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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/cpd-4-1219-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/cpd-4-1219-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  27 Oct 2008

27 Oct 2008

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This preprint was under review for the journal CP. A revision for further review has not been submitted.

The 8.2 ka cooling event related to extensive melting of the Greenland Ice Sheet

H. Ebbesen1, A. Kuijpers1, M. Moros2, J. Lloyd3, M.-S. Seidenkrantz4, and S. Troelstra5 H. Ebbesen et al.
  • 1Geological Survey of Denmark and Greenland, Denmark
  • 2Institute for Baltic Sea Research, Warnemünde, Germany
  • 3Department of Geography, University of Durham, UK
  • 4Institute of Geology, Aarhus University, Denmark
  • 5Department of Paleoclimatology and Geomorphology, Vrije Universiteit, The Netherlands

Abstract. The North Atlantic cooling event at 8200 calibrated (cal) yr BP has been attributed to effects of an extensive freshwater discharge from the Hudson Strait (Barber et al., 1999; Leverington et al., 2002). Here we present sedimentary records from 5 cores collected from the Greenland shelf. These document high magnetic susceptibility (MS) values related to massive silt deposition, which is ascribed to large-scale melt water outflow from the Greenland Ice Sheet (GIS) spanning the centuries before 8200 cal yr BP and ending after 8000 cal yr BP. XRF trace element composition and foraminiferal fauna's provide additional evidence for excessive melt-water production, which can be related to early Holocene warming of the circum-Arctic region including Greenland. Planktonic foraminiferal fauna data from the southern Davis Strait indicate the widespread presence of negative salinity anomalies reaching far offshore Greenland. Significant freshening of surface waters around Greenland prior to 8200 cal yr BP must have led to a slowdown of the deep-water formation which thus implies that significant melting of the GIS should be taken into account when discussing driving mechanisms behind the 8200 cal yr BP cooling event.

H. Ebbesen et al.

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