Enhance seasonal amplitude of atmospheric CO2 by the changing 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

Issue Date
American Association for the Advancement of Science
Science Advances, Vol.8 No.41
The enhanced seasonal amplitude of atmospheric CO2 has been viewed so far primarily as a Northern Hemisphere phenomenon. Yet, analyses of atmospheric CO2 records from 49 stations between 1980 and 2018 reveal substan-tial 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 Pco2 observations, we show that the increase is best explained by the onset of increasing seasonality of air-sea CO2 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 CO2 thus emerge as a sensitive recorder of the variations of the Southern Ocean carbon sink.
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College of Natural Sciences (자연과학대학)Dept. of Earth and Environmental Sciences (지구환경과학부)Journal Papers (저널논문_지구환경과학부)
Graduate School of Environmental Studies (환경대학원)Dept. of Environmental Planning (환경계획학과)Journal Papers (저널논문_환경계획학과)
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