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Science. 2006 Jun 30;312(5782):1929-32.

Surface and deep ocean interactions during the cold climate event 8200 years ago.

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  • 1School of Environmental Sciences, University of East Anglia (UEA), Norwich, NR4 7TJ, UK.

Abstract

Evidence from a North Atlantic deep-sea sediment core reveals that the largest climatic perturbation in our present interglacial, the 8200-year event, is marked by two distinct cooling events in the subpolar North Atlantic at 8490 and 8290 years ago. An associated reduction in deep flow speed provides evidence of a significant change to a major downwelling limb of the Atlantic meridional overturning circulation. The existence of a distinct surface freshening signal during these events strongly suggests that the sequenced surface and deep ocean changes were forced by pulsed meltwater outbursts from a multistep final drainage of the proglacial lakes associated with the decaying Laurentide Ice Sheet margin.

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PMID:
16809535
[PubMed]
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