Enhanced sea-ice export from the Arctic during the Younger Dryas

Christelle Not and Claude Hillaire-Marcel ()
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Christelle Not: GEOTOP, Université du Québec à Montréal, C.P. 8888 Succ. Centre-Ville
Claude Hillaire-Marcel: GEOTOP, Université du Québec à Montréal, C.P. 8888 Succ. Centre-Ville

Nature Communications, 2012, vol. 3, issue 1, 1-5

Abstract: Abstract The Younger Dryas cold spell of the last deglaciation and related slowing of the Atlantic meridional overturning circulation have been linked to a large array of processes, notably an influx of fresh water into the North Atlantic related to partial drainage of glacial Lake Agassiz. Here we observe a major drainage event, in marine sediment cores raised from the Lomonosov Ridge, in the central Arctic Ocean marked by a pulse in detrital dolomitic-limestones. This points to an Arctic-Canadian sediment source area with about fivefold higher Younger Dryas ice-rafting deposition rate, in comparison with the Holocene. Our findings thus support the hypothesis of a glacial drainage event in the Canadian Arctic area, at the onset of the Younger Dryas, enhancing sea-ice production and drifting through the Arctic, then export through Fram Strait, towards Atlantic meridional overturning circulation sites of the northern North Atlantic.

Date: 2012
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DOI: 10.1038/ncomms1658

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