Journal
SCIENCE
Volume 349, Issue 6253, Pages 1221-1224Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aab2620
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Funding
- European Union (EU) from the European Commission's Seventh Framework Programme [264879, 283080]
- ETH [CH2-01 11-1]
- Climate Observation Division of NOAA
- NOAA [NA10OAR4320143]
- U.S. National Science Foundation's Office of Polar Programs [AOAS 0944761, AOAS 0636975]
- Antarctic Climate and Ecosystems CRC
- Australian Climate Change Science Program
- Integrated Marine Observing System
- Institut National des Sciences de l'Univers/Centre National de la Recherche Scientifique
- Institut Polaire Francaise for the Ocean Indien Service d'Observation cruises
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1341647] Funding Source: National Science Foundation
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Several studies have suggested that the carbon sink in the Southern Ocean-the ocean's strongest region for the uptake of anthropogenic CO2-has weakened in recent decades. We demonstrated, on the basis of multidecadal analyses of surface ocean CO2 observations, that this weakening trend stopped around 2002, and by 2012 the Southern Ocean had regained its expected strength based on the growth of atmospheric CO2. All three Southern Ocean sectors have contributed to this reinvigoration of the carbon sink, yet differences in the processes between sectors exist, related to a tendency toward a zonally more asymmetric atmospheric circulation. The large decadal variations in the Southern Ocean carbon sink suggest a rather dynamic ocean carbon cycle that varies more in time than previously recognized.
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