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Simulation of fast-flow features of the Fennoscandian ice sheet during the Last Glacial Maximum

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Title: Simulation of fast-flow features of the Fennoscandian ice sheet during the Last Glacial Maximum
Authors: Forsström, Pirjo-Leena Browse this author
Sallasmaa, Olli Browse this author
Greve, Ralf Browse this author →KAKEN DB
Zwinger, Thomas Browse this author
Keywords: Fennoscandian ice sheet
Scandinavian ice sheet
Last Glacial Maximum
Fast flow
Ice stream
Issue Date: 1-Jun-2003
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 37
Issue: 1
Start Page: 383
End Page: 389
Publisher DOI: 10.3189/172756403781815500
Abstract: In order to reconstruct the palaeoglaciation in Fennoscandia and northern Asia during the late-Weichselian ice-age phase, simulations with the dynamic and thermodynamic ice-sheet model SICOPOLIS are carried out. Our focus is on the Last Glacial Maximum (LGM) around 20 kyr BP. Climate forcing is based on mean annual surface temperature and precipitation derived from present data and Palaeoclimatic Modelling Intercomparison Project (PMIP) UKMO21 results for the LGM. These distributions are interpolated via a glacial index defined by the Greenland Icecore Project (GRIP) δ18 O record. The extent of the Scandinavian and the Barents ice sheets is reproduced in good agreement with the Quaternary Environments of the Eurasian North (QUEEN) reconstruction, but the Kara Sea and Taymyr Peninsula areas are excessively glaciated. The fast-flow regions derived from the simulations, which are generally connected to regions with a temperate base and temperate ice above, are compared to hypothesized palaeoice-stream locations, especially in the Norwegian Channel and the Baltic area. In the Norwegian Channel, temperate basal conditions with temperate ice above prevail and favour fast flow. In the Baltic area, ice-sheet advance is generally accompanied by slow ice velocities (<200 m a-1). Some temporary fast-flow features occur due to transitional temperate-base conditions, and higher velocities arise in retreat phases.
Rights: © 2003 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

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