GreenICE sediment cores reveal reduced last Interglacial Arctic sea ice cover

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

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedings

Abstract

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.
Original languageEnglish
Title of host publicationArctic sea ice thickness: Past, present and future
EditorsPeter Wadhams, Georgios Amanatidis
Place of PublicationBrussels
PublisherEuropean Commission
Pages114-135
Number of pages22
ISBN (Print)92-79-02803-0
Publication statusPublished - 2006
EventInternational Workshop on Arctic Sea Ice Thikness: Past and present - Rungstedgaard Conference Centre, Rungsted, Denmark
Duration: 8 Nov 20059 Nov 2005

Publication series

NameClimate Change and Natural Hazards Series
PublisherEuropean Commission
Volume10

Conference

ConferenceInternational Workshop on Arctic Sea Ice Thikness: Past and present
Country/TerritoryDenmark
CityRungsted
Period8/11/059/11/05

Programme Area

  • Programme Area 5: Nature and Climate

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