Report

Surface and Deep Ocean Interactions During the Cold Climate Event 8200 Years Ago

Science  30 Jun 2006:
Vol. 312, Issue 5782, pp. 1929-1932
DOI: 10.1126/science.1127213

You are currently viewing the abstract.

View Full Text

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.

View Full Text

Cited By...