transport to the central Ionian SeaAssimilating synthetic Biogeochemical-Argo and ocean colour observations into a global ocean model to inform observing system designSouthern Ocean Biogeochemical Argo detect under-ice phytoplankton growth before sea ice retreatA new intermittent regime of convective ventilation threatens the Black Sea oxygenation statusReviews and syntheses: Present, past, and future of the oxygen minimum zone in the northern Indian OceanParticulate rare earth element behavior in the North Atlantic (GEOVIDE cruise)Elevated sources of cobalt in the Arctic OceanIncrease in ocean acidity variability and extremes under increasing atmospheric CO2Can ocean community production and respiration be determined by measuring high-frequency oxygen profiles from autonomous floats?Assessing the value of biogeochemical Argo profiles versus ocean color observations for biogeochemical model optimization in the Gulf of MexicoThe Southern Annular Mode (SAM) influences phytoplankton communities in the seasonal ice zone of the Southern OceanProfiling float observation of thermohaline staircases in the western Mediterranean Sea and impact on nutrient fluxesOcean carbonate system variability in the North Atlantic Subpolar surface water (1993–2017)Characterizing the surface microlayer in the Mediterranean Sea: trace metal concentrations and microbial plankton abundanceSpatial variations in silicate-to-nitrate ratios in Southern Ocean surface waters are controlled in the short term by physics rather than biologyPhytoplankton and dimethylsulfide dynamics at two contrasting Arctic ice edgesExperiment design and bacterial abundance control extracellular H2O2 concentrations during four series of mesocosm experimentsDissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)No nitrogen fixation in the Bay of Bengal?Trends and decadal oscillations of oxygen and nutrients at 50 to 300 m depth in the equatorial and North PacificPhysical drivers of the nitrate seasonal variability in the Atlantic cold tongueCoccolithophore biodiversity controls carbonate export in the Southern OceanArctic (Svalbard islands) active and exported diatom stocks and cell health statusHow will the key marine calcifier Emiliania huxleyi respond to a warmer and more thermally variable ocean?Ideas and perspectives: Is dark carbon fixation relevant for oceanic primary production estimates?Sensitivity of ocean biogeochemistry to the iron supply from the Antarctic Ice Sheet explored with a biogeochemical modelIsotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence
Anna Teruzzi, Giorgio Bolzon, Laura Feudale, and Gianpiero Cossarini
Biogeosciences, 18, 6147–6166,Short summary
During summer, maxima of phytoplankton chlorophyll concentration (DCM) occur in the subsurface of the Mediterranean Sea and can play a relevant role in carbon sequestration into the ocean interior. A numerical model based on in situ and satellite observations provides insights into the range of DCM conditions across the relatively small Mediterranean Sea and shows a western DCM that is 25 % shallower and with a higher phytoplankton chlorophyll concentration than in the eastern Mediterranean.
Elvira Pulido-Villena, Karine Desboeufs, Kahina Djaoudi, France Van Wambeke, Stéphanie Barrillon, Andrea Doglioli, Anne Petrenko, Vincent Taillandier, Franck Fu, Tiphanie Gaillard, Sophie Guasco, Sandra Nunige, Sylvain Triquet, and Cécile Guieu
Biogeosciences, 18, 5871–5889,Short summary
We report on phosphorus dynamics in the surface layer of the Mediterranean Sea. Highly sensitive phosphate measurements revealed vertical gradients above the phosphacline. The relative contribution of diapycnal fluxes to total external supply of phosphate to the mixed layer decreased towards the east, where atmospheric deposition dominated. Taken together, external sources of phosphate contributed little to total supply, which was mainly sustained by enzymatic hydrolysis of organic phosphorus.
Zouhair Lachkar, Michael Mehari, Muchamad Al Azhar, Marina Lévy, and Shafer Smith
Biogeosciences, 18, 5831–5849,Short summary
This study documents and quantifies a significant recent oxygen decline in the upper layers of the Arabian Sea and explores its drivers. Using a modeling approach we show that the fast local warming of sea surface is the main factor causing this oxygen drop. Concomitant summer monsoon intensification contributes to this trend, although to a lesser extent. These changes exacerbate oxygen depletion in the subsurface, threatening marine habitats and altering the local biogeochemistry.
France Van Wambeke, Vincent Taillandier, Karine Desboeufs, Elvira Pulido-Villena, Julie Dinasquet, Anja Engel, Emilio Marañón, Céline Ridame, and Cécile Guieu
Biogeosciences, 18, 5699–5717,Short summary
Simultaneous in situ measurements of (dry and wet) atmospheric deposition and biogeochemical stocks and fluxes in the sunlit waters of the open Mediterranean Sea revealed complex physical and biological processes occurring within the mixed layer. Nitrogen (N) budgets were computed to compare the sources and sinks of N in the mixed layer. The transitory effect observed after a wet dust deposition impacted the microbial food web down to the deep chlorophyll maximum.
Frédéric Gazeau, France Van Wambeke, Emilio Marañón, Maria Pérez-Lorenzo, Samir Alliouane, Christian Stolpe, Thierry Blasco, Nathalie Leblond, Birthe Zäncker, Anja Engel, Barbara Marie, Julie Dinasquet, and Cécile Guieu
Biogeosciences, 18, 5423–5446,Short summary
Our study shows that the impact of dust deposition on primary production depends on the initial composition and metabolic state of the tested community and is constrained by the amount of nutrients added, to sustain both the fast response of heterotrophic prokaryotes and the delayed one of phytoplankton. Under future environmental conditions, heterotrophic metabolism will be more impacted than primary production, therefore reducing the capacity of surface waters to sequester anthropogenic CO2.
Loes J. A. Gerringa, Martha Gledhill, Indah Ardiningsih, Niels Muntjewerf, and Luis M. Laglera
Biogeosciences, 18, 5265–5289,Short summary
For 3 decades, competitive ligand exchange–adsorptive cathodic stripping voltammetry was used to estimate the Fe-binding capacity of organic matter in seawater. In this paper the performance of the competing ligands is compared through the analysis of a series of model ligands. The main finding of this paper is that the determined speciation parameters are not independent of the application, making interpretation of Fe speciation data more complex than it was thought before.
Frédéric Gazeau, Céline Ridame, France Van Wambeke, Samir Alliouane, Christian Stolpe, Jean-Olivier Irisson, Sophie Marro, Jean-Michel Grisoni, Guillaume De Liège, Sandra Nunige, Kahina Djaoudi, Elvira Pulido-Villena, Julie Dinasquet, Ingrid Obernosterer, Philippe Catala, and Cécile Guieu
Biogeosciences, 18, 5011–5034,Short summary
This paper shows that the impacts of Saharan dust deposition in different Mediterranean basins are as strong as those observed in coastal waters but differed substantially between the three tested stations, differences attributed to variable initial metabolic states. A stronger impact of warming and acidification on mineralization suggests a decreased capacity of Mediterranean surface communities to sequester CO2 following the deposition of atmospheric particles in the coming decades.
Carolin R. Löscher
Biogeosciences, 18, 4953–4963,Short summary
The Bay of Bengal (BoB) is classically seen as an ocean region with low primary production, which has been predicted to decrease even further. Here, the importance of such a trend is used to explore what could happen to the BoB's low-oxygen core waters if primary production decreases. Lower biological production leads to less oxygen loss in deeper waters by respiration; thus it could be that oxygen will not further decrease and the BoB will not become anoxic, different to other low-oxygen areas.
Céline Ridame, Julie Dinasquet, Søren Hallstrøm, Estelle Bigeard, Lasse Riemann, France Van Wambeke, Matthieu Bressac, Elvira Pulido-Villena, Vincent Taillandier, Frederic Gazeau, Antonio Tover-Sanchez, Anne-Claire Baudoux, and Cécile Guieu
Preprint under review for BGShort summary
We show that in the Mediterranean Sea spatial variability in N2 fixation is related to the diazotrophic community composition reflecting different nutrient requirements among species. Nutrient supply by Saharan dust is of great importance to diazotrophs as shown by the strong stimulation of N2 fixation after a simulated dust event under present and future climate conditions; the magnitude of stimulation depends on the degree of limitation related to the diazotrophic community composition.
Bo Liu, Katharina D. Six, and Tatiana Ilyina
Biogeosciences, 18, 4389–4429,Short summary
We incorporate a new representation of the stable carbon isotope 13C in a global ocean biogeochemistry model. The model well reproduces the present-day 13C observations. We find a recent observation-based estimate of the oceanic 13C Suess effect (the decrease in 13C/12C ratio due to uptake of anthropogenic CO2; 13CSE) possibly underestimates 13CSE by 0.1–0.26 per mil. The new model will aid in better understanding the past ocean state via comparison to 13C/12C measurements from sediment cores.
Neil J. Wyatt, Angela Milne, Eric P. Achterberg, Thomas J. Browning, Heather A. Bouman, E. Malcolm S. Woodward, and Maeve C. Lohan
Biogeosciences, 18, 4265–4280,Short summary
Using data collected during two expeditions to the South Atlantic Ocean, we investigated how the interaction between external sources and biological activity influenced the availability of the trace metals zinc and cobalt. This is important as both metals play essential roles in the metabolism and growth of phytoplankton and thus influence primary productivity of the oceans. We found seasonal changes in both processes that helped explain upper-ocean trace metal cycling.
Hannah L. Bourne, James K. B. Bishop, Elizabeth J. Connors, and Todd J. Wood
Biogeosciences, 18, 3053–3086,Short summary
To learn how the biological carbon pump works in productive coastal upwelling systems, four autonomous carbon flux explorers measured carbon flux through the twilight zone beneath an offshore-flowing filament of biologically productive water. Strikingly different particle classes dominated the carbon fluxes during successive stages of the filament evolution over 30 d. Both flux and transfer efficiency were far greater than expected, suggesting an outsized filament impact in California waters.
Gerhard Fischer, Oscar Romero, Johannes Karstensen, Nasrollah Moradi, Morten Iversen, Götz Ruhland, Marco Klann, and Arne Körtzinger
Revised manuscript accepted for BGShort summary
Low-oxygen eddies in the eastern subtropical North Atlantic can form an oasis for phytoplankton growth. Here we report on particle flux dynamics at the oligotrophic Cape Verde Ocean Observatory. We observed consistent flux patterns during the passages of low oxygen eddies. We found distinct flux peaks in late winter, clearly exceeding background fluxes. Our findings suggest that the low-oxygen eddies sequester higher organic carbon than expected for oligotrophic settings.
Matthieu Roy-Barman, Lorna Foliot, Eric Douville, Nathalie Leblond, Fréderic Gazeau, Matthieu Bressac, Thibaut Wagener, Céline Ridame, Karine Desboeufs, and Cécile Guieu
Biogeosciences, 18, 2663–2678,Short summary
The release of insoluble elements such as aluminum (Al), iron (Fe), rare earth elements (REEs), thorium (Th) and protactinium (Pa) when Saharan dust falls over the Mediterranean Sea was studied during tank experiments under present and future climate conditions. Each element exhibited different dissolution kinetics and dissolution fractions (always lower than a few percent). Changes in temperature and/or pH under greenhouse conditions lead to a lower Th release and a higher light REE release.
Matthieu Bressac, Thibaut Wagener, Nathalie Leblond, Antonio Tovar-Sánchez, Céline Ridame, Samuel Albani, Sophie Guasco, Aurélie Dufour, Stéphanie Jacquet, François Dulac, Karine Desboeufs, and Cécile Guieu
Revised manuscript accepted for BGShort summary
Phytoplankton growth is limited by the availability of iron in about 50 % of the ocean. Atmospheric deposition of desert dust represents a key source of iron. Here, we present direct observations of dust deposition in the Mediterranean Sea. A key finding is that the input of iron from dust primarily occurred in the deep ocean, while previous studies mainly focused on the surface ocean. This new insight will enable us to better represent controls on global marine productivity in models.
Stéphanie H. M. Jacquet, Dominique Lefèvre, Christian Tamburini, Marc Garel, Frédéric A. C. Le Moigne, Nagib Bhairy, and Sophie Guasco
Biogeosciences, 18, 2205–2212,Short summary
We present new data concerning the relation between biogenic barium (Baxs, a tracer of carbon remineralization at mesopelagic depths), O2 consumption and prokaryotic heterotrophic production (PHP) in the Mediterranean Sea. The purpose of this paper is to improve our understanding of the relation between Baxs, PHP and O2 and to test the validity of the Dehairs transfer function in the Mediterranean Sea. This relation has never been tested in the Mediterranean Sea.
Natacha Le Grix, Jakob Zscheischler, Charlotte Laufkötter, Cecile S. Rousseaux, and Thomas L. Frölicher
Biogeosciences, 18, 2119–2137,Short summary
Marine ecosystems could suffer severe damage from the co-occurrence of a marine heat wave with extremely low chlorophyll concentration. Here, we provide a first assessment of compound marine heat wave and low-chlorophyll events in the global ocean from 1998 to 2018. We reveal hotspots of these compound events in the equatorial Pacific and in the Arabian Sea and show that they mostly occur in summer at high latitudes and their frequency is modulated by large-scale modes of climate variability.
Christopher Holder and Anand Gnanadesikan
Biogeosciences, 18, 1941–1970,Short summary
A challenge for marine ecologists in studying phytoplankton is linking small-scale relationships found in a lab to broader relationships observed on large scales in the environment. We investigated whether machine learning (ML) could help connect these small- and large-scale relationships. ML was able to provide qualitative information about the small-scale processes from large-scale information. This method could help identify important relationships from observations in future research.
Paul J. Tréguer, Jill N. Sutton, Mark Brzezinski, Matthew A. Charette, Timothy Devries, Stephanie Dutkiewicz, Claudia Ehlert, Jon Hawkings, Aude Leynaert, Su Mei Liu, Natalia Llopis Monferrer, María López-Acosta, Manuel Maldonado, Shaily Rahman, Lihua Ran, and Olivier Rouxel
Biogeosciences, 18, 1269–1289,Short summary
Silicon is the second most abundant element of the Earth's crust. In this review, we show that silicon inputs and outputs, to and from the world ocean, are 57 % and 37 % higher, respectively, than previous estimates. These changes are significant, modifying factors such as the geochemical residence time of silicon, which is now about 8000 years and 2 times faster than previously assumed. We also update the total biogenic silica pelagic production and provide an estimate for sponge production.
Caroline Ulses, Claude Estournel, Marine Fourrier, Laurent Coppola, Fayçal Kessouri, Dominique Lefèvre, and Patrick Marsaleix
Biogeosciences, 18, 937–960,Short summary
We analyse the seasonal cycle of O2 and estimate an annual O2 budget in the north-western Mediterranean deep-convection region, using a numerical model. We show that this region acts as a large sink of atmospheric O2 and as a major source of O2 for the western Mediterranean Sea. The decrease in the deep convection intensity predicted in recent projections may have important consequences on the overall uptake of O2 in the Mediterranean Sea and on the O2 exchanges with the Atlantic Ocean.
Fuminori Hashihama, Hiroaki Saito, Taketoshi Kodama, Saori Yasui-Tamura, Jota Kanda, Iwao Tanita, Hiroshi Ogawa, E. Malcolm S. Woodward, Philip W. Boyd, and Ken Furuya
Biogeosciences, 18, 897–915,Short summary
We investigated the nutrient assimilation characteristics of deep-water-induced phytoplankton blooms across the subtropical North and South Pacific Ocean. Nutrient drawdown ratios of dissolved inorganic nitrogen to phosphate were anomalously low in the western North Pacific, likely due to the high phosphate uptake capability of low-phosphate-adapted phytoplankton. The anomalous phosphate uptake might influence the maintenance of chronic phosphate depletion in the western North Pacific.
Florian Ricour, Arthur Capet, Fabrizio D'Ortenzio, Bruno Delille, and Marilaure Grégoire
Biogeosciences, 18, 755–774,Short summary
This paper addresses the phenology of the deep chlorophyll maximum (DCM) in the Black Sea (BS). We show that the DCM forms in March at a density level set by the winter mixed layer. It maintains this location until June, suggesting an influence of the DCM on light and nutrient profiles rather than mere adaptation to external factors. In summer, the DCM concentrates ~55 % of the chlorophyll in a 10 m layer at ~35 m depth and should be considered a major feature of the BS phytoplankton dynamics.
Robyn E. Tuerena, Joanne Hopkins, Raja S. Ganeshram, Louisa Norman, Camille de la Vega, Rachel Jeffreys, and Claire Mahaffey
Biogeosciences, 18, 637–653,Short summary
The Barents Sea is a rapidly changing shallow sea within the Arctic. Here, nitrate, an essential nutrient, is fully consumed by algae in surface waters during summer months. Nitrate is efficiently regenerated in the Barents Sea, and there is no evidence for nitrogen loss from the sediments by denitrification, which is prevalent on other Arctic shelves. This suggests that nitrogen availability in the Barents Sea is largely determined by the supply of nutrients in water masses from the Atlantic.
Léo Berline, Andrea Michelangelo Doglioli, Anne Petrenko, Stéphanie Barrillon, Boris Espinasse, Frederic A. C. Le Moigne, François Simon-Bot, Melilotus Thyssen, and François Carlotti
Revised manuscript accepted for BGShort summary
While Ionian Sea is considered as a nutrient depleted and low phytoplankton biomass area, it is a crossroad for water mass circulation. In the central Ionian Sea, we observed a strong contrast in particle distribution across a relatively short distance. Using remote sensing and Lagrangian simulations, we suggest that this contrast originate from long distance transport of particles from the north, west and east of Ionian Sea, where phytoplankton production was more intense.
Biogeosciences, 18, 509–534,Short summary
Biogeochemical-Argo floats are starting to routinely measure ocean chlorophyll, nutrients, oxygen, and pH. This study generated synthetic observations representing two potential Biogeochemical-Argo observing system designs and created a data assimilation scheme to combine them with an ocean model. The proposed system of 1000 floats brought clear benefits to model results, with additional floats giving further benefit. Existing satellite ocean colour observations gave complementary information.
Mark Hague and Marcello Vichi
Biogeosciences, 18, 25–38,Short summary
This paper examines the question of what causes the rapid spring growth of microscopic marine algae (phytoplankton) in the ice-covered ocean surrounding Antarctica. One prominent hypothesis proposes that the melting of sea ice is the primary cause, while our results suggest that this is only part of the explanation. In particular, we show that phytoplankton are able to start growing before the sea ice melts appreciably, much earlier than previously thought.
Arthur Capet, Luc Vandenbulcke, and Marilaure Grégoire
Biogeosciences, 17, 6507–6525,Short summary
The Black Sea is 2000 m deep, but, due to limited ventilation, only about the upper 100 m contains enough oxygen to support marine life such as fish. This oxygenation depth has been shown to be decreasing (1955–2019). Here, we evidence that atmospheric warming induced a clear shift in an important ventilation mechanism. We highlight the impact of this shift on oxygenation. There are important implications for marine life and carbon and nutrient cycling if this new ventilation regime persists.
Tim Rixen, Greg Cowie, Birgit Gaye, Joaquim Goes, Helga do Rosário Gomes, Raleigh R. Hood, Zouhair Lachkar, Henrike Schmidt, Joachim Segschneider, and Arvind Singh
Biogeosciences, 17, 6051–6080,Short summary
The northern Indian Ocean hosts an extensive oxygen minimum zone (OMZ), which intensified due to human-induced global changes. This includes the occurrence of anoxic events on the Indian shelf and affects benthic ecosystems and the pelagic ecosystem structure in the Arabian Sea. Consequences for biogeochemical cycles are unknown, which, in addition to the poor representation of mesoscale features, reduces the reliability of predictions of the future OMZ development in the northern Indian Ocean.
Marion Lagarde, Nolwenn Lemaitre, Hélène Planquette, Mélanie Grenier, Moustafa Belhadj, Pascale Lherminier, and Catherine Jeandel
Biogeosciences, 17, 5539–5561,
Randelle M. Bundy, Alessandro Tagliabue, Nicholas J. Hawco, Peter L. Morton, Benjamin S. Twining, Mariko Hatta, Abigail E. Noble, Mattias R. Cape, Seth G. John, Jay T. Cullen, and Mak A. Saito
Biogeosciences, 17, 4745–4767,Short summary
Cobalt (Co) is an essential nutrient for ocean microbes and is scarce in most areas of the ocean. This study measured Co concentrations in the Arctic Ocean for the first time and found that Co levels are extremely high in the surface waters of the Canadian Arctic. Although the Co primarily originates from the shelf, the high concentrations persist throughout the central Arctic. Co in the Arctic appears to be increasing over time and might be a source of Co to the North Atlantic.
Friedrich A. Burger, Jasmin G. John, and Thomas L. Frölicher
Biogeosciences, 17, 4633–4662,Short summary
Ensemble simulations of an Earth system model reveal that ocean acidity extremes have increased in the past few decades and are projected to increase further in terms of frequency, intensity, duration, and volume extent. The increase is not only caused by the long-term ocean acidification due to the uptake of anthropogenic CO2, but also due to changes in short-term variability. The increase in ocean acidity extremes may enhance the risk of detrimental impacts on marine organisms.
Christopher Gordon, Katja Fennel, Clark Richards, Lynn K. Shay, and Jodi K. Brewster
Biogeosciences, 17, 4119–4134,Short summary
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,Short summary
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.
Bruce L. Greaves, Andrew T. Davidson, Alexander D. Fraser, John P. McKinlay, Andrew Martin, Andrew McMinn, and Simon W. Wright
Biogeosciences, 17, 3815–3835,Short summary
We observed that variation in the Southern Annular Mode (SAM) over 11 years showed a relationship with the species composition of hard-shelled phytoplankton in the seasonal ice zone (SIZ) of the Southern Ocean. Phytoplankton in the SIZ are productive during the southern spring and summer when the area is ice-free, with production feeding most Antarctic life. The SAM is known to be increasing with climate change, and changes in phytoplankton in the SIZ may have implications for higher life forms.
Vincent Taillandier, Louis Prieur, Fabrizio D'Ortenzio, Maurizio Ribera d'Alcalà, and Elvira Pulido-Villena
Biogeosciences, 17, 3343–3366,Short summary
This study addresses the role played by vertical diffusion in the nutrient enrichment of the Levantine intermediate waters, a process particularly relevant inside thermohaline staircases. Thanks to a high profiling frequency over a 4-year period, BGC-Argo float observations reveal the temporal continuity of the layering patterns encountered during the cruise PEACETIME and their impact on vertical and lateral transfers of nitrate between the deep reservoir and the surface productive zone.
Coraline Leseurre, Claire Lo Monaco, Gilles Reverdin, Nicolas Metzl, Jonathan Fin, Solveig Olafsdottir, and Virginie Racapé
Biogeosciences, 17, 2553–2577,Short summary
In this study, we investigate the evolution of CO2 uptake and ocean acidification in the North Atlantic Subpolar surface water. Our results show an important reduction in the capacity of the ocean to absorb CO2 from the atmosphere (1993–2007), due to a rapid increase in the fCO2 and associated with a rapid decrease in pH. Conversely, data obtained during the last decade (2008–2017) show a stagnation of fCO2 (increasing the ocean sink for CO2) and pH.
Antonio Tovar-Sánchez, Araceli Rodríguez-Romero, Anja Engel, Birthe Zäncker, Franck Fu, Emilio Marañón, María Pérez-Lorenzo, Matthieu Bressac, Thibaut Wagener, Sylvain Triquet, Guillaume Siour, Karine Desboeufs, and Cécile Guieu
Biogeosciences, 17, 2349–2364,Short summary
Residence times of particulate metals derived from aerosol deposition in the Sea Surface Microlayer of the Mediterranean Sea ranged from a couple of minutes (e.g., for Fe) to a few hours (e.g., for Cu). Microbial activity seems to play an important role in in this process and in the concentration and distribution of metals between diferent water layers.
Pieter Demuynck, Toby Tyrrell, Alberto Naveira Garabato, Mark Christopher Moore, and Adrian Peter Martin
Biogeosciences, 17, 2289–2314,Short summary
The availability of macronutrients N and Si is of key importance to sustain life in the Southern Ocean. N and Si are available in abundance at the southern boundary of the Southern Ocean due to constant supply from the deep ocean. In the more northern regions of the Southern Ocean, a decline in macronutrient concentration is noticed, especially strong for Si rather than N. This paper uses a simplified biogeochemical model to investigate processes responsible for this decline in concentration.
Martine Lizotte, Maurice Levasseur, Virginie Galindo, Margaux Gourdal, Michel Gosselin, Jean-Éric Tremblay, Marjolaine Blais, Joannie Charette, and Rachel Hussherr
Biogeosciences, 17, 1557–1581,Short summary
This study brings further support to the premise that the prevalence of younger and thinner icescapes over older and thicker ones in the Canadian High Arctic favors the early development of under-ice microorganisms as well as their production of the climate-relevant gas dimethylsulfide (DMS). Given the rapid rate of climate-driven changes in Arctic sea ice, our results suggest implications for the timing and magnitude of DMS pulses in the Arctic, with ramifications for climate forecasting.
Mark J. Hopwood, Nicolas Sanchez, Despo Polyviou, Øystein Leiknes, Julián Alberto Gallego-Urrea, Eric P. Achterberg, Murat V. Ardelan, Javier Aristegui, Lennart Bach, Sengul Besiktepe, Yohann Heriot, Ioanna Kalantzi, Tuba Terbıyık Kurt, Ioulia Santi, Tatiana M. Tsagaraki, and David Turner
Biogeosciences, 17, 1309–1326,Short summary
Hydrogen peroxide, H2O2, is formed naturally in sunlight-exposed water by photochemistry. At high concentrations it is undesirable to biological cells because it is a stressor. Here, across a range of incubation experiments in diverse marine environments (Gran Canaria, the Mediterranean, Patagonia and Svalbard), we determine that two factors consistently affect the H2O2 concentrations irrespective of geographical location: bacteria abundance and experiment design.
Manon Tonnard, Hélène Planquette, Andrew R. Bowie, Pier van der Merwe, Morgane Gallinari, Floriane Desprez de Gésincourt, Yoan Germain, Arthur Gourain, Marion Benetti, Gilles Reverdin, Paul Tréguer, Julia Boutorh, Marie Cheize, François Lacan, Jan-Lukas Menzel Barraqueta, Leonardo Pereira-Contreira, Rachel Shelley, Pascale Lherminier, and Géraldine Sarthou
Biogeosciences, 17, 917–943,Short summary
We investigated the spatial distribution of dissolved Fe during spring 2014, in order to understand the processes influencing the biogeochemical cycle in the North Atlantic. Our results highlighted elevated Fe close to riverine inputs at the Iberian Margin and glacial inputs at the Newfoundland and Greenland margins. Atmospheric deposition appeared to be a minor source of Fe. Convection was an important source of Fe in the Irminger Sea, which was depleted in Fe relative to nitrate.
Carolin R. Löscher, Wiebke Mohr, Hermann W. Bange, and Donald E. Canfield
Biogeosciences, 17, 851–864,Short summary
Oxygen minimum zones (OMZs) are ocean areas severely depleted in oxygen as a result of physical, chemical, and biological processes. Biologically, organic material is produced in the sea surface and exported to deeper waters, where it respires. In the Bay of Bengal (BoB), an OMZ is present, but there are traces of oxygen left. Our study now suggests that this is because one key process, nitrogen fixation, is absent in the BoB, thus preventing primary production and consecutive respiration.
Lothar Stramma, Sunke Schmidtko, Steven J. Bograd, Tsuneo Ono, Tetjana Ross, Daisuke Sasano, and Frank A. Whitney
Biogeosciences, 17, 813–831,Short summary
The influence of climate signals in the Pacific, especially the Pacific Decadal Oscillation and the North Pacific Gyre Oscillation, as well as El Niño–La Niña and an 18.6-year nodal tidal cycle on oxygen and nutrient trends is investigated. At different locations in the Pacific Ocean different climate signals dominate. Hence, not only trends related to warming but also the influence of climate signals need to be investigated to understand oxygen and nutrient changes in the ocean.
Marie-Hélène Radenac, Julien Jouanno, Christine Carine Tchamabi, Mesmin Awo, Bernard Bourlès, Sabine Arnault, and Olivier Aumont
Biogeosciences, 17, 529–545,Short summary
Satellite data and a remarkable set of in situ measurements show a main bloom of microscopic seaweed, the phytoplankton, in summer and a secondary bloom in December in the central equatorial Atlantic. They are driven by a strong vertical supply of nitrate in May–July and a shorter and moderate supply in November. In between, transport of low-nitrate water from the west explains most nitrate losses in the sunlit layer. Horizontal eddy-induced processes also contribute to seasonal nitrate removal.
Andrés S. Rigual Hernández, Thomas W. Trull, Scott D. Nodder, José A. Flores, Helen Bostock, Fátima Abrantes, Ruth S. Eriksen, Francisco J. Sierro, Diana M. Davies, Anne-Marie Ballegeer, Miguel A. Fuertes, and Lisa C. Northcote
Biogeosciences, 17, 245–263,Short summary
Coccolithophores account for a major fraction of the carbonate produced in the world's oceans. However, their contribution in the subantarctic Southern Ocean remains undocumented. We quantitatively partition calcium carbonate fluxes amongst coccolithophore species in the Australian–New Zealand sector of the Southern Ocean. We provide new insights into the importance of species other than Emiliania huxleyi in the carbon cycle and assess their possible response to projected environmental change.
Susana Agustí, Jeffrey W. Krause, Israel A. Marquez, Paul Wassmann, Svein Kristiansen, and Carlos M. Duarte
Biogeosciences, 17, 35–45,Short summary
We found that 24 % of the total diatoms community in the Arctic water column (450 m depth) was located below the photic layer. Healthy diatom communities in active spring–bloom stages remained in the photic layer. Dying diatom communities exported a large fraction of the biomass to the aphotic zone, fuelling carbon sequestration and benthic ecosystems in the Arctic. The results of the study conform to a conceptual model where diatoms grow during the bloom until silicic acid stocks are depleted.
Xinwei Wang, Feixue Fu, Pingping Qu, Joshua D. Kling, Haibo Jiang, Yahui Gao, and David A. Hutchins
Biogeosciences, 16, 4393–4409,Short summary
In this study, we examine the responses of E. huxleyi to a future warmer and more thermally variable ocean. Elevated temperatures and thermal variation have negative effects on growth rate and physiology that are especially pronounced at high temperatures, but high-frequency thermal variation may reduce the risk of extreme high-temperature events. These findings have potentially large implications for ocean productivity and marine biogeochemical cycles under a future changing climate.
Federico Baltar and Gerhard J. Herndl
Biogeosciences, 16, 3793–3799,Short summary
Around half of the global primary production (PP) is produced in the ocean. Here we quantified how much oceanic PP estimates would increase if we included the dark DIC fixation rates (which are usually excluded in the carbon-14 method) into the PP estimation. We found that the inclusion of dark DIC fixation would increase PP estimates by 5–22 %. This represents ca. 1.2 to 11 Pg C yr−1 of newly synthesized organic carbon available for the marine food web.
Renaud Person, Olivier Aumont, Gurvan Madec, Martin Vancoppenolle, Laurent Bopp, and Nacho Merino
Biogeosciences, 16, 3583–3603,Short summary
The Antarctic Ice Sheet is considered a possibly important but largely overlooked source of iron (Fe). Here we explore its fertilization capacity by evaluating the response of marine biogeochemistry to Fe release from icebergs and ice shelves in a global ocean model. Large regional impacts are simulated, leading to only modest primary production and carbon export increases at the scale of the Southern Ocean. Large uncertainties are due to low observational constraints on modeling choices.
Robyn E. Tuerena, Raja S. Ganeshram, Matthew P. Humphreys, Thomas J. Browning, Heather Bouman, and Alexander P. Piotrowski
Biogeosciences, 16, 3621–3635,Short summary
The carbon isotopes in algae can be used to predict food sources and environmental change. We explore how dissolved carbon is taken up by algae in the South Atlantic Ocean and how this affects their carbon isotope signature. We find that cell size controls isotope fractionation. We use our results to investigate how climate change may impact the carbon isotopes in algae. We suggest a shift to smaller algae in this region would decrease the carbon isotope ratio at the base of the food web.
Aarkrog, A., Baxter, M. S., Bettencourt, A. O., Bojanowski, R., Bologa, A., Charmasson, S., Cunha, I., Delfanti, R., Duran, E., Holm, E., Jeffree, R., Livingston, H. D., Mahapanyawong, S., Nies, H., Osvath, I., Pingyu, L., Povinec, P. P., Sanchez, A., Smith, J. N., and Swift, D.: A comparison of doses from 137Cs and 210Po in marine food: A major international study, J. Environ. Radioact., 34, 69–90, 1997.
Aldahan, A., Alfimov, V., and Possnert, G.: 129I anthropogenic budget: Major source and sink, Appl. Geochem., 22, 606–618, 2007.
Aoyama, M. and Hirose, K.: Artificial radionuclides database in the Pacific Ocean: HAM database, Sci. World J., 4, 200–215, 2004.
Aoyama, M., Hirose, K., and Igarashi, Y.: Re-construction and up-dating our understanding on the global weapons tests 137Cs fallout, J. Environ. Monitor., 8, 431–438, 2006.
Aoyama, M., Tsumune, D., and Hamajima, Y.: Distribution of 137Cs and 134Cs in the North Pacific Ocean: impacts of the TEPCO Fukushima-Daiichi NPP accident, J. Radioanal. Nucl. Chem., 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.
Bailly du Bois, P., Laguionie, P., Boust, D., Korsakissok, I., Didier, D., and Fievet, B.: Estimation of marine source-term following Fukushima Dai-ichi accident, J. Environ. Radioact., 114, 2–9, 2012.
Biddulph, D. L., Beck, J. W., Burr, G. S., Donahue D. J., Hatheway, A. L., and Jull, A. J. T.: Measurement of the radioisotope 129I at the NSF-Arizona AMS, Nucl. Instrum. Methods Phys. Res. B, 172, 693–698, 2000.
Bowyer, T. W., Biegalski, S. R., Cooper, M., Eslinger, P. W., Haas, D., Hayes, J. C., Miley, H. S., Strom, D. J., and Woods, V.: Elevated radioxenon detected remotely following the Fukushima nuclear accident, J. Environ. Radioact., 102, 681–687, 2011.
Buesseler, K., 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, P. Natl. Acad. Sci. USA, 109, 5984–5988, 2012.
Casacuberta, N., Masqué, P., Garcia-Orellana, J., Garcia-Tenorio, R., and Buesseler, K. O.: 90Sr and 89Sr in seawater off Japan as a consequence of the Fukushima Dai-ichi nuclear accident, Biogeosciences, 10, 3649–3659, https://doi.org/10.5194/bg-10-3649-2013, 2013.
Charette, M. A., Breier, C. F., Henderson, P. B., Pike, S. M., Rypina, I. I., Jayne, S. R., and Buesseler, K. O.: Radium-based estimates of cesium isotope transport and total direct ocean discharges from the Fukushima Nuclear Power Plant accident, Biogeosciences, 10, 2159–2167, https://doi.org/10.5194/bg-10-2159-2013, 2013.
Chino, M., Nakayama, H., Nagai, H., Terada, H., Katata, G., and Yamazawa, H.: Preliminary estimation of release amounts of 131I and 137Cs accidentally discharged from the Fukushima Daiichi nuclear power plant into the atmosphere, J. Nucl. Sci. Technol., 48, 1129–1134, 2011.
Dietze, H. and Kriest, I.: 137Cs off Fukushima Dai-ichi, Japan – model based estimates of dilution and fate, Ocean Sci., 8, 319–332, https://doi.org/10.5194/os-8-319-2012, 2012.
He, P., Aldahan, A., Possnert, G., and Hou, X.: A summary of global 129I in marine waters, Nucl. Instrum. Methods Phys. Res. B, 294, 537–541, 2013.
Hernández-Ceballos, M. A., Hong, G. H., Lozano, R. L., Kim, Y. I., Lee, H. M., Kim, S. H., Yeh, S. W., Bolívar, J. P., and Baskaran, M.: Tracking the complete revolution of surface westerlies over Northern Hemisphere using radionuclides emitted from Fukushima, Sci. Total Environ., 438, 80–85, 2012.
Hirose, K.: Fukushima Dai-ichi nuclear power plant accident: summary of regional radioactive deposition monitoring results, J. Environ. Radioact., 111, 13–17, 2012.
Honda, M., Aono, T., Aoyama, M., Hamajima, Y., Kawakami, H., Kitamura, M., Masumoto, Y., Miyazawa, Y., Takigawa, M., and Saino, T.: Dispersion of artificial caesium-134 and -137 in the Western North Pacific one month after the Fukushima accident, Geochem. J., 46, 1–9, 2012.
Hou, X. L.: Determination of 14C and 3H in reactor graphite and concrete for decommission. Appl. Rad. Isotopes, 62, 871–882, 2005.
Hou, X. L., Dahlgaard, H., and Nielsen, S. P.: Iodine-129 time series in Danish, Norwegian and Northwest Greenland coast and the Baltic Sea by seaweed, Estuar. Coast. Shelf Sci., 51, 571–584, 2000.
Hou, X. L., Dahlgaard, H., and Nielsen, S. P.: Chemical speciation analysis of 129I in seawater and a preliminary investigation to use it as a tracer for geochemical cycle study of stable iodine, Mar. Chem., 74, 145–155, 2001.
Hou, X. L., Fogh, C. L., Kučera, J., Andersson, K. G., Dahlgaard, H., and Nielsen, S. P.: Iodine-129 and Cesium-137 in Chernobyl contaminated soil and their chemical fractionation, Sci. Total Environ., 308, 97–109, 2003.
Hou, X. L., Aldahan, A., Nislen, S., Possnert, G., Nies, H., and Hedfords, J.: Speciation of 129I and 127I in seawater and implications for sources and transport pathways in North Sea, Environ. Sci. Technol., 41, 5993–5999, 2007.
Hou, X. L., Aldahan, A., Nielsen, S. P., and Possnert, G.: Time Series of 129I and 127I Speciation in Precipitation from Denmark, Environ. Sci. Technol., 43, 6522–6528, 2009a.
Hou, X. L., Hansen, V., Aldahan, A., Possnert, G., Lind, O. C., and Lujaniene, G.: A review on speciation of iodine-129 in the environmental and biological samples, Anal. Chim. Acta, 632, 181–196, 2009b.
Hou, X. L., Povinec, P. P. L. Y., Zhang, L. Y., Biddulph, D., Chang, C.-C., Fan, Y. K., Golser, R., Ješkovský, M., Jull, A. J. T., Liu, Q., Shi, K. L., Steier, P., and Zhou, W. J.: Iodine-129 in seawater offshore Fukushima: Distribution, speciation, sources, and budget, Environ. Sci. Technol., 47, 3091–3098, 2013.
IAEA, International Atomic Energy Agency: Chernobyl's Legacy: Health, Environmental and Socio-Economic Impacts, IAEA, Vienna, 2003.
IAEA, International Atomic Energy Agency: Sediment Distribution Coefficients and Concentration Factors for Biota in the Marine Environment, Technical Reports Series no. 422, IAEA, Vienna, 2004.
IAEA, International Atomic Energy Agency: Worldwide marine radioactivity studies (WOMARS), Radionuclide levels in oceans and sea, IAEA-TECDOC-1429, IAEA, Vienna 2005.
IAEA, International Atomic Energy Agency: Briefings on Fukushima nuclear accident, www.iaea.org/, 2011.
Inomata, Y., Aoyama, M., and Hirose, K.: Analysis of 50-y record of surface 137Cs concentrations in the global ocean using the HAM-global database, J. Environ. Monitor., 11, 116–125, 2009.
Inoue, M., Kofuji, H., Nagao, S., Yamamoto, M., Hamajima, Y., Yoshida, K., Fujimoto, K., Takada, T. , and Isoda, Y.: Lateral variation of 134Cs and 137Cs concentrations in surface seawater in and around the Japan Sea after the Fukushima Dai-ichi Nuclear Power Plant accident, J. Environ. Radioact., 109, 45–51, 2012a.
Inoue, M., Kofuji, H., Y. Hamajima, Y., Nagao, S., Yoshida, K., and Yamamoto, M.: 134Cs and 137Cs activities in coastal seawater along Northern Sanriku and Tsugaru Strait, northeastern Japan, after Fukushima Dai-ichi Nuclear Power Plant accident, J. Environ. Radioact., 111, 116–119, 2012b.
Ito, T., Aramaki, Kitamura, T., Otosaka, S., Suzuki, T., Togawa, O., Kobayashi, T., Senjyu, T., Chaykovskaya, E. L., Karasev, E. V., Lishavskaya, T. S., Novichkov, V. P., Tkalin, A. V., Shcherbinin, A. F., and Volkov, Y. N.: Anthropogenic radionuclides in the Japan Sea: their distributions and transport processes, J. Environ. Radioact., 68, 249–267, 2003.
JG: Japanese Government Report, http://www.kantei.go.jp/jp/Topics/2011/iaea_houkokusho.html (last access: 10 July 2012), 2011.
Kanai, Y.: Monitoring of aerosol in Tsukuba after Fukushima nuclear power plant incident in 2011, J. Environ. Radioact., 111, 33–37, 2012.
Kawamura, H., Kobayashi, T., Furuno, A., In, T., Ishikawa, Y., Nakayama, T., Shima, S., and Awaji, T.: Preliminary numerical experiments on oceanic dispersion 131I and 137Cs discharged into the ocean because of the Fukushima Dai-ichi nuclear power plant disaster, J. Nucl. Sci. Technol., 48, 1349–1356, 2011.
Levy, I., Povinec, P. P., Aoyama, M., Hirose, K., Sanchez-Cabeza, J. A., Comanducci, J.-F., Gastaud, J., Eriksson, M., Hamajima, Y., Kim, C. S., Komura, K., Osvath, I., Roos, P., and Yim, S. A.: Marine anthropogenic radiotracers in the Southern Hemisphere: New sampling and analytical strategies, Progr. Oceanogr., 89, 120–133, 2011.
Livingston, H. D. and Povinec, P. P.: Anthropogenic marine radioactivity, Ocean Coast. Manage., 43, 689–712, 2000.
Livingston, H. D. and Povinec, P. P.: A millennium perspective on the contribution of global fallout radionuclides to ocean science, Health Phys., 82, 656–668, 2002.
Lujaniené, G., Jokšas, K., Šilobritiené, B., and Morkūniené, R.: Physical and chemical characteristics of 137Cs in the Baltic Sea, Radioactiv. Environ., 8, 165–179, 2006.
Lujaniené, G., Aninkevicius, V., and Lujanas, V: Artificial radionuclides in theatmosphere over Lithuania, J. Environ. Radioact., 100, 108–119, 2009.
Masson, O., Baeza, A., 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. Holey, K. Homoki, Zs., Ioannidou, A. , Isajenko, K., Jankovick M., Katzlberger, C., Kettunen, M., Kierepko, R., Kontro, R. Kwakman, P. J. M., Lecomte, M. , Leon Vintro, L. Leppänen, A.- P., Lind, B., Lujaniene, G., Mc Ginnity, P., Mc Mahon, C., Mala H., Manenti, S., Manolopoulou, M., Mattila, A., Mauring, A., Mietelski, J. W., Møller, B. S., Nielsen, P., Nikolick J., Overwater, R. M. W., Palsson, S. E., Papastefanou, C., Penev, I., Pham, M. K., Povinec, P. P., Ramebäck, H., Reis, M. C. , Ringer, W., Rodriguez, A., Rulík, P., Saey, P. R. J., Samsonov, V., Schlosser, C., Sgorbati, G. , Silobritiene, B. V., Söderström, C., Sogni, R., Solier, L., Sonck, M., Steinhauser, G., Steinkopff, T. , Steinmann, P., Stoulos, S., Sykora, I., Todorovic, D., Tooloutalaie, N., Tositti, L., Tschiersch, J., Ugron, A., Vagena, E., Vargas, A., Wershofen, A. H., and Zhukova, O.: Tracking of airborne radionuclides from the damaged Fukushima Dai-Ichi nuclear reactors by European networks, Environ. Sci. Technol., 45, 7670–7677, 2011.
Masumoto, Y., Miyazawa, Y., Tsumune, D., Kobayashi, T., Estournel, C., Marsaleix, P., Lanerolle, L., Mehra, A., and Garraffo, Z. D.: Oceanic dispersion simulation of Cesium-137 from Fukushima Dai-ichi nuclear power plant, Elements, 8, 207–212, 2012.
MEXT, Ministry of Education, Culture, Sports, Science and Technology: Monitoring information of environmental radioactivity levels, http://radioactivity.mext.go.jp/en/ (last access: 10 October 2012), 2011.
Miyazawa, Y., Masumoto, Y., Varlamov, S. M., and Miyama, T.: Transport simulation of the radionuclide from the shelf to open ocean around Fukushima, Cont. Shelf Res., 50–51, 16–29, 2012a.
Miyazawa, Y., Masumoto, Y., Varlamov, S. M., Miyama, T., Takigawa, M., Honda, M., and Saino, T.: Inverse estimation of source parameters of oceanic radioactivity dispersion models associated with the Fukushima accident, Biogeosciences, 10, 2349–2363, https://doi.org/10.5194/bg-10-2349-2013, 2013.
Mizutani, T., Koarashi, J., and Takeishi, M.: Monitoring of low-level radioactive liquid effluentin Tokai reprocessing plant, J. Nucl. Sci. Technol., 46, 665–672, 2009.
Morino, Y., Ohara, T., and Nishizawa, M.: Atmospheric behavior, deposition, and budget of radioactive materials from the Fukushima Daiichi nuclear power plant in March 2011, Geophys. Res. Lett., 38, L00G11, https://doi.org/10.1029/2011GL048689, 2011.
Nakano, M. and Povinec, P. P.: Oceanic general circulation model for the assessment of the distribution of 137Cs in the world ocean, Deep-sea Res. II, 50, 2803–2816, 2003a.
Nakano, M. and Povinec, P. P.: Modelling the distribution of plutonium in the Pacific Ocean, J. Environ. Radioact., 69, 85–106, 2003b.
Nakano, M. and Povinec, P. P.: Long-term simulations of the 137Cs dispersion from the Fukushima accident in the world ocean, J. Environ. Radioact., 111, 109–115, 2012.
NERH, Nuclear Emergency Response Headquarters, Government of Japan: Report of the Japanese Government to the IAEA Ministerial Conference on Nuclear Safety – The accident at TEPCO's Fukushima Nuclear Power Stations, http://www.iaea.org/newscenter/focus/fukushima/japan-report/ (last access: 10 October 2012), 2011.
NISA, Nuclear and Industrial Safety Agency: Regarding the Evaluation of the Conditions on Reactor Cores of Unit 1, 2 and 3 related to the Accident at Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Co. Inc., http://www.meti.go.jp/english/earthquake/nuclear/japan-challenges/pdf/japan-challenges_d.pdf (last access: 10 November 2012), 2011.
NSCJ, Nuclear Safety Commission of Japan: Trial estimation of emission of radioactive materials (131I, 137Cs) into the atmosphere from Fukushima Dai-ichi nuclear power station, Tokyo, http://www.nsr.go.jp/archive/nsc/NSCenglish/index.htm, 2011.
Palcsu, L., Major, Z., Köllő, Z., and Papp, L.: Using an ultrapure 4He spike in tritium measurements of environmental water samples by the 3He-ingrowth method, Rapid Comm. Mass Spectr., 24, 698–704, 2010.
Pham, M. K., Betti, M., Povinec, P. P., Alfimov, V., Biddulph, D., Gastaud, J., Kieser, W. E., Lopez Gutierez J. M., Possnert, G., Sanchez-Cabeza, J. A., and Suzuki, T.: Certified reference material IAEA-418: 129I in Mediterranean Sea water, J. Radioanal. Nucl. Chem., 286, 121–127, 2010.
Pham, M. K., Betti, M., Nies, H., and Povinec, P. P.: Temporal changes of 7Be, 137Cs and 210Pb activity concentrations in surface air at Monaco and their correlation with meteorological parameters, J. Environ. Radioact., 102, 1045–1054, 2011a.
Pham, M. K., Betti, M., Povinec, P. P., Benmansour, M., Bünger, V., Drefvelin, J., Engeler, C., Flemal, J. M., Gascó, C., Guillevic, J., Gurriaran, R., Groening, M., Happel, J. D., Herrmann, J., Klemola, S., Kloster, M., Kanisch, G., Leonard, K., Long, S., Nielsen, S., Oh, J.-S., Rieth, P. U., Östergren, I., Pettersson, H., Pinhao, N., Pujol, L., Sato, K., Schikowski, J., Varga, Z., Vartti, V. P., and Zheng, J.: A certified reference material for radionuclides in the water sample from Irish Sea (IAEA-443), J. Radioanal. Nucl. Chem., 288, 603–611, 2011b.
Pham, M. K., Povinec, P. P., Nies, H., and Betti, M.: Dry and wet deposition of 7Be, 210Pb and 137Cs in Monaco air during 1998–2010: seasonal variations of deposition fluxes, J. Environ. Radioact., 120, 45–57, 2013.
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. Instrum. Methods Phys. Res. B, 172, 672–678, 2000.
Povinec, P. P., Badie, C., Baeza, A., Barci-Funel, G., Bergan, T. D., Bojanowski, R., Burnett, W., Eikenberg, J., Fifield, L. K., Serradell, V., Gastaud, J., Goroncy, I., Herrmann, J., Hotchkis, M. A. C., Ikaheimonen, T. K., Jakobson, E., Kalimbadjan, J., La Rosa, J. J., Lee, S.-H., Liong Wee Kwong, L., Lueng, W. M., Nielsen, S. P., Noureddine, A., Pham, M. K., Rohou, J.-N., Sanchez-Cabeza, J. A., Suomela, J., Suplinska, M., and Wyse, E.: Certified reference material for radionuclides in seawater IAEA-381 (Irish Sea water), J. Radioanal. Nucl. Chem., 251, 369–374, 2002.
Povinec, P. P., Livingston, H. D., Shima, S., Aoyama, M., Gastaud, J., Goroncy, I., Hirose, K., Huyhn-Ngoc, L., Ikeuchi, Y., Ito, To., La Rosa, J., Liong Wee Kwong, L., 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. II, 50, 2607–2638, 2003a.
Povinec, P. P., Bailly Du Bois, P., Kershaw, P. J., Nies, H., and Scotto, P.: Temporal and spatial trends in the distribution of 137Cs in surface waters of Northern European Seas – A record of 40 years of investigations, Deep-Sea Res. Pt. II, 50, 2785–2801, 2003b.
Povinec, P. P., Hirose, K., Honda, T., Ito, T., Scott, E. M., and Togawa, O.: Spatial distribution of 3H, 90Sr, 137Cs and 239,240Pu in surface waters of the Pacific and Indian Oceans – GLOMARD database, J. Environ. Radioact., 76, 113–137, 2004.
Povinec, P. P., Aarkrog, A., Buesseler, K. O., Delfanti, R., Hirose, K., Hong, G. H., Ito, T., Livingston, H. D., Nies, H., Noshkin, V. E., Shima, S., and Togawa, O.: 90Sr, 137Cs and 239,240Pu concentration surface water time series in the Pacific and Indian Oceans – WOMARS results, J. Environ. Radioact., 81, 63–87, 2005a.
Povinec, P. P., Comanducci, J. F., and Levy-Palomo, I.: IAEA-MEL's underground counting laboratory (CAVE) for the analysis of radionuclides in the environment at very low-levels, J. Radioanal. Nucl. Chem., 263, 441–445, 2005b.
Povinec, P. P., Lee, S. H., Liong Wee Kwong, L.,Oregioni, 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. Instrum. Methods Phys. Res. B, 268, 1214–1218, 2010.
Povinec, P. P., Breier, R., Coppola, L., Groening, M., Jeandel, C., Jull, A. J. T., Kieser, W. E., and Top, Z.: Tracing of water masses using a multi-isotope approach in the southern Indian Ocean, Earth Planet. Sci. Lett., 302, 14–26, 2011.
Povinec, P. P., Hirose, K., and Aoyama, M.: Radiostronium in the western North Pacific: Characteristics, behavior, and the Fukushima impact, Environ. Sci. Technol., 46, 10356–10363, 2012a.
Povinec, P. P., Eriksson, M., Scholten, J., and Betti, M.: Marine Radioactivity Analysis, in: Handbook on Radioactivity Analysis, edited by: L'Annunziata, M. F., Academic Press, Amsterdam, 770–832, 2012b.
Povinec, P. P., Gera, M., Hirose, K., Lujaniené G., Nakano, M., and Plastino, W.: Dispersion of Fukushima radionuclides in the global atmosphere and the ocean, Appl. Rad. Isot., in press, https://doi.org/10.1016/j.apradiso.2013.03.058, 2013.
Raisbeck, G. M. and Yiou, F.: 129I in the oceans: origins and applications, Sci. Total Environ., 237/238, 31–41, 1999.
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 Discuss., 10, 1517–1550, https://doi.org/10.5194/bgd-10-1517-2013, 2013.
Schlosser, P., Bayer, R., Boenisch, G., Cooper, L. W., Ekwurzel, B., Jenkins, W. J., Khatiwala, S., Pfirman, S., and Smethie, W. M.: Pathways and residence times of dissolved pollutants in the ocean derived from transient tracers and stable isotopes, Sci. Total Environ., 237/238, 15–30, 1999.
Shima, S., Gasa, S., Iseda, K., Nakayama, T., and Kawamura, H.: Distribution of anthropogenic radionuclides in the water column off Rokkasho, Japan, in: Radionuclides in the Environment, edited by: Povinec, P. P., Sanchez-Cabeza J. A., Elsevier, Amsterdam, 2006, 83–95.
Stohl, A., Seibert, P., Wotawa, G., Arnold, D., Burkhart, J. F., Eckhardt, S., Tapia, C., Vargas, A., and Yasunari, T. J.: Xenon-133 and caesium-137 releases into the atmosphere from the Fukushima Dai-ichi nuclear power plant: determination of the source term, atmospheric dispersion, and deposition, Atmos. Chem. Phys., 12, 2313–2343, https://doi.org/10.5194/acp-12-2313-2012, 2012.
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. Methods Phys. Res. B, 268, 1229–1231, 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 Discuss., 10, 1401–1419, https://doi.org/10.5194/bgd-10-1401-2013, 2013.
Takemura, T., Nakamura, H., Takigawa, M., Kondo H., Satonuma, T., Miyasaka, T., and Nakajima, T.: A numerical simulation of global transport of atmospheric particles emitted from the Fukushima Daiichi nuclear power plant, Scientific Online Letters on the Atmosphere, 7, 101–104, 2011.
TEPCO, Tokyo Electric Power Company: Result of radioactive nuclide analysis around Fukushima Daiichi Nuclear Power Station, http://www.tepco.co.jp/en/press/corp-com/release/11042103-e.html (last access: 20 December 2012), 2011.
TEPCO, Tokyo Electric Power Company: Fukushima Nuclear Accidents Investigation Report, http://www.tepco.co.jp/en/nu/fukushima-np/interim/index-e.html (last access: 20 December 2012), 2012.
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. Environ. Radioact., 113, 116–122, 2012.
Tsumune, D., Tsubono, T., Aoyama, M., and Hirose, K.: Distribution of oceanic 137Cs from the Fukushima Dai-ichi Nuclear Power Plant simulated numerically by a regional ocean model, J. Environ. Radioactiv., 111, 100–108, 2012.
Tsumune, D., Tsubono, T., Aoyama, M., Uematsu, M., Misumi, K., Maeda, Y., Yoshida, Y., and Hayami, H.: One-year, regional-scale simulation of 137Cs radioactivity in the ocean following the Fukushima Daiichi Nuclear Power Plant accident, Biogeosciences Discuss., 10, 6259–6314, https://doi.org/10.5194/bgd-10-6259-2013, 2013.
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, J. Radioanal. Nucl. Chem., 296, 957–962, 2013.
UNSCEAR, United Nations Scientific Committee on the Effects of Atomic Radiation: Sources and Effects of Ionizing Radiation. Report to the General Assembly, United Nations, New York, USA, 2008.
Yoshida, N. and Kanda, J.: Tracking the Fukushima Radionuclides, Science, 336, 1115–1116, 2012.