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Surface and Deep Ocean Interactions During the Cold Climate Event 8200 Years Ago | |
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CLIVAR diagram of ocean thermohaline circulation. |
Surface and Deep Ocean Interactions During the Cold Climate Event 8200 Years Ago
Science Vol. 312, Issue 5782, pp. 1929-1932, 30 June 2006. Christopher R. W. Ellison1, Mark R. Chapman1, and Ian R. Hall2 1 School of Environmental Sciences, University of East Anglia (UEA), Norwich, NR4 7TJ, UK. 2 School of Earth, Ocean, and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3YE, UK. |
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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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Download data from the WDC Paleo archive: 8200BP Event Foraminifer Data and Winter/Summer SST Reconstruction in Text or Microsoft Excel format. |
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To read or view the full study, please visit the Science website. It was published in Science, Vol. 312, Issue 5782, pp. 1929-1932, 30 June 2006. |
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http://www.ncdc.noaa.gov/paleo/pubs/ellison2006/ellison2006.html Downloaded Thursday, 01-Aug-2013 19:38:33 EDT Last Updated Friday, 22-Aug-2008 14:37:36 EDT by paleo@noaa.gov Please see the Paleoclimatology Contact Page or the NCDC Contact Page if you have questions or comments. |