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- W2397322010 abstract "Over many years there was a general acceptance that thick ice sheets of marineisotope stages 2, 4 and 6 were restricted largely to continental Eurasia, Greenlandand North America including the adjacent shelves of the Arctic Ocean. With thisBeringia was understood as an ice-free land bridge between the continents of Asiaand America during glacial times with low sea levels and exposed shelves. However,since about 15 years a growing number of evidence is found in water depth up tomore than 1000 m that grounding of ice has occurred in various places of the ArcticOcean since MIS 6 and/or before including the Beringian continental margin. Withthe decline in Arctic Ocean summer sea ice during the last decade it has beenpossible to hydro-acoustically survey areas so far sparsely investigated because ofoperational constrains. Glacial landforms were discovered on many continentalslopes as well as ridges and seamounts of the Arctic Ocean, which rise up to lessthan about 1000 m below present sea level. These landforms include moraines,drumlinized features, glacigenic debris flows, till wedges, mega-scale glaciallineations (MSGL), and iceberg plough marks. They suggest that thick ice hasoccurred not only on nearly all margins of the Arctic Ocean but also covered pelagicareas.In our studies we present submarine glacial landforms from the western and centralArctic Ocean, which are interpreted as a result of a complex pattern of Pleistoceneglaciations along the continental margin of the East Siberian Sea. This wasdiscovered during the cruises of RV Polarstern in 2008 and RV Araon in 2012.Orientations of these landforms suggest thick ice has flown north onto the deepArctic Ocean, thereby grounded on plateaus and seamounts of the Medeleev Ridge.In addition, during the recent RV Polarstern cruise in 2014, hydro-acoustic data ispresented from the Lomonosov Ridge (Siberian side to close to the North Pole),which support the hypothesis of widespread grounding of ice in the Arctic Oceanfrom different Eurasian sources. The data suggest that thick ice-shelves havedeveloped from continental ice sheets on a nearly circum-arctic scale. These iceshelves extended far north and covered large areas of the Arctic Ocean. It nowdepends on the stratigraphical analysis of existing and future sediment cores to findout whether or not these ice shelves have occurred contemporaneously and whenthe individual grounding events have occurred." @default.
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- W2397322010 date "2015-01-01" @default.
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- W2397322010 title "Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean?" @default.
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