The Deglacial Evolution of North Atlantic Deep Convection
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Material Information

Title:
The Deglacial Evolution of North Atlantic Deep Convection
Creator:
David J.R. Thornalley
Stephen Barker
Wallace S. Broecker
Henry Elderfield
I. Nick McCave
Place of Publication:
1200 New York Avenue NW, Washigton, DC 20005
Publisher:
American Association for the Advancement of Science
Publication Date:

Notes

Abstract:
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 (14C)–depleted watermass, 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. ( English )

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Source Institution:
Florida International University
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