Enhance seasonal amplitude of atmospheric CO2 by the changing Southern Ocean carbon sink

Type Article
Date 2022-10
Language English
Author(s) Yun JeongminORCID1, 2, Jeong SujongORCID1, 2, Gruber NicolasORCID3, Gregor LukeORCID3, Ho Chang-HoiORCID4, Piao ShilongORCID5, 6, Ciais PhilippeORCID7, Schimel DavidORCID8, Kwon Eun YoungORCID9, 10
Affiliation(s) 1 : Department of Environmental Planning, Graduate School of Environmental Studies, Seoul National University, Seoul, Republic of Korea.
2 : Environmental Planning Institute, Seoul National University, Seoul, Republic of Korea.
3 : Environmental Physics, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland.
4 : School of Earth and Environmental Sciences, Seoul National University, Seoul, Republic of Korea.
5 : Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China.
6 : Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China.
7 : Laboratoire des Sciences du Climat et de l’Environnement, CEA CNRS UVSQ, Gif-sur-Yvette, France.
8 : Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91101, USA.
9 : Center for Climate Physics, Institute for Basic Science, Busan, Republic of Korea.
10 : Pusan National University, Busan, Republic of Korea.
Source Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2022-10 , Vol. 8 , N. 41 , P. eabq0220 (12p.)
DOI 10.1126/sciadv.abq0220
WOS© Times Cited 6
Abstract

The enhanced seasonal amplitude of atmospheric CO 2 has been viewed so far primarily as a Northern Hemisphere phenomenon. Yet, analyses of atmospheric CO 2 records from 49 stations between 1980 and 2018 reveal substantial trends and variations in this amplitude globally. While no significant trends can be discerned before 2000 in most places, strong positive trends emerge after 2000 in the southern high latitudes. Using factorial simulations with an atmospheric transport model and analyses of surface ocean P co 2 observations, we show that the increase is best explained by the onset of increasing seasonality of air-sea CO 2 exchange over the Southern Ocean around 2000. Underlying these changes is the long-term ocean acidification trend that tends to enhance the seasonality of the air-sea fluxes, but this trend is modified by the decadal variability of the Southern Ocean carbon sink. The seasonal variations of atmospheric CO 2 thus emerge as a sensitive recorder of the variations of the Southern Ocean carbon sink.

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Yun Jeongmin, Jeong Sujong, Gruber Nicolas, Gregor Luke, Ho Chang-Hoi, Piao Shilong, Ciais Philippe, Schimel David, Kwon Eun Young (2022). Enhance seasonal amplitude of atmospheric CO2 by the changing Southern Ocean carbon sink. Science Advances, 8(41), eabq0220 (12p.). Publisher's official version : https://doi.org/10.1126/sciadv.abq0220 , Open Access version : https://archimer.ifremer.fr/doc/00801/91321/