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

H. Ebbesen, A. Kuijpers, M. Moros, J. Lloyd, M.-S. Seidenkrantz, S. Troelstra

Publikation: Bidrag til tidsskriftArtikelForskning

Abstrakt

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.
OriginalsprogEngelsk
Sider (fra-til)1219–1235
Antal sider17
TidsskriftClimate of the Past Discussions
Vol/bind4
DOI
StatusAfsendt - 2008

Programområde

  • Programområde 5: Natur og klima

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