Articles | Volume 19, issue 7
https://doi.org/10.5194/bg-19-2043-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-2043-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Apr 2022
Research article |
| 14 Apr 2022
| 14 Apr 2022
New constraints on biological production and mixing processes in the South China Sea from triple isotope composition of dissolved oxygen
Hana Jurikova
CORRESPONDING AUTHOR
School of Earth and Environmental Sciences, University of St Andrews,
KY16 9TS St Andrews, United Kingdom
Osamu Abe
Graduate School of Environmental Studies, Nagoya University, 464-8601
Nagoya, Japan
Fuh-Kwo Shiah
Research Center for Environmental Changes, Academia Sinica, 11529
Taipei, Taiwan
Institute of Earth Sciences, Academia Sinica, 11529 Taipei, Taiwan
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Facheng Ye, Hana Jurikova, Lucia Angiolini, Uwe Brand, Gaia Crippa, Daniela Henkel, Jürgen Laudien, Claas Hiebenthal, and Danijela Šmajgl
Biogeosciences, 16, 617–642, https://doi.org/10.5194/bg-16-617-2019, https://doi.org/10.5194/bg-16-617-2019, 2019
Hana Jurikova, Tania Guha, Osamu Abe, Fuh-Kwo Shiah, Chung-Ho Wang, and Mao-Chang Liang
Biogeosciences, 13, 6683–6698, https://doi.org/10.5194/bg-13-6683-2016, https://doi.org/10.5194/bg-13-6683-2016, 2016
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Life on Earth is directly or indirectly linked to primary production (PP), the quantification of which poses a challenge. In our study we use the oxygen isotopes and oxygen–argon ratios technique to estimate PP in situ. To date this method has been used to assess PP in the ocean and we expand on its application to freshwater systems. Providing that the physical structure of the water column is constrained, this method presents a powerful tracer for atmospheric vs. photosynthetic oxygen input.
Facheng Ye, Hana Jurikova, Lucia Angiolini, Uwe Brand, Gaia Crippa, Daniela Henkel, Jürgen Laudien, Claas Hiebenthal, and Danijela Šmajgl
Biogeosciences, 16, 617–642, https://doi.org/10.5194/bg-16-617-2019, https://doi.org/10.5194/bg-16-617-2019, 2019
Chung-Chi Chen, Gwo-Ching Gong, Wen-Chen Chou, Chih-Ching Chung, Chih-Hao Hsieh, Fuh-Kwo Shiah, and Kuo-Ping Chiang
Biogeosciences, 14, 2597–2609, https://doi.org/10.5194/bg-14-2597-2017, https://doi.org/10.5194/bg-14-2597-2017, 2017
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To understand the flooding effects on a pelagic ecosystem in the East China Sea (ECS), a variety of variables were measured in 2009 (non-flood) and 2010 (flood). In 2010, the organic carbon consumption was higher than in 2009; this could be attributed to the vigorous plankton activities observed in low-salinity areas. A huge amount of f CO2 was also drawn down in the flood. This flood effect might become more pronounced as extreme rainfall events increase dramatically throughout the world.
Hana Jurikova, Tania Guha, Osamu Abe, Fuh-Kwo Shiah, Chung-Ho Wang, and Mao-Chang Liang
Biogeosciences, 13, 6683–6698, https://doi.org/10.5194/bg-13-6683-2016, https://doi.org/10.5194/bg-13-6683-2016, 2016
Short summary
Short summary
Life on Earth is directly or indirectly linked to primary production (PP), the quantification of which poses a challenge. In our study we use the oxygen isotopes and oxygen–argon ratios technique to estimate PP in situ. To date this method has been used to assess PP in the ocean and we expand on its application to freshwater systems. Providing that the physical structure of the water column is constrained, this method presents a powerful tracer for atmospheric vs. photosynthetic oxygen input.
Amzad Hussain Laskar and Mao-Chang Liang
Biogeosciences, 13, 5297–5314, https://doi.org/10.5194/bg-13-5297-2016, https://doi.org/10.5194/bg-13-5297-2016, 2016
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We present clumped isotope data in air CO2 over land and ocean in Taiwan and its vicinity. CO2 over ocean is in thermodynamic equilibrium with the surface sea water and deviated significantly in urban and suburban areas due contribution from combustion emission. Photosynthetic activity deviates residual CO2 from thermodynamic equilibrium but respiration does not. Deviations from thermodynamic equilibrium by various interactions in different environments are presented.
Jr-Chuan Huang, Tsung-Yu Lee, Teng-Chiu Lin, Thomas Hein, Li-Chin Lee, Yu-Ting Shih, Shuh-Ji Kao, Fuh-Kwo Shiah, and Neng-Huei Lin
Biogeosciences, 13, 1787–1800, https://doi.org/10.5194/bg-13-1787-2016, https://doi.org/10.5194/bg-13-1787-2016, 2016
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The mean riverine DIN export of 49 watersheds in Taiwan is ∼ 3800 kg N km−2 yr−1, 18 times the global average. The mean riverine DIN export ratio is 0.30–0.51, which is much higher than the average of 0.20–0.25 of large rivers around the world, indicating excessive N input relative to ecosystem retention capacity. The DIN export ratio is positively related to agriculture input, and levels of human disturbance and watersheds with high DIN export ratios are likely at advanced stages of N excess.
C.-C. Chen, G.-C. Gong, W.-C. Chou, C.-C. Chung, F.-K. Shiah, and K.-P. Chiang
Biogeosciences Discuss., https://doi.org/10.5194/bgd-12-5609-2015, https://doi.org/10.5194/bgd-12-5609-2015, 2015
Revised manuscript not accepted
T.-Y. Lee, Y.-T. Shih, J.-C. Huang, S.-J. Kao, F.-K. Shiah, and K.-K. Liu
Biogeosciences, 11, 5307–5321, https://doi.org/10.5194/bg-11-5307-2014, https://doi.org/10.5194/bg-11-5307-2014, 2014
S.-C. Hsu, G.-C. Gong, F.-K. Shiah, C.-C. Hung, S.-J. Kao, R. Zhang, W.-N. Chen, C.-C. Chen, C. C.-K. Chou, Y.-C. Lin, F.-J. Lin, and S.-H. Lin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acpd-14-21433-2014, https://doi.org/10.5194/acpd-14-21433-2014, 2014
Revised manuscript has not been submitted
C.-C. Lai, Y.-W. Fu, H.-B. Liu, H.-Y. Kuo, K.-W. Wang, C.-H. Lin, J.-H. Tai, G. T. F. Wong, K.-Y. Lee, T.-Y. Chen, Y. Yamamoto, M.-F. Chow, Y. Kobayashi, C.-Y. Ko, and F.-K. Shiah
Biogeosciences, 11, 147–156, https://doi.org/10.5194/bg-11-147-2014, https://doi.org/10.5194/bg-11-147-2014, 2014
C.-C. Chen, G.-C. Gong, F.-K. Shiah, W.-C. Chou, and C.-C. Hung
Biogeosciences, 10, 2931–2943, https://doi.org/10.5194/bg-10-2931-2013, https://doi.org/10.5194/bg-10-2931-2013, 2013
Related subject area
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High-frequency continuous measurements reveal strong diel and seasonal cycling of pCO2 and CO2 flux in a mesohaline reach of the Chesapeake Bay
Significant role of physical transport in the marine carbon monoxide (CO) cycle: observations in the East Sea (Sea of Japan), the western North Pacific, and the Bering Sea in summer
Central Arctic Ocean surface–atmosphere exchange of CO2 and CH4 constrained by direct measurements
Spatial and seasonal variability in volatile organic sulfur compounds in seawater and the overlying atmosphere of the Bohai and Yellow seas
Estimating marine carbon uptake in the northeast Pacific using a neural network approach
Sea–air methane flux estimates derived from marine surface observations and instantaneous atmospheric measurements in the northern Labrador Sea and Baffin Bay
Global analysis of the controls on seawater dimethylsulfide spatial variability
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Concentrations of dissolved dimethyl sulfide (DMS), methanethiol and other trace gases in context of microbial communities from the temperate Atlantic to the Arctic Ocean
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The sensitivity of pCO2 reconstructions to sampling scales across a Southern Ocean sub-domain: a semi-idealized ocean sampling simulation approach
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Interannual drivers of the seasonal cycle of CO2 in the Southern Ocean
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Dimethyl sulfide (DMS) is the largest natural source of sulfur in the atmosphere and leads to the formation of cloud condensation nuclei. DMS emission and quantification of its impacts have large uncertainties, but a detailed study on the emissions and drivers of their uncertainty is missing to date. The emissions are usually calculated from the seawater DMS concentrations and a flux parameterization. Here we quantify the differences in DMS seawater products, which can affect DMS fluxes.
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Dimethyl sulfide (DMS) is the largest natural source of sulfur in the atmosphere and leads to the formation of cloud condensation nuclei. DMS emissions and quantification of their impacts have large uncertainties, but a detailed study on the range of emissions and drivers of their uncertainty is missing to date. The emissions are calculated from the seawater DMS concentrations and a flux parameterization. Here we quantify the differences in the effect of flux parameterizations used in models.
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High frequency pCO2 measurements reveal net neutral CO2 flux in a mesohaline reach of the Chesapeake Bay. Net off-gassing to the atmosphere begins in June when water temperatures rise above ~26ºC, continuing through November when temperatures fall below ~10ºC. Dissolved CO2 concentrations follow day–night cycles and are especially pronounced in warm waters. From December through May, the river is largely an uninterrupted sink for CO2 (i.e. CO2 is drawn out of the atmosphere into the river).
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Biogeosciences, 21, 161–176, https://doi.org/10.5194/bg-21-161-2024, https://doi.org/10.5194/bg-21-161-2024, 2024
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The distributions of volatile organic sulfur compounds (VSCs) (DMS, COS, and CS2) in the seawater and atmosphere of the Bohai and Yellow Seas were evaluated. Seasonal variations in VSCs were found and showed summer > spring. The COS concentrations exhibited positive correlation with DOC concentrations in seawater during summer. VSCs concentrations in seawater decreased with the depth. Sea-to-air fluxes of COS, DMS, and CS2 indicated that these marginal seas are sources of atmospheric VSCs.
Patrick J. Duke, Roberta C. Hamme, Debby Ianson, Peter Landschützer, Mohamed M. M. Ahmed, Neil C. Swart, and Paul A. Covert
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Judith Vogt, David Risk, Evelise Bourlon, Kumiko Azetsu-Scott, Evan N. Edinger, and Owen A. Sherwood
Biogeosciences, 20, 1773–1787, https://doi.org/10.5194/bg-20-1773-2023, https://doi.org/10.5194/bg-20-1773-2023, 2023
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The release of the greenhouse gas methane from Arctic submarine sources could exacerbate climate change in a positive feedback. Continuous monitoring of atmospheric methane levels over a 5100 km voyage in the western margin of the Labrador Sea and Baffin Bay revealed above-global averages likely affected by both onshore and offshore methane sources. Instantaneous sea–air methane fluxes were near zero at all measured stations, including a persistent cold-seep location.
George Manville, Thomas G. Bell, Jane P. Mulcahy, Rafel Simó, Martí Galí, Anoop S. Mahajan, Shrivardhan Hulswar, and Paul R. Halloran
Biogeosciences, 20, 1813–1828, https://doi.org/10.5194/bg-20-1813-2023, https://doi.org/10.5194/bg-20-1813-2023, 2023
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We present the first global investigation of controls on seawater dimethylsulfide (DMS) spatial variability over scales of up to 100 km. Sea surface height anomalies, density, and chlorophyll a help explain almost 80 % of DMS variability. The results suggest that physical and biogeochemical processes play an equally important role in controlling DMS variability. These data provide independent confirmation that existing parameterisations of seawater DMS concentration use appropriate variables.
Ryo Dobashi and David T. Ho
Biogeosciences, 20, 1075–1087, https://doi.org/10.5194/bg-20-1075-2023, https://doi.org/10.5194/bg-20-1075-2023, 2023
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Seagrass meadows are productive ecosystems and bury much carbon. Understanding their role in the global carbon cycle requires knowledge of air–sea CO2 fluxes and hence the knowledge of gas transfer velocity (k). In this study, k was determined from the dual tracer technique in Florida Bay. The observed gas transfer velocity was lower than previous studies in the coastal and open oceans at the same wind speeds, most likely due to wave attenuation by seagrass and limited wind fetch in this area.
Valérie Gros, Bernard Bonsang, Roland Sarda-Estève, Anna Nikolopoulos, Katja Metfies, Matthias Wietz, and Ilka Peeken
Biogeosciences, 20, 851–867, https://doi.org/10.5194/bg-20-851-2023, https://doi.org/10.5194/bg-20-851-2023, 2023
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The oceans are both sources and sinks for trace gases important for atmospheric chemistry and marine ecology. Here, we quantified selected trace gases (including the biological metabolites dissolved dimethyl sulfide, methanethiol and isoprene) along a 2500 km transect from the North Atlantic to the Arctic Ocean. In the context of phytoplankton and bacterial communities, our study suggests that methanethiol (rarely measured before) might substantially influence ocean–atmosphere cycling.
Tsukasa Dobashi, Yuzo Miyazaki, Eri Tachibana, Kazutaka Takahashi, Sachiko Horii, Fuminori Hashihama, Saori Yasui-Tamura, Yoko Iwamoto, Shu-Kuan Wong, and Koji Hamasaki
Biogeosciences, 20, 439–449, https://doi.org/10.5194/bg-20-439-2023, https://doi.org/10.5194/bg-20-439-2023, 2023
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Water-soluble organic nitrogen (WSON) in marine aerosols is important for biogeochemical cycling of bioelements. Our shipboard measurements suggested that reactive nitrogen produced and exuded by nitrogen-fixing microorganisms in surface seawater likely contributed to the formation of WSON aerosols in the subtropical North Pacific. This study provides new implications for the role of marine microbial activity in the formation of WSON aerosols in the ocean surface.
Lukas Eickhoff, Maddalena Bayer-Giraldi, Naama Reicher, Yinon Rudich, and Thomas Koop
Biogeosciences, 20, 1–14, https://doi.org/10.5194/bg-20-1-2023, https://doi.org/10.5194/bg-20-1-2023, 2023
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The formation of ice is an important process in Earth’s atmosphere, biosphere, and cryosphere, in particular in polar regions. Our research focuses on the influence of the sea ice diatom Fragilariopsis cylindrus and of molecules produced by it upon heterogenous ice nucleation. For that purpose, we studied the freezing of tiny droplets containing the diatoms in a microfluidic device. Together with previous studies, our results suggest a common freezing behaviour of various sea ice diatoms.
Lucía Gutiérrez-Loza, Erik Nilsson, Marcus B. Wallin, Erik Sahlée, and Anna Rutgersson
Biogeosciences, 19, 5645–5665, https://doi.org/10.5194/bg-19-5645-2022, https://doi.org/10.5194/bg-19-5645-2022, 2022
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The exchange of CO2 between the ocean and the atmosphere is an essential aspect of the global carbon cycle and is highly relevant for the Earth's climate. In this study, we used 9 years of in situ measurements to evaluate the temporal variability in the air–sea CO2 fluxes in the Baltic Sea. Furthermore, using this long record, we assessed the effect of atmospheric and water-side mechanisms controlling the efficiency of the air–sea CO2 exchange under different wind-speed conditions.
Li Zhou, Dennis Booge, Miming Zhang, and Christa A. Marandino
Biogeosciences, 19, 5021–5040, https://doi.org/10.5194/bg-19-5021-2022, https://doi.org/10.5194/bg-19-5021-2022, 2022
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Trace gas air–sea exchange exerts an important control on air quality and climate, especially in the Southern Ocean (SO). Almost all of the measurements there are skewed to summer, but it is essential to expand our measurement database over greater temporal and spatial scales. Therefore, we report measured concentrations of dimethylsulfide (DMS, as well as related sulfur compounds) and isoprene in the Atlantic sector of the SO. The observations of isoprene are the first in the winter in the SO.
Theresa Barthelmeß and Anja Engel
Biogeosciences, 19, 4965–4992, https://doi.org/10.5194/bg-19-4965-2022, https://doi.org/10.5194/bg-19-4965-2022, 2022
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Greenhouse gases released by human activity cause a global rise in mean temperatures. While scientists can predict how much of these gases accumulate in the atmosphere based on not only human-derived sources but also oceanic sinks, it is rather difficult to predict the major influence of coastal ecosystems. We provide a detailed study on the occurrence, composition, and controls of substances that suppress gas exchange. We thus help to determine what controls coastal greenhouse gas fluxes.
Daniel J. Ford, Gavin H. Tilstone, Jamie D. Shutler, and Vassilis Kitidis
Biogeosciences, 19, 4287–4304, https://doi.org/10.5194/bg-19-4287-2022, https://doi.org/10.5194/bg-19-4287-2022, 2022
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This study explores the seasonal, inter-annual, and multi-year drivers of the South Atlantic air–sea CO2 flux. Our analysis showed seasonal sea surface temperatures dominate in the subtropics, and the subpolar regions correlated with biological processes. Inter-annually, the El Niño–Southern Oscillation correlated with the CO2 flux by modifying sea surface temperatures and biological activity. Long-term trends indicated an important biological contribution to changes in the air–sea CO2 flux.
Laique M. Djeutchouang, Nicolette Chang, Luke Gregor, Marcello Vichi, and Pedro M. S. Monteiro
Biogeosciences, 19, 4171–4195, https://doi.org/10.5194/bg-19-4171-2022, https://doi.org/10.5194/bg-19-4171-2022, 2022
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Based on observing system simulation experiments using a mesoscale-resolving model, we found that to significantly improve uncertainties and biases in carbon dioxide (CO2) mapping in the Southern Ocean, it is essential to resolve the seasonal cycle (SC) of the meridional gradient of CO2 through high frequency (at least daily) observations that also span the region's meridional axis. We also showed that the estimated SC anomaly and mean annual CO2 are highly sensitive to seasonal sampling biases.
Liliane Merlivat, Michael Hemming, Jacqueline Boutin, David Antoine, Vincenzo Vellucci, Melek Golbol, Gareth A. Lee, and Laurence Beaumont
Biogeosciences, 19, 3911–3920, https://doi.org/10.5194/bg-19-3911-2022, https://doi.org/10.5194/bg-19-3911-2022, 2022
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We use in situ high-temporal-resolution measurements of dissolved inorganic carbon and atmospheric parameters at the air–sea interface to analyse phytoplankton bloom initiation identified as the net rate of biological carbon uptake in the Mediterranean Sea. The shift from wind-driven to buoyancy-driven mixing creates conditions for blooms to begin. Active mixing at the air–sea interface leads to the onset of the surface phytoplankton bloom due to the relaxation of wind speed following storms.
Léa Olivier, Jacqueline Boutin, Gilles Reverdin, Nathalie Lefèvre, Peter Landschützer, Sabrina Speich, Johannes Karstensen, Matthieu Labaste, Christophe Noisel, Markus Ritschel, Tobias Steinhoff, and Rik Wanninkhof
Biogeosciences, 19, 2969–2988, https://doi.org/10.5194/bg-19-2969-2022, https://doi.org/10.5194/bg-19-2969-2022, 2022
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We investigate the impact of the interactions between eddies and the Amazon River plume on the CO2 air–sea fluxes to better characterize the ocean carbon sink in winter 2020. The region is a strong CO2 sink, previously underestimated by a factor of 10 due to a lack of data and understanding of the processes responsible for the variability in ocean carbon parameters. The CO2 absorption is mainly driven by freshwater from the Amazon entrained by eddies and by the winter seasonal cooling.
Richard P. Sims, Michael Bedington, Ute Schuster, Andrew J. Watson, Vassilis Kitidis, Ricardo Torres, Helen S. Findlay, James R. Fishwick, Ian Brown, and Thomas G. Bell
Biogeosciences, 19, 1657–1674, https://doi.org/10.5194/bg-19-1657-2022, https://doi.org/10.5194/bg-19-1657-2022, 2022
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The amount of carbon dioxide (CO2) being absorbed by the ocean is relevant to the earth's climate. CO2 values in the coastal ocean and estuaries are not well known because of the instrumentation used. We used a new approach to measure CO2 across the coastal and estuarine zone. We found that CO2 and salinity were linked to the state of the tide. We used our CO2 measurements and model salinity to predict CO2. Previous studies overestimate how much CO2 the coastal ocean draws down at our site.
Thi Tuyet Trang Chau, Marion Gehlen, and Frédéric Chevallier
Biogeosciences, 19, 1087–1109, https://doi.org/10.5194/bg-19-1087-2022, https://doi.org/10.5194/bg-19-1087-2022, 2022
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Air–sea CO2 fluxes and associated uncertainty over the open ocean to coastal shelves are estimated with a new ensemble-based reconstruction of pCO2 trained on observation-based data. The regional distribution and seasonality of CO2 sources and sinks are consistent with those suggested in previous studies as well as mechanisms discussed therein. The ensemble-based uncertainty field allows identifying critical regions where improvements in pCO2 and air–sea CO2 flux estimates should be a priority.
Charel Wohl, Anna E. Jones, William T. Sturges, Philip D. Nightingale, Brent Else, Brian J. Butterworth, and Mingxi Yang
Biogeosciences, 19, 1021–1045, https://doi.org/10.5194/bg-19-1021-2022, https://doi.org/10.5194/bg-19-1021-2022, 2022
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We measured concentrations of five different organic gases in seawater in the high Arctic during summer. We found higher concentrations near the surface of the water column (top 5–10 m) and in areas of partial ice cover. This suggests that sea ice influences the concentrations of these gases. These gases indirectly exert a slight cooling effect on the climate, and it is therefore important to measure the levels accurately for future climate predictions.
Alain de Verneil, Zouhair Lachkar, Shafer Smith, and Marina Lévy
Biogeosciences, 19, 907–929, https://doi.org/10.5194/bg-19-907-2022, https://doi.org/10.5194/bg-19-907-2022, 2022
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The Arabian Sea is a natural CO2 source to the atmosphere, but previous work highlights discrepancies between data and models in estimating air–sea CO2 flux. In this study, we use a regional ocean model, achieve a flux closer to available data, and break down the seasonal cycles that impact it, with one result being the great importance of monsoon winds. As demonstrated in a meta-analysis, differences from data still remain, highlighting the great need for further regional data collection.
Jesse M. Vance, Kim Currie, John Zeldis, Peter W. Dillingham, and Cliff S. Law
Biogeosciences, 19, 241–269, https://doi.org/10.5194/bg-19-241-2022, https://doi.org/10.5194/bg-19-241-2022, 2022
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Long-term monitoring is needed to detect changes in our environment. Time series of ocean carbon have aided our understanding of seasonal cycles and provided evidence for ocean acidification. Data gaps are inevitable, yet no standard method for filling gaps exists. We present a regression approach here and compare it to seven other common methods to understand the impact of different approaches when assessing seasonal to climatic variability in ocean carbon.
Daniel J. Ford, Gavin H. Tilstone, Jamie D. Shutler, and Vassilis Kitidis
Biogeosciences, 19, 93–115, https://doi.org/10.5194/bg-19-93-2022, https://doi.org/10.5194/bg-19-93-2022, 2022
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This study identifies the most accurate biological proxy for the estimation of seawater pCO2 fields, which are key to assessing the ocean carbon sink. Our analysis shows that the net community production (NCP), the balance between photosynthesis and respiration, was more accurate than chlorophyll a within a neural network scheme. The improved pCO2 estimates, based on NCP, identified the South Atlantic Ocean as a net CO2 source, compared to a CO2 sink using chlorophyll a.
Birthe Zäncker, Michael Cunliffe, and Anja Engel
Biogeosciences, 18, 2107–2118, https://doi.org/10.5194/bg-18-2107-2021, https://doi.org/10.5194/bg-18-2107-2021, 2021
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Fungi are found in numerous marine environments. Our study found an increased importance of fungi in the Ionian Sea, where bacterial and phytoplankton counts were reduced, but organic matter was still available, suggesting fungi might benefit from the reduced competition from bacteria in low-nutrient, low-chlorophyll (LNLC) regions.
Jon Olafsson, Solveig R. Olafsdottir, Taro Takahashi, Magnus Danielsen, and Thorarinn S. Arnarson
Biogeosciences, 18, 1689–1701, https://doi.org/10.5194/bg-18-1689-2021, https://doi.org/10.5194/bg-18-1689-2021, 2021
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The Atlantic north of 50° N is an intense ocean sink area for atmospheric CO2. Observations in the vicinity of Iceland reveal a previously unrecognized Arctic contribution to the North Atlantic CO2 sink. Sustained CO2 influx to waters flowing from the Arctic Ocean is linked to their excess alkalinity derived from sources in the changing Arctic. The results relate to the following question: will the North Atlantic continue to absorb CO2 in the future as it has in the past?
Wei-Lei Wang, Guisheng Song, François Primeau, Eric S. Saltzman, Thomas G. Bell, and J. Keith Moore
Biogeosciences, 17, 5335–5354, https://doi.org/10.5194/bg-17-5335-2020, https://doi.org/10.5194/bg-17-5335-2020, 2020
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Dimethyl sulfide, a volatile compound produced as a byproduct of marine phytoplankton activity, can be emitted to the atmosphere via gas exchange. In the atmosphere, DMS is oxidized to cloud condensation nuclei, thus contributing to cloud formation. Therefore, oceanic DMS plays an important role in regulating the planet's climate by influencing the radiation budget. In this study, we use an artificial neural network model to update the global DMS climatology and estimate the sea-to-air flux.
Yuri Galletti, Silvia Becagli, Alcide di Sarra, Margherita Gonnelli, Elvira Pulido-Villena, Damiano M. Sferlazzo, Rita Traversi, Stefano Vestri, and Chiara Santinelli
Biogeosciences, 17, 3669–3684, https://doi.org/10.5194/bg-17-3669-2020, https://doi.org/10.5194/bg-17-3669-2020, 2020
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This paper reports the first data about atmospheric deposition of dissolved organic matter (DOM) on the island of Lampedusa. It also shows the implications for the surface marine layer by studying the impact of atmospheric organic carbon deposition in the marine ecosystem. It is a preliminary study, but it is pioneering and important for having new data that can be crucial in order to understand the impact of atmospheric deposition on the marine carbon cycle in a global climate change scenario.
Charel Wohl, Ian Brown, Vassilis Kitidis, Anna E. Jones, William T. Sturges, Philip D. Nightingale, and Mingxi Yang
Biogeosciences, 17, 2593–2619, https://doi.org/10.5194/bg-17-2593-2020, https://doi.org/10.5194/bg-17-2593-2020, 2020
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The oceans represent a poorly understood source of organic carbon to the atmosphere. In this paper, we present ship-based measurements of specific compounds in ambient air and seawater of the Southern Ocean. We present fluxes of these gases between air and sea at very high resolution. The data also contain evidence for day and night variations in some of these compounds. These measurements can be used to better understand the role of the Southern Ocean in the cycling of these compounds.
Rebecca L. Jackson, Albert J. Gabric, Roger Cropp, and Matthew T. Woodhouse
Biogeosciences, 17, 2181–2204, https://doi.org/10.5194/bg-17-2181-2020, https://doi.org/10.5194/bg-17-2181-2020, 2020
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Coral reefs are a strong source of atmospheric sulfur through stress-induced emissions of dimethylsulfide (DMS). This biogenic sulfur can influence aerosol and cloud properties and, consequently, the radiative balance over the ocean. DMS emissions may therefore help to mitigate coral physiological stress via increased low-level cloud cover and reduced sea surface temperature. The importance of DMS in coral physiology and climate is reviewed and the implications for coral bleaching are discussed.
Louise Delaigue, Helmuth Thomas, and Alfonso Mucci
Biogeosciences, 17, 547–566, https://doi.org/10.5194/bg-17-547-2020, https://doi.org/10.5194/bg-17-547-2020, 2020
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This paper reports on the first compilation and analysis of the surface water pCO2 distribution in the Saguenay Fjord, the southernmost subarctic fjord in the Northern Hemisphere, and thus fills a significant knowledge gap in current regional estimates of estuarine CO2 emissions.
Tim Fischer, Annette Kock, Damian L. Arévalo-Martínez, Marcus Dengler, Peter Brandt, and Hermann W. Bange
Biogeosciences, 16, 2307–2328, https://doi.org/10.5194/bg-16-2307-2019, https://doi.org/10.5194/bg-16-2307-2019, 2019
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We investigated air–sea gas exchange in oceanic upwelling regions for the case of nitrous oxide off Peru. In this region, routine concentration measurements from ships at 5 m or 10 m depth prove to overestimate surface (bulk) concentration. Thus, standard estimates of gas exchange will show systematic error. This is due to very shallow stratified layers that inhibit exchange between surface water and waters below and can exist for several days. Maximum bias occurs in moderate wind conditions.
Mingxi Yang, Thomas G. Bell, Ian J. Brown, James R. Fishwick, Vassilis Kitidis, Philip D. Nightingale, Andrew P. Rees, and Timothy J. Smyth
Biogeosciences, 16, 961–978, https://doi.org/10.5194/bg-16-961-2019, https://doi.org/10.5194/bg-16-961-2019, 2019
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We quantify the emissions and uptake of the greenhouse gases carbon dioxide and methane from the coastal seas of the UK over 1 year using the state-of-the-art eddy covariance technique. Our measurements show how these air–sea fluxes vary twice a day (tidal), diurnally (circadian) and seasonally. We also estimate the air–sea gas transfer velocity, which is essential for modelling and predicting coastal air-sea exchange.
Riley X. Brady, Nicole S. Lovenduski, Michael A. Alexander, Michael Jacox, and Nicolas Gruber
Biogeosciences, 16, 329–346, https://doi.org/10.5194/bg-16-329-2019, https://doi.org/10.5194/bg-16-329-2019, 2019
Stelios Myriokefalitakis, Akinori Ito, Maria Kanakidou, Athanasios Nenes, Maarten C. Krol, Natalie M. Mahowald, Rachel A. Scanza, Douglas S. Hamilton, Matthew S. Johnson, Nicholas Meskhidze, Jasper F. Kok, Cecile Guieu, Alex R. Baker, Timothy D. Jickells, Manmohan M. Sarin, Srinivas Bikkina, Rachel Shelley, Andrew Bowie, Morgane M. G. Perron, and Robert A. Duce
Biogeosciences, 15, 6659–6684, https://doi.org/10.5194/bg-15-6659-2018, https://doi.org/10.5194/bg-15-6659-2018, 2018
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The first atmospheric iron (Fe) deposition model intercomparison is presented in this study, as a result of the deliberations of the United Nations Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP; http://www.gesamp.org/) Working Group 38. We conclude that model diversity over remote oceans reflects uncertainty in the Fe content parameterizations of dust aerosols, combustion aerosol emissions and the size distribution of transported aerosol Fe.
Liliane Merlivat, Jacqueline Boutin, David Antoine, Laurence Beaumont, Melek Golbol, and Vincenzo Vellucci
Biogeosciences, 15, 5653–5662, https://doi.org/10.5194/bg-15-5653-2018, https://doi.org/10.5194/bg-15-5653-2018, 2018
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The fugacity of carbon dioxide in seawater (fCO2) was measured hourly in the surface waters of the NW Mediterranean Sea during two 3-year sequences separated by 18 years. A decrease of pH of 0.0022 yr−1 was computed. About 85 % of the accumulation of dissolved inorganic carbon (DIC) comes from chemical equilibration with increasing atmospheric CO2; the remaining 15 % accumulation is consistent with estimates of transfer of Atlantic waters through the Gibraltar Strait.
Amanda R. Fay, Nicole S. Lovenduski, Galen A. McKinley, David R. Munro, Colm Sweeney, Alison R. Gray, Peter Landschützer, Britton B. Stephens, Taro Takahashi, and Nancy Williams
Biogeosciences, 15, 3841–3855, https://doi.org/10.5194/bg-15-3841-2018, https://doi.org/10.5194/bg-15-3841-2018, 2018
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The Southern Ocean is highly under-sampled and since this region dominates the ocean sink for CO2, understanding change is critical. Here we utilize available observations to evaluate how the seasonal cycle, variability, and trends in surface ocean carbon in the well-sampled Drake Passage region compare to that of the broader subpolar Southern Ocean. Results indicate that the Drake Passage is representative of the broader region; however, additional winter observations would improve comparisons.
Cui-Ci Sun, Martin Sperling, and Anja Engel
Biogeosciences, 15, 3577–3589, https://doi.org/10.5194/bg-15-3577-2018, https://doi.org/10.5194/bg-15-3577-2018, 2018
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Biogenic gel particles such as transparent exopolymer particles (TEP) and Coomassie stainable particles (CSP) are important components in the sea-surface microlayer (SML). Their potential role in air–sea gas exchange and in primary organic aerosol emission has generated considerable research interest. Our wind wave channel experiment revealed how wind speed controls the accumulation and size distribution of biogenic gel particles in the SML.
N. Precious Mongwe, Marcello Vichi, and Pedro M. S. Monteiro
Biogeosciences, 15, 2851–2872, https://doi.org/10.5194/bg-15-2851-2018, https://doi.org/10.5194/bg-15-2851-2018, 2018
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Here we analyze seasonal cycle of CO2 biases in 10 CMIP5 models in the SO. We find two main model biases; exaggeration of primary production such that biologically driven DIC changes mainly regulates FCO2 variability, and an overestimation of the role of solubility, such that changes in temperature dominantly drive FCO2 seasonal changes to an extent of opposing biological CO2 uptake in spring. CMIP5 models show greater zonal homogeneity in the seasonal cycle of FCO2 than observational products.
Allison R. Moreno, George I. Hagstrom, Francois W. Primeau, Simon A. Levin, and Adam C. Martiny
Biogeosciences, 15, 2761–2779, https://doi.org/10.5194/bg-15-2761-2018, https://doi.org/10.5194/bg-15-2761-2018, 2018
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To bridge the missing links between variable marine elemental stoichiometry, phytoplankton physiology and carbon cycling, we embed four environmentally controlled stoichiometric models into a five-box ocean model. As predicted each model varied in its influence on the biological pump. Surprisingly, we found that variation can lead to nonlinear controls on atmospheric CO2 and carbon export, suggesting the need for further studies of ocean C : P and the impact on ocean carbon cycling.
Luke Gregor, Schalk Kok, and Pedro M. S. Monteiro
Biogeosciences, 15, 2361–2378, https://doi.org/10.5194/bg-15-2361-2018, https://doi.org/10.5194/bg-15-2361-2018, 2018
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The Southern Ocean accounts for a large portion of the variability in oceanic CO2 uptake. However, the drivers of these changes are not understood due to a lack of observations. In this study, we used an ensemble of gap-filling methods to estimate surface CO2. We found that winter was a more important driver of longer-term variability driven by changes in wind stress. Summer variability of CO2 was driven primarily by increases in primary production.
Erik T. Buitenhuis, Parvadha Suntharalingam, and Corinne Le Quéré
Biogeosciences, 15, 2161–2175, https://doi.org/10.5194/bg-15-2161-2018, https://doi.org/10.5194/bg-15-2161-2018, 2018
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Thanks to decreases in CFC concentrations, N2O is now the third-most important greenhouse gas, and the dominant contributor to stratospheric ozone depletion. Here we estimate the ocean–atmosphere N2O flux. We find that an estimate based on observations alone has a large uncertainty. By combining observations and a range of model simulations we find that the uncertainty is much reduced to 2.45 ± 0.8 Tg N yr−1, and better constrained and at the lower end of the estimate in the latest IPCC report.
Sayaka Yasunaka, Eko Siswanto, Are Olsen, Mario Hoppema, Eiji Watanabe, Agneta Fransson, Melissa Chierici, Akihiko Murata, Siv K. Lauvset, Rik Wanninkhof, Taro Takahashi, Naohiro Kosugi, Abdirahman M. Omar, Steven van Heuven, and Jeremy T. Mathis
Biogeosciences, 15, 1643–1661, https://doi.org/10.5194/bg-15-1643-2018, https://doi.org/10.5194/bg-15-1643-2018, 2018
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We estimated monthly air–sea CO2 fluxes in the Arctic Ocean and its adjacent seas north of 60° N from 1997 to 2014, after mapping pCO2 in the surface water using a self-organizing map technique. The addition of Chl a as a parameter enabled us to improve the estimate of pCO2 via better representation of its decline in spring. The uncertainty in the CO2 flux estimate was reduced, and a net annual Arctic Ocean CO2 uptake of 180 ± 130 Tg C y−1 was determined to be significant.
Alizée Roobaert, Goulven G. Laruelle, Peter Landschützer, and Pierre Regnier
Biogeosciences, 15, 1701–1720, https://doi.org/10.5194/bg-15-1701-2018, https://doi.org/10.5194/bg-15-1701-2018, 2018
Chao Zhang, Huiwang Gao, Xiaohong Yao, Zongbo Shi, Jinhui Shi, Yang Yu, Ling Meng, and Xinyu Guo
Biogeosciences, 15, 749–765, https://doi.org/10.5194/bg-15-749-2018, https://doi.org/10.5194/bg-15-749-2018, 2018
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This study compares the response of phytoplankton growth in the northwest Pacific to those in the Yellow Sea. In general, larger positive responses of phytoplankton induced by combined nutrients (in the subtropical gyre of the northwest Pacific) than those induced by a single nutrient (in the Kuroshio Extension and the Yellow Sea) from the dust are observed. We also emphasize the importance of an increase in bioavailable P stock for phytoplankton growth following dust addition.
Goulven G. Laruelle, Peter Landschützer, Nicolas Gruber, Jean-Louis Tison, Bruno Delille, and Pierre Regnier
Biogeosciences, 14, 4545–4561, https://doi.org/10.5194/bg-14-4545-2017, https://doi.org/10.5194/bg-14-4545-2017, 2017
Melchor González-Dávila, J. Magdalena Santana Casiano, and Francisco Machín
Biogeosciences, 14, 3859–3871, https://doi.org/10.5194/bg-14-3859-2017, https://doi.org/10.5194/bg-14-3859-2017, 2017
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The Mauritanian–Cap Vert upwelling is shown to be sensitive to climate change forcing on upwelling processes, which strongly affects the CO2 surface distribution, ocean acidification rates, and air–sea CO2 exchange. We confirmed an upwelling intensification, an increase in the CO2 outgassing, and an important decrease in the pH of the surface waters. Upwelling areas are poorly studied and VOS lines are shown as one of the most significant contributors to our knowledge of the ocean's response.
Cited articles
Barkan, E. and Luz, B.: High-precision measurements of
Benson, B. B. and Krause Jr., D. K.: The concentration and isotopic
fractionation of oxygen dissolved in freshwater and seawater in equilibrium
with the atmosphere, Limnol. Oceanogr., 29, 620–632, https://doi.org/10.4319/lo.1984.29.3.0620, 1984.
Cai, W.-J. and Dai, M.: Comment on “Enhanced open ocean storage of CO2
from shelf sea pumping”, Science, 306, 1477, https://doi.org/10.1126/science.1102132, 2004.
Carr, M.-E., Friedrichs, M. A. M., Schmeltz, M., Aita, M. N., Antoine, D., Arrigo, K. R., Asanuma, I., Aumont, O., Barber, R., Behrenfeld, M., Bidigare, R., Buitenhuis, E. T., Campbell, J., Ciotti, A., Dierssen, H., Dowell, M., Dunne, J., Esaias, W., Gentili, B., Gregg, W., Groom, S., Hoepffner, N., Ishizaka, J., Kameda, T., Le Quéré, C., Lohrenz, S., Marra, J., Mélin, F., Moore, K., Morel, A., Reddy, T. E., Ryan, J., Scardi, M., Smyth, T., Turpie, K., Tilstone, G., Waters, K., and Yamanaka, Y.: A comparison of global estimates of marine primary
production from ocean color, Deep-Sea Res. Pt. II, 53, 741–770, https://doi.org/10.1016/j.dsr2.2006.01.028, 2006.
Castro-Morales, K. and Kaiser, J.: Using dissolved oxygen concentrations to determine mixed layer depths in the Bellingshausen Sea, Ocean Sci., 8, 1–10, https://doi.org/10.5194/os-8-1-2012, 2012.
Castro-Morales, K., Cassar, N., Shoosmith, D. R., and Kaiser, J.: Biological production in the Bellingshausen Sea from oxygen-to-argon ratios and oxygen triple isotopes, Biogeosciences, 10, 2273–2291, https://doi.org/10.5194/bg-10-2273-2013, 2013.
Chao, S.-Y., Shaw, P.-T., and Wu, S. S.: El Niño modulation of the South China
Sea circulation, Prog. Oceanogr., 38, 51–93, https://doi.org/10.1016/S0079-6611(96)00010-9, 1996a.
Chao, S.-Y., Shaw, P.-T., and Wu, S. S.: Deep water ventilation in the South China
Sea, Deep-Sea Res. Pt. I, 43, 445–466, https://doi.org/10.1016/0967-0637(96)00025-8, 1996b.
Chen, C.-C., Shiah, F.-K., Chung, S.-W., and Liu, K.-K.: Winter phytoplankton blooms
in the shallow mixed layer of the South China Sea enahnced by upwelling.
J. Marine Syst., 59, 97–110, https://doi.org/10.1016/j.jmarsys.2005.09.002, 2006.
Chen, C.-T. A., Liu, K.-K., and Macdonald R.: Continental margin exchanges, in:
Ocean Biogeochemistry: The Role of the Ocean Carbon Cycle in Global Change,
edited by: Fasham, M. J. R., Springer, New York, 53–98, https://doi.org/10.1007/978-3-642-55844-3_4, 2003.
Chen, Y. L.: Spatial and seasonal variations of nitrate-based new production
and primary production in the South China Sea, Deep-Sea Res. Pt. I, 52,
319–340, https://doi.org/10.1016/j.dsr.2004.11.001, 2005.
Craig, H. and Hayward, T.: Oxygen Supersaturation in the Ocean: Biological Versus Physical Contributions, Science, 288, 2028–2031, https://doi.org/10.1126/science.288.5473.2028, 1987.
DeGrandpre, M. D., Olbu, G. J., Beatty, C. M., and Hammar, T. R.: Air-CO2 fluxes on
the US Middle Atlantic Bight, Deep-Sea Res. Pt. II, 49, 4355–4367, https://doi.org/10.1016/S0967-0645(02)00122-4, 2002.
Duce, R. A., Liss, P. S., Merrill, J. T., Atlas, E. L., Buat-Menard, P., Hicks, B. B., Miller, J. M., Prospero, J. M., Arimoto, R., Church, T. M., Ellis, W., Galloway, J. N., Hansen, L., Jickells, T. D., Knap, A. H., Reinhardt, K. H., Schneider, B., Soudine, A., Tokos, J. J., Tsunogai, S., Wollast, R., and Zhou, M.: The atmospheric input of trace species to the world ocean.
Global Biogeochem. Cy., 5, 193–259, https://doi.org/10.1029/91GB01778, 1991.
Emerson S., Quay P. D., Stump C., Wilbur D., and Schudlich R.: Chemical
tracers of productivity and respiration in the subtropical Pacific Ocean,
J. Geophys. Res.-Oceans, 100, 15873–15887, https://doi.org/10.1029/95JC01333, 1995.
Frankignoulle, M. and Borges, A. V.: European continental shelf as a
significant sink for atmospheric carbon dioxide, Global Biogeochem.
Cy., 15, 569–576, https://doi.org/10.1029/2000GB001307,
2001.
Fung, I. Y., Meyn, S. K., Tegen, I., Doney, S. C., John, J. G., and Bishop J. K. B.: Iron
supply and demand in the upper ocean, Global Biogeochem. Cy., 14,
281–296, https://doi.org/10.1029/1999GB900059, 2000.
Gong, G.-C., Liu, K. K., Liu, C.-T., and Pai, S.-C.: The chemical hydrography of
the South China Sea west of Luzon and a comparison with the West Philippine
Sea, TAO, 3, 587–602, https://doi.org/10.3319/TAO.1992.3.4.587(O), 1992.
Gong, G.-C., Chen, Y.-L. L., and Liu, K.-K.: Chemical hydrography and
chlorophyll a distribution in the East China Sea in summer: implications in
nutrient dynamics, Cont. Shelf Res., 16, 1561–1590, https://doi.org/10.1016/0278-4343(96)00005-2, 1996.
Hamme, R. C., Cassar, N., Lance, V. P., Vaillancourt, R. D., Bender, M. L.,
Strutton, P. G., Moore, T. S., DeGrandpre, M. D., Sabine, C. L., Ho, D. T., and
Hargreaves, B. R.: Dissolved
Hendricks, M. B., Bender, M. L., and Barnett, B. A.: Net and gross O2 production
in the Southern Ocean from measurements of biological O2 saturation and
its triple isotope composition, Deep-Sea Res. Pt. I, 51,
1541–1561, https://doi.org/10.1016/j.dsr.2004.06.006, 2004.
Hendricks, M. B., Bender, M. L., Barnett, B. A., Strutton, P., and Chavez F. P.: Triple
oxygen isotope composition of dissolved O2 in the equatorial Pacific: A
tracer of mixing, production, and respiration, J. Geophys.
Res., 110, C12021, https://doi.org/10.1029/2004JC002735,
2005.
Hu, J., Kawamura, H., Hong, H., and Qi, Y.: A Review on the Currents in the
South China Sea: Seasonal Circulation, South China Sea Warm Current and
Kuroshio Intrusion, J. Oceanogr., 56, 607–624, https://doi.org/10.1023/A:1011117531252, 2000.
Hsu, H.-H. and Chen, C.-T.: Observed and projected climate change in Taiwan,
Meteorol. Atmos. Phys., 79, 87–104, https://doi.org/10.1007/s703-002-8230-x, 2002.
Juranek, L. W. and Quay, P. D.: In vitro and in situ gross primary and net
community production in the North Pacific Subtropical Gyre using labelled
and natural abundance isotopes of dissolved O2, Global Biogeochem.
Cy., 19, GB30009, https://doi.org/10.1029/2004GB002384, 2005.
Juranek, L. W. and Quay, P. D.: Using triple isotopes of dissolved oxygen to
evaluate global marine productivity, Annual Rev. Mar. Sci., 5,
503–524, https://doi.org/10.1146/annurev-marine-121211-172430,
2013.
Juranek, L. W., Quay, P. D., Feely, R. A., Lockwood, D., Karl, D. M., and Church,
M. J.: Biological production in the NE Pacific and its influence on air-sea
CO2 flux: Evidence from dissolved oxygen isotopes and
Jurikova, H., Guha, T., Abe, O., Shiah, F.-K., Wang, C.-H., and Liang, M.-C.: Variations in triple isotope composition of dissolved oxygen and primary production in a subtropical reservoir, Biogeosciences, 13, 6683–6698, https://doi.org/10.5194/bg-13-6683-2016, 2016.
Kaiser, J.: Technical note: Consistent calculation of aquatic gross production from oxygen triple isotope measurements, Biogeosciences, 8, 1793–1811, https://doi.org/10.5194/bg-8-1793-2011, 2011.
Kaiser, J., Reuer, M. K., Barnett, B., and Bender, M. L.: Marine productivity
estimates from
Karl, D. M. and Lukas, R.: The Hawaii Ocean Time-series (HOT) program:
Background, rationale and field implementation, Deep-Sea Res. Pt. II, 43, 129–156, https://doi.org/10.1016/0967-0645(96)00005-7, 1996.
Karl, D. M., Laws, E. A., Morris, P., Williams, P. J. L. B., and Emerson, S.: Metabolic
balance in the open sea, Nature, 462, 32, https://doi.org/10.1038/426032a, 2003.
Lai, C.-C., Wu, C.-R., Chuang, C.-Y., Tai, J.-H., Lee, K.-Y., Kuo, H.-Y., and
Shiah, F.-K.: Phytoplankton and Bacterial Responses to Monsoon-Driven Water
Masses Mixing in the Kuroshio Off the East Coast of Taiwan, Front.
Mar. Sci., 8, 707807, https://doi.org/10.3389/fmars.2021.707807, 2021.
Lämmerzahl, P., Röckmann, T., Brenninkmeijer, C. A. M., Krankowsky, D., and
Mauersberger, K.: Oxygen isotope composition of stratospheric carbon dioxide,
Geophys. Res. Lett., 29, 1582, https://doi.org/10.1029/2001GL014343, 2002.
Laws, E. A.: Photosynthetic quotients, new production and net community
production in the open ocean, Deep-Sea Res. Pt. I, 38, 143–167, https://doi.org/10.1016/0198-0149(91)90059-O, 1991.
Laws, E. A., Landry, M. R., Barber, R. T., Campbell, L., Dickson, M. L., and
Marra, J.: Carbon cycling in primary production bottle incubations:
inferences from grazing experiments and photosynthetic studies using
14C and 18O in the Arabian Sea, Deep-Sea Res. Pt. II, 47,
1339–1352, https://doi.org/10.1016/S0967-0645(99)00146-0,
2000.
Li, H., Wiesner, M. G., Chen, J., Ling, Z., Zhang, J., and Ran, L.: Long-term variation
of mesopelagic biogenic flux in the central South China Sea: Impact of
monsoonal seasonality and mesoscale eddy, Deep-Sea Res. Pt. I, 126,
62–72, https://doi.org/10.1016/j.dsr.2017.05.012, 2017.
Liang, M.-C. and Mahata, S.: Oxygen anomaly in near surface carbon
dioxide reveals deep stratospheric intrusion, Sci. Rep.-UK, 5, 11352,
https://doi.org/10.1038/srep11352, 2015.
Liang, M.-C., Mahata, S., Laskar, A. H., Thiemens, M. H., and Newman, S.: Oxygen
isotope anomaly in tropospheric CO2 and implications for CO2
residence time in the atmosphere and gross primary productivity, Sci.
Rep.-UK, 7, 13180, https://doi.org/10.1038/s41598-017-12774-w, 2017.
Lin, I.-I., Liu, W. T., Wu, C.-C., Wong, G. T. F., Hu, C., Chen, Z., Liang, W.-D.,
Yang, Y., and Liu, K.-K.: New evidence for enhanced ocean primary production
triggered by tropical cyclone, Geophys. Res. Lett., 30, 1718,
https://doi.org/10.1029/2003GL017141, 2003.
Lin, I.-I., Chen, J.-P., Wong, G. T. F., Huang, C.-W., and Lien, C.-C.: Aerosol input
to the South China Sea: Results from the MODerate Resolution Imaging
Spectro-radiometer, the quick Scatterometer, and the Measurements of
Pollution in the Troposphere Sensor, Deep-Sea Res. Pt. II, 54,
1589–1601, https://doi.org/10.1016/j.dsr2.2007.05.013, 2007.
Lin, I.-I., Lien, C.-C., Wu, C.-R., Wong, G. T. F., Huang, C.-W., and Chiang, T.-L.:
Enhanced primary production in the oligotrophic South China Sea by eddy
injection in spring, Geophys. Res. Lett., 37, L16602, https://doi.org/10.1029/2010GL043872, 2010.
Liu, K.-K., Atkinson, L., Chen, C. T. A., Gao, S., Hall, J., MacDonald, R. W.,
McManus, L. T., and Quiñones, R.: Exploring continental margin carbon fluxes on
a global scale, EOS, 81, 641–644, https://doi.org/10.1029/EO081i052p00641-01, 2000.
Liu, K.-K., Chao, S.-Y., Shaw, P. T., Gong, G.-C., Chen, C.-C., and Tang, T. Y.:
Monsoon-forced chlorophyll distribution and primary production in the South
China Sea: observations and a numerical study, Deep-Sea Res. Pt. I, 49,
1387–1412, https://doi.org/10.1016/S0967-0637(02)00035-3,
2002.
Lorenzen, C. J.: Chlorophyll b in the eastern North Pacific Ocean, Deep-Sea
Res., 28A, 1049–1056, https://doi.org/10.1016/0198-0149(81)90017-0, 1981.
Luz, B. and Barkan, E.: Assessment of Oceanic Productivity with the
Triple-Isotope Composition of Dissolved Oxygen, Science, 288, 2028–2031,
https://doi.org/10.1126/science.288.5473.2028, 2000.
Luz, B. and Barkan, E.: The isotopic ratios
Luz, B. and Barkan, E.: Proper estimation of marine gross O2 production
with
Luz, B., Barkan, E., Bender, M. L., Thiemens, M. H., and Boering, K. A.:
Triple-isotope composition of atmospheric oxygen as a tracer of biosphere
productivity, Nature, 400, 547–550, https://doi.org/10.1038/22987, 1999.
Luz, B., Barkan, E., Sagi, Y., and Yacobi, Y. Z.: Evaluation of community
respiratory mechanisms with oxygen isotopes: A case study in Lake Kinneret,
Limnol. Oceanogr., 47, 33–42, https://doi.org/10.4319/lo.2002.47.1.0033, 2002.
Mahata, S., Bhattacharya, S. K., Wang, C.-H., and Liang, M.-C.: An improved
CeO2 method for high-precision measurements of
Marra, J.: Approaches to the measurement of plankton production,
Phytoplankton productivity: carbon assimilation in marine and freshwater
ecosystem, edited by: Willams, P. J. le B., Thomas, D. N., and Reynolds, C. S.,
Cambridge, Blackwells, 78–108, https://doi.org/10.1002/9780470995204.ch4, 2002.
Nicholson, D., Stanley, R. H. R., and Doney, S. C.: The triple oxygen isotope
tracer of primary productivity in a dynamic ocean model: Triple oxygen
isotopes in a global model, Global Biogeochem. Cy., 28, 538–552,
https://doi.org/10.1002/2013GB004704, 2014.
Ning, X., Chai, F., Xue, H., Cai, Y., Liu, C., and Shi, J.: Physical-biological
oceanographic coupling influencing phytoplankton and primary production in
the South China Sea, J. Geophys. Res., 1009, C10005,
https://doi.org/10.1029/2004JC002365, 2004.
Pai, S. C., Gong, G. C., and Liu, K. K.: Determination of dissolved oxygen in
seawater by direct spectrophotometry of total iodine, Mar. Chem., 41,
343–351, https://doi.org/10.1016/0304-4203(93)90266-Q, 1993.
Prokopenko, M. G., Pauluis, O. M., Granger, J., and Yeung, L. Y.: Exact
evaluation of gross photosynthetic production from the oxygen triple-isotope
composition of O2: Implications for the net-to-gross primary production
ratios, Geophys. Res. Lett., 38, L14603, https://doi.org/10.1029/2011GL047652, 2011.
Qin, C., Zhang, G., Zheng, W., Han, Y., and Liu, S.: High-resolution distributions of
Qu, T., Mitsudera, H., and Yamagata, T.: Intrusion of the North Pacific waters into
the South China Sea, J. Geophys. Res., 105, 6415–6424,
https://doi.org/10.1029/1999JC900323, 2000.
Qu, T., Du, Y., Meyers, G., Ishida, A., and Wang, D.: Connecting the tropical
Pacific with Indian Ocean through South China Sea, Geophys. Res.
Lett., 32, L24609, https://doi.org/10.1029/2005GL024698, 2005.
Quay, P. D., Peacock, C., Björkman, K., and Karl, D. M.: Measuring primary
production rates in the ocean: Enigmatic results between incubation and
non-incubation methods at Station ALOHA, Global Biogeochem. Cy., 24,
GB3014, https://doi.org/10.1029/2009GB003665, 2010.
Regaudie-de-Gioux, A., Lasternas, S., Augustí, S., and Duarte, C. M.:
Comparing marine primary production estimates through different methods and
development of conversion equations, Frontiers in Marine Science, 1, 19,
https://doi.org/10.3389/fmars.2014.00019, 2014.
Rehder, G. and Suess, E.: Methane and pCO2 in the Kuroshio and the South
China Sea during maximum summer surface temperatures, Mar. Chem., 75,
89–108, https://doi.org/10.1016/S0304-4203(01)00026-3, 2001.
Reuer, M. K., Barnett, B. A., Bender, M. L., Falkowski, P. G., and Hendricks, M. B.: New
estimates of Southern Ocean biological production rates from
Sarma, V. V. S. S., Abe, O., Hashimoto, S., Hinuma, A., and Saino, T.: Seasonal
variations in triple oxygen isotopes and gross oxygen production in the
Sagami Bay, central Japan, Limnol. Oceanogr., 50, 544–552,
https://doi.org/10.4319/lo.2005.50.2.0544, 2005.
Schlitzer, R.: Ocean Data View, https://odv.awi.de/, last access: April 2020.
Seguro, I., Marca, A. D., Painting, S. J., Shutler, J., Suggett, D. J., and Kaiser,
J.: High-resolution net and gross biological production during a Celtic Sea
spring bloom, Prog. Oceanogr., 177, 101885, https://doi.org/10.1016/j.pocean.2017.12.003, 2019.
Shang, S., Zhang, C., Hong, H., Liu, Q., Wong, G. T. F., Hu, C., and Huang, B.:
Hydrographic and biological changes in the Taiwan Strait during the
1997–1998 El Niño winter, Geophys. Res. Lett., 32, L11601,
https://doi.org/10.1029/2005GL022578, 2005.
Shiah, F.-K., Liu, K.-K., and Tang, T.-Y.: South East Asian Time-series Station
established in South China Sea, US JGOFS Newsletter, 10, 8–9, 1999.
Stanley, R. H. R., Kirkpatrick, J. B., Cassar, N., Barnett, B. A., and Bender, M.
L.: Net community production and gross primary production rates in the
western equatorial Pacific, Global Biogeochem. Cy., 24, GB4001,
https://doi.org/10.1029/2009GB003651, 2010.
Steeman-Nielsen, E.: The use of radioactive carbon (14C) for measuring
organic production in the sea, ICES J. Mar. Sci., 18, 117–140, https://doi.org/10.1093/icesjms/18.2.117, 1952.
Strickland, J. D. H. and Parsons, T. R.: A Practical Handbook of Seawater
Analysis, Bulletin 167, 2nd Edn., edited by: Stevenson, J. C., Fisheries Research Board of Canada,
Ottawa, 1972.
Suga, T., Kato, A., and Hanawa, K.: North Pacific Tropical Water: its climatology
and temporal changes associated with the climate regime shift in the 1970s,
Prog. Oceanogr., 47, 223–256, https://doi.org/10.1016/S0079-6611(00)00037-9, 2003.
Tai, J.-H., Wong, G. T. F., and Pan, X.: Upper water structure and mixed layer
depth in tropical waters: The SEATS station in the northern South China Sea, TAO, 28, 1019–1032,
https://doi.org/10.3319/TAO.2017.01.09.01, 2017.
Tai, J.-H., Chou, W.-C., Hung, C.-C., Wu, K.-C., Chen, Y.-H., Chen, T.-Y., Gong,
G.-C., Shiah, F.-K., and Chow, C. H.: Short-term variability of biological
production and CO2 system around Dongsha Atoll of the northern South
China Sea: Impact of topography-flow interation, Front. Mar.
Sci., 7, 511, https://doi.org/10.3389/fmars.2020.00511,
2020.
Thomas, H., Bozec, Y., Elkalay, K., and de Baar, H. J. W.: Enhanced Open Ocean Storage
of CO2 from Shelf Sea Pumping, Science, 304, 1005–1008, https://doi.org/10.1126/science.1095491, 2004.
Tseng, C.-M., Wong, G. T. F., Lin, I.-I., Wu, C.-R., and Liu, K.-K.: A unique
seasonal pattern in phytoplankton biomass in low-latitude waters in the
South China Sea, Geophys. Res. Lett., 32, L08608, https://doi.org/10.1029/2004GL022111, 2005.
Tseng, C.-M., Wong, G. T. F., Chou, W.-C., Lee, B.-S., Sheu, D.-D., and Liu, K.-K.:
Temporal variations in the carbonate system in the upper layer at the SEATS,
Deep-Sea Res. Pt. II, 54, 1448–1468, https://doi.org/10.1016/j.dsr2.2007.05.003, 2007.
Tseng, C.-M., Liu, K.-K., Wang, L.-W., and Gong, G.-C.: Anomalous hydrographic and
biological conditions in the northern South China Sea during the 1997–1998
El Niño and comparisons with the equatorial Pacific, Deep-Sea Res. Pt. I, 56, 2129–2143, https://doi.org/10.1016/j.dsr.2009.09.004,
2009.
Tsunogai, S., Watanabe, S., and Sato, T.: Is there a “continental shelf pump”
for the absorption of atmospheric CO2?, Tellus, 51, 701–712, https://doi.org/10.1034/j.1600-0889.1999.t01-2-00010.x, 1999.
Wang, S.-L., Chen, C.-T. A., Hong, G.-H., and Chung, C.-S.: Carbon dioxide
related parameters in the East China Sea, Cont. Shelf Res., 2000,
525–544, https://doi.org/10.1016/S0278-4343(99)00084-9, 2000.
Wanninkhof, R., Asher, W. E., Ho, D. T., Sweeney, C., and McGillis, W. R.:
Advances in quantifying air-sea gas exchange and environmental forcing,
Annu. Rev. Mar. Sci., 1, 213–244, https://doi.org/10.1146/annurev.marine.010908.163742, 2009.
Wong, G. T. F., Ku, T.-L., Mulholland, M., Tseng, C. M., and Wang, D.-P.: The
SouthEast Asian Time-series Study (SEATS) and the biogeochemistry of the
South China Sea – An overview, Deep-Sea Res. Pt. II, 54, 1434–1447,
https://doi.org/10.1016/j.dsr2.2007.05.012, 2007a.
Wong, G. T. F., Tseng, C.-M., Wen, L.-S., and Chung, S.-W.: Nutrient dynamics and
N-anomaly at the SEATS station, Deep-Sea Res. Pt. II, 54, 1528–1545,
https://doi.org/10.1016/j.dsr2.2007.05.011, 2007b.
Wurgaft, E., Shamir, O., Barkan, E., Paldor, N., and Luz, B.: Mixing processes in
the deep water of the Gulf of Elat (Aqaba): evidence from measurements and
modelling of the triple isotopic composition of dissolved oxygen, Limnol. Oceanogr., 58, 1373–1386, https://doi.org/10.4319/lo.2013.58.4.1373, 2013.
Xu, M., Chang, C.-P., Fu, C., Qi, Y., Robock, A., Robinson, D., and Zhang, H.-M.:
Steady decline of east Asian monsoon winds, 1969–2000: Evidence from direct
ground measurements of wind speed, J. Geophys. Res., 111,
D24111, https://doi.org/10.1029/2006JD007337, 2006.
Yool, A. and Fasham, M. J. R.: An examination of the “Continental shelf pump”
in an open ocean general circulation model, Global Biogeochem. Cy., 15,
831–844, https://doi.org/10.1029/2000GB001359, 2001.
You, Y.: The pathway and circulation of North Pacific Intermediate Water,
Geophys. Res. Lett., 30, 2291, https://doi.org/10.1029/2003GL018561, 2003.
Zhai, W., Dai, M., Cai, W.-J., Wang, Y., and Hong, H.: The partial pressure of carbon
dioxide and air-sea fluxes in the northern South China Sea in spring, summer
and autumn, Mar. Chem., 96, 87–97, https://doi.org/10.1016/j.marchem.2004.12.002, 2005.
Zhou, W. and Chan, J. C. L.: ENSO and the South China Sea summer monsoon
onset, Int. J. Climatol., 27, 157–167, https://doi.org/10.1002/joc.1380, 2007.
Short summary
We studied the isotopic composition of oxygen dissolved in seawater in the South China Sea. This tells us about the origin of oxygen in the water column, distinguishing between biological oxygen produced by phytoplankton communities and atmospheric oxygen entering seawater through gas exchange. We found that the East Asian Monsoon plays an important role in determining the amount of oxygen produced vs. consumed by the phytoplankton, as well as in inducing vertical water mass mixing.
We studied the isotopic composition of oxygen dissolved in seawater in the South China Sea. This...
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