GreenICE sediment cores reveal reduced last Interglacial Arctic sea ice cover

Niels Nørgaard-Pedersen, Naja Mikkelsen, Susanne J. Lassen, Emma Sheldon, Yngve Kristoffersen

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedings

Abstrakt

We present a sediment record of the last ca. 200,000 years from the
southernmost part of the Lomonosov Ridge off the northern Greenland/Canada continental margin. Evident cyclic changes in hemipelagic sediment types and microfossil content reflect changing glacial-interglacial ice cover characteristics and shifting paleoceanographic circulation patterns. Increased input of coarse ice-rafted debris, from mainly northern Canada, appears to be related to glacial marine isotope stages 6, 4, and late 3. Interglacial stages 7, 5e, and 1, as well as warm interstadial 5a and mid stage 3 were characterised by deposition of
fine-grained sediment with abundant planktic foraminifera suggesting less severe ice conditions. The occurrence of abundant small (>63μm) subpolar Turborotalita quinqueloba in the intervals representing substages 5e (last interglacial) and 5a (warm interstadial) implies that last interglacial sea ice concentrations were considerably reduced off some areas of northern Greenland/Canada. Whether this was part of a larger regional pattern or it represents the influence of extensive polynya areas with locally increased primary productivity remains to be solved.
OriginalsprogEngelsk
TitelArctic sea ice thickness: Past, present and future
RedaktørerPeter Wadhams, Georgios Amanatidis
UdgivelsesstedBrussels
ForlagEuropean Commission
Sider114-135
Antal sider22
ISBN (Trykt)92-79-02803-0
StatusUdgivet - 2006
BegivenhedInternational Workshop on Arctic Sea Ice Thikness: Past and present - Rungstedgaard Conference Centre, Rungsted, Danmark
Varighed: 8 nov. 20059 nov. 2005

Publikationsserier

NavnClimate Change and Natural Hazards Series
ForlagEuropean Commission
Vol/bind10

Konference

KonferenceInternational Workshop on Arctic Sea Ice Thikness: Past and present
Land/OmrådeDanmark
ByRungsted
Periode8/11/059/11/05

Programområde

  • Programområde 5: Natur og klima

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