Maximum extent of the Eurasian ice sheets in the Barents and Kara Sea region during the Weichselian

Abstract

March): Maximum extent of the Eurasian ice sheets in the Barents and Kara Sea region during the Weichselian. Boreas, Vol. 28, pp. 234-242. Oslo. ISSN 0300-9483.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 EarlylMiddle 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 50000 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 OOO yr BP), much of the Russian Arctic remained icefree. 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 (CCMs). 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.

Microsatellite data resolve phylogeographic patterns in European grayling, Thymallus thymallus, Salmonidae

“…Assuming a T. thymallus generation interval of 5 years, the result suggests that separation of the NW/C and NE populations exceeds 10 000 years. As the major ice sheets receded from northern Europe at approximately 10 000 ybp (Svendsen et al, 1999), the observation reinforces that northern Europe was colonized from at least two isolated Pleistocene refugia.…”

New perspectives on Beringian Quaternary paleogeography, stratigraphy, and glacial history

“…I maintain, however, that this does not necessarily imply the presence of an ice sheet across the Russian arctic shelf as large as that suggested by Karabanov et al (1998). Rather, the stratigraphy inland from the Laptev Sea and Kara Sea show that glacial ice limits at some time prior to 50 ka were more extensive than during the LGM but much less extensive than during the middle Quaternary (Svendsen et al, 1999). Combined with earlier work summarized by Miller and deVernal (1992), we now have nearly circumarctic evidence for rapid glacierization at the end of the Last Interglacial, presumably driven by a precipitous drop in insolation while oceanic temperatures remained warm and eustatic sea level remained relatively high.…”

A multiproxy approach to reconstruct the environmental changes along the Eurasian continental margin over the last 150 000 years

“…Ž . Mangerud et al 1999 andSvendsen et al 1999 , rejecting the so-called ''Pan-Arctic Glaciation of the northern Hemisphere'' model proposed by Denton Fig. 7 and no IRD input during Termination I in Ž .…”

“…Ž . selian MIS 4 proposed by Svendsen et al 1999 . Possible evidences for a grounded ice-sheet along the northern margin of Severnaya Semlya during MIS 4 are probably reflected in the shallow core Ž .…”