Journal
SCIENCE
Volume 328, Issue 5982, Pages 1147-1151Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1183627
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Funding
- Royal Society
- Natural Environment Research Council [1245.1007]
- ANU
- Christ's College
- Centre National de la Recherche Scientifique
- Institut National des Sciences de l'Univers
- Commissariat a l'Energie Atomique
- Natural Environment Research Council [NRCF010001] Funding Source: researchfish
- NERC [NRCF010001] Funding Source: UKRI
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Past glacial-interglacial increases in the concentration of atmospheric carbon dioxide (CO2) are thought to arise from the rapid release of CO2 sequestered in the deep sea, primarily via the Southern Ocean. Here, we present radiocarbon evidence from the Atlantic sector of the Southern Ocean that strongly supports this hypothesis. We show that during the last glacial period, deep water circulating around Antarctica was more than two times older than today relative to the atmosphere. During deglaciation, the dissipation of this old and presumably CO2-enriched deep water played an important role in the pulsed rise of atmospheric CO2 through its variable influence on the upwelling branch of the Antarctic overturning circulation.
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