期刊
SCIENTIFIC REPORTS
卷 10, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41598-020-71814-0
关键词
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资金
- Brazilian Ministry of the Environment (MMA)
- Brazilian Ministry of Science, Technology, and Innovation (MCTI)
- Council for Research and Scientific Development of Brazil (CNPq) through grants from the Brazilian National Institute of Science and Technology of Cryosphere (INCT-CRIOSFERA)
- CNPq [888881.195000/2018-01, 573720/2008-8, 465680/2014-3]
- FAPERGS [17/2551-0000518-0]
- NAUTILUS project [405869/2013-4]
- Higher Education Personnel Improvement Coordination (CAPES) [23038.001421/2014-30, 88887.360799/201900]
- CAPES project
- INTERBIOTA project [407889/2013-2]
- PROVOCCAR project [442628/2018-8]
- ECOPELAGOS project [442637/2018-7]
We show an annual overview of the sea-air CO2 exchanges and primary drivers in the Gerlache Strait, a hotspot for climate change that is ecologically important in the northern Antarctic Peninsula. In autumn and winter, episodic upwelling events increase the remineralized carbon in the sea surface, leading the region to act as a moderate or strong CO2 source to the atmosphere of up to 40 mmol m(-2) day(-1). During summer and late spring, photosynthesis decreases the CO2 partial pressure in the surface seawater, enhancing ocean CO2 uptake, which reaches values higher than -40 mmol m(-2) day(-1). Thus, autumn/winter CO2 outgassing is nearly balanced by an only 4-month period of intense ocean CO2 ingassing during summer/spring. Hence, the estimated annual net sea-air CO2 flux from 2002 to 2017 was 1.24 +/- 4.33 mmol m(-2) day(-1), opposing the common CO2 sink behaviour observed in other coastal regions around Antarctica. The main drivers of changes in the surface CO2 system in this region were total dissolved inorganic carbon and total alkalinity, revealing dominant influences of both physical and biological processes. These findings demonstrate the importance of Antarctica coastal zones as summer carbon sinks and emphasize the need to better understand local/regional seasonal sensitivity to the net CO2 flux effect on the Southern Ocean carbon cycle, especially considering the impacts caused by climate change.
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