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

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Title: Effects of phytoplankton community composition and productivity on sea surface pCO(2) variations in the Southern Ocean
Authors: Takao, Shintaro Browse this author
Nakaoka, Shin-Ichiro Browse this author →KAKEN DB
Hashihama, Fuminori Browse this author →KAKEN DB
Shimada, Keishi Browse this author →KAKEN DB
Yoshikawa-Inoue, Hisayuki Browse this author →KAKEN DB
Hirawake, Toru Browse this author →KAKEN DB
Kanda, Jota Browse this author →KAKEN DB
Hashida, Gen Browse this author →KAKEN DB
Suzuki, Koji Browse this author →KAKEN DB
Keywords: Phytoplankton community composition
Diatoms
Southern Ocean
Net primary productivity
Carbon dioxide
Issue Date: Jun-2020
Publisher: Elsevier
Journal Title: Deep Sea Research Part I Oceanographic Research Papers
Volume: 160
Start Page: 103263
Publisher DOI: 10.1016/j.dsr.2020.103263
Abstract: 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.
Rights: © 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/
http://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/78754
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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