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Seasonal Variations and Drivers of Surface Ocean pCO(2) in the Seasonal Ice Zone of the Eastern Indian Sector, Southern Ocean

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Title: Seasonal Variations and Drivers of Surface Ocean pCO(2) in the Seasonal Ice Zone of the Eastern Indian Sector, Southern Ocean
Authors: Tozawa, Manami Browse this author
Nomura, Daiki Browse this author →KAKEN DB
Nakaoka, Shin-ichiro Browse this author →KAKEN DB
Kiuchi, Masaaki Browse this author
Yamazaki, Kaihe Browse this author
Hirano, Daisuke Browse this author
Aoki, Shigeru Browse this author →KAKEN DB
Sasaki, Hiroko Browse this author
Murase, Hiroto Browse this author
Keywords: carbonate chemistry
sea-air CO2 flux
carbon cycle
Southern Ocean
Issue Date: Jan-2022
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research Oceans
Volume: 127
Issue: 1
Start Page: e2021JC017953
Publisher DOI: 10.1029/2021JC017953
Abstract: To quantitatively assess the inorganic carbon cycle in the eastern Indian sector of the Southern Ocean (80-150 degrees E, south of 60 degrees S), we measured ocean surface temperature, salinity, total alkalinity (TA), the partial pressure of carbon dioxide (pCO(2)), and concentrations of chlorophyll-a (chl a), dissolved inorganic carbon (DIC), and nutrients during the KY18 survey (December 2018-January 2019). The sea-air CO2 flux in this region was -8.3 +/- 12.7 mmol m(-2) day(-1) (-92.1 to +10.6 mmol m(-2) day(-1)). The ocean was therefore a weak CO2 sink. Based on the DIC and TA in the temperature minimum layer, we estimated the change of pCO(2) from winter to summer (delta pCO(2)) due to changes in water temperature, salinity, and biological activity (photosynthesis). The spatial distribution of pCO(2) in the western part (80-110 degrees E) of the study area was mainly driven by biological activity, which decreased pCO(2) from December to early January, and in the eastern part (110-150 degrees E) by temperature, which increased pCO(2) from January to February. We also examined the changes in the CO2 concentrations (xCO(2)) over time by comparing data from 1996 with our data (2018-2019). The oceanic and atmospheric xCO(2) increased by 23 and 45 ppm in 23 years, respectively. These changes of ocean xCO(2) were mainly driven by an increase in CO2 uptake from the atmosphere as a result of the rise in atmospheric xCO(2) and increase in biological activity associated with the change in the water-mass distribution.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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