Journal
SCIENCE
Volume 331, Issue 6014, Pages 202-205Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1196812
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Funding
- NERC [NER/T/S/2002/00436, NE/F002734/1]
- National Science Foundation [OCE 04-35703]
- Natural Environment Research Council [NRCF010001, NE/F002734/1, NE/D001803/1] Funding Source: researchfish
- NERC [NE/D001803/1, NE/F002734/1, NRCF010001] Funding Source: UKRI
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Deepwater formation in the North Atlantic by open-ocean convection is an essential component of the overturning circulation of the Atlantic Ocean, which helps regulate global climate. We use water-column radiocarbon reconstructions to examine changes in northeast Atlantic convection since the Last Glacial Maximum. During cold intervals, we infer a reduction in open-ocean convection and an associated incursion of an extremely radiocarbon (C-14)-depleted water mass, interpreted to be Antarctic Intermediate Water. Comparing the timing of deep convection changes in the northeast and northwest Atlantic, we suggest that, despite a strong control on Greenland temperature by northeast Atlantic convection, reduced open-ocean convection in both the northwest and northeast Atlantic is necessary to account for contemporaneous perturbations in atmospheric circulation.
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