Maximum extent of the Eurasian ice sheets in the Barents and Kara Sea region during the Weichselian |
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| Authors: | JOHN INGE SVENDSEN VALERY I ASTAKHOV DMITRI YU BOLSHIYANOV IGOR DEMIDOV JULIAN A DOWDESWELL VALERY GATAULLIN CHRISTIAN HJORT HANS W HUBBERTEN EILIV LARSEN JAN MANGERUD MARTIN MELLES PER MÖLLER MATTI SAARNISTO MARTIN J SIEGERT |
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| Institution: | Centre for Studies of Environment and Resources, University of Bergen, HØyteknologi-senteret (HIB), N-5020 Bergen, Norway ();Geological Faculty, St. Petersburg University, Universitetskaya 7/9, St. Petersburg 199034, Russian Federation;Section of Geography, Arctic and Antarctic Research Institute (AARI), 38 Bering Street, St. Petersburg 199392, Russian Federation;Institute of Geology, Karelian Branch of Russian Academy of Sciences, Pushkinskaya 11, 125610 Petrozavodsk, Russian Federation;Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, U.K.;Oil and Gas Research Institute, Exporta Street 5, LV 1226 Riga, Latvia;Department of Quaternary Geology, Lund University, SÖlvegatan 13, SE-22362 Lund, Sweden;Alfred-Wegener-Institut fÜr Polar and Meeresforschung (AWI), Postfach 600149, 14401 Potsdam, Germany;Geological Survey of Norway, P.O. Box 3006, Lade, N-7002 Trondheim, Norway;Department of Geology, University of Bergen, Allégt. 41, N-5007 Bergen, Norway;Geological Survey of Finland, Betonimiehenkuja 4, P.O. Box 96, Espoo, Fi-02151, Uusimaa, Finland |
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| Abstract: | Based on field investigations in northern Russia and interpretation of offshore seismic data, we have made a preliminary reconstruction of the maximum ice-sheet extent in the Barents and Kara Sea region during the Early/Middle Weichselian and the Late Weichselian. Our investigations indicate that the Barents and Kara ice sheets attained their maximum Weichselian positions in northern Russia prior to 50 000 yr BP, whereas the northeastern flank of the Scandinavian Ice Sheet advanced to a maximum position shortly after 17 000 calendar years ago. During the Late Weichselian (25 000-10 000 yr BP), much of the Russian Arctic remained ice-free. According to our reconstruction, the extent of the ice sheets in the Barents and Kara Sea region during the Late Weichselian glacial maximum was less than half that of the maximum model which, up to now, has been widely used as a boundary condition for testing and refining General Circulation Models (GCMs). Preliminary numerical-modelling experiments predict Late Weichselian ice sheets which are larger than the ice extent implied for the Kara Sea region from dated geological evidence, suggesting very low precipitation. |
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