Effects of phytoplankton community composition and productivity on sea surface pCO(2) variations in the Southern Ocean

Takao, Shintaro; Nakaoka, Shin-Ichiro; Hashihama, Fuminori; Shimada, Keishi; Yoshikawa-Inoue, Hisayuki; Hirawake, Toru; Kanda, Jota; Hashida, Gen; Suzuki, Koji

Effects of phytoplankton community composition and productivity on sea surface pCO(2) variations in the Southern Ocean

Takao, Shintaro; Nakaoka, Shin-Ichiro; Hashihama, Fuminori et al.

Deep Sea Research Part I Oceanographic Research Papers, 2020, 160, 103263

Permalink : https://hdl.handle.net/2115/78754

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アクセス権	open access
URI	https://hdl.handle.net/2115/78754
タイトル	Effects of phytoplankton community composition and productivity on sea surface pCO(2) variations in the Southern Ocean
著者	Takao, Shintaro ; Nakaoka, Shin-Ichiro ; Hashihama, Fuminori ; Shimada, Keishi ; Yoshikawa-Inoue, Hisayuki ; Hirawake, Toru ; Kanda, Jota ; Hashida, Gen ; Suzuki, Koji
著者名 Takao, Shintaro
e-Rad_Researcher 00450164 著者名 Nakaoka, Shin-Ichiro
e-Rad_Researcher 80535807 著者名 Hashihama, Fuminori
e-Rad_Researcher 30567037 著者名 Shimada, Keishi
e-Rad_Researcher 60344496 著者名 Yoshikawa-Inoue, Hisayuki
e-Rad_Researcher 70311165 著者名 Hirawake, Toru
e-Rad_Researcher 60202032 著者名 Kanda, Jota
e-Rad_Researcher 00280537 著者名 Hashida, Gen
e-Rad_Researcher 40283452 著者名 Suzuki, Koji
言語	英語
キーワード	Phytoplankton community composition
	Diatoms
	Southern Ocean
	Net primary productivity
	Carbon dioxide
発行日	2020-06
出版者	Elsevier
収録物名	Deep Sea Research Part I Oceanographic Research Papers
巻(号)	160
ページ	103263
抄録	The Southern Ocean is a vast net sink for atmospheric carbon dioxide (CO2), with marine phytoplankton playing a crucial role in CO2 fixation. We assessed how changes in the dominant phytoplankton community and net primary productivity (NPP) affected variations in the partial pressure of CO2 in surface water (pCO(2)(sw)) in the Indian sector of the Southern Ocean during austral summer. pCO2sw was negatively correlated with total phytoplankton and diatom abundances, as estimated from pigment signatures, in the zone south of the Antarctic Circumpolar Current; however, pCO(2)(sw) was not correlated with haptophyte abundance. Additionally, a stronger correlation was found between pCO(2)(sw) and total phytoplankton NPP than between chlorophyll a concentration and pCO(2)(sw). We reconstructed pCO(2)(sw) at inter-annual scale using satellite data and assessed the inter-annual variability of air-sea CO2 flux. Over the period from 1997 to 2007, the integrated CO2 fluxes over the study region showed very large variations from a small source to a strong sink. Variations in the integrated CO2 fluxes were also correlated with changes in satellite-derived phytoplankton community in the Indian sector of the Southern Ocean and changes in the dominant phytoplankton community may control CO2 dynamics in the marginal ice zone.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
権利情報	© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	0967-0637
NCID	AA11529523
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1016/j.dsr.2020.103263