Repeated Pleistocene glaciation of the East Siberian continental margin.

Niessen, F., Hong, J. K., Hegewald, A., Matthiessen, J., Stein, R., Kim, H., Kim, S., Jensen, L., Jokat, W., Nam, S. I. and Kang, S. H. (2013) Repeated Pleistocene glaciation of the East Siberian continental margin. Nature Geoscience, 6 (10). pp. 842-846. DOI 10.1038/ngeo1904.

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Abstract

During the Pleistocene glaciations, Arctic ice sheets on western Eurasia, Greenland and North America terminated at their continental margins. In contrast, the exposed continental shelves in the Beringian region of Siberia are thought to have been covered by a tundra landscape. Evidence of grounded ice on seafloor ridges and plateaux off the coast of the Beringian margin, at depths of up to 1,000 m, have generally been attributed to ice shelves or giant icebergs that spread oceanwards during glacial maxima. Here we identify marine glaciogenic landforms visible in seismic profiles and detailed bathymetric maps along the East Siberian continental margin. We interpret these features, which occur in present water depths of up to 1,200 m, as traces from grounding events of ice sheets and ice shelves. We conclude that the Siberian Shelf edge and parts of the Arctic Ocean were covered by ice sheets of about 1 km in thickness during several Pleistocene glaciations before the most recent glacial period, which must have had a significant influence on albedo and oceanic and atmospheric circulation.

Document Type: Article
Keywords: Repeated; Pleistocene; glaciation; East Siberian; continental; margin
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1038/ngeo1904
ISSN: 1752-0894
Projects: Transdrift, Laptev Sea System
Date Deposited: 27 Aug 2014 13:00
Last Modified: 03 Aug 2015 11:22
URI: http://oceanrep.geomar.de/id/eprint/25404

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