Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean?
Over many years there was a general acceptance that thick ice sheets of marine isotope stages 2, 4 and 6 were restricted largely to continental Eurasia, Greenland and North America including the adjacent shelves of the Arctic Ocean. With this "Beringia" was understood as an ice-free land b...
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ftawi:oai:epic.awi.de:39656 2024-09-15T17:50:05+00:00 Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? Niessen, Frank Stein, Rüdiger Jensen, Laura Schreck, Michael Matthiessen, Jens Jokat, Wilfried Hong, Jong Kuk Nam, Seung-Ill 2015 https://epic.awi.de/id/eprint/39656/ https://hdl.handle.net/10013/epic.46800 unknown Niessen, F. orcid:0000-0001-6453-0594 , Stein, R. orcid:0000-0002-4453-9564 , Jensen, L. , Schreck, M. , Matthiessen, J. orcid:0000-0002-6952-2494 , Jokat, W. orcid:0000-0002-7793-5854 , Hong, J. K. and Nam, S. I. (2015) Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? , 7th International Conference on Arctic Margins, Trondheim, Norway, 2 June 2015 - 5 June 2015 . hdl:10013/epic.46800 EPIC37th International Conference on Arctic Margins, Trondheim, Norway, 2015-06-02-2015-06-05 Conference notRev 2015 ftawi 2024-06-24T04:13:16Z Over many years there was a general acceptance that thick ice sheets of marine isotope stages 2, 4 and 6 were restricted largely to continental Eurasia, Greenland and North America including the adjacent shelves of the Arctic Ocean. With this "Beringia" was understood as an ice-free land bridge between the continents of Asia and 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 to more than 1000 m that grounding of ice has occurred in various places of the Arctic Ocean since MIS 6 and/or before including the "Beringian" continental margin. With the decline in Arctic Ocean summer sea ice during the last decade it has been possible to hydro-acoustically survey areas so far sparsely investigated because of operational constrains. Glacial landforms were discovered on many continental slopes as well as ridges and seamounts of the Arctic Ocean, which rise up to less than about 1000 m below present sea level. These landforms include moraines, drumlinized features, glacigenic debris flows, till wedges, mega-scale glacial lineations (MSGL), and iceberg plough marks. They suggest that thick ice has occurred not only on nearly all margins of the Arctic Ocean but also covered pelagic areas. In our studies we present submarine glacial landforms from the western and central Arctic Ocean, which are interpreted as a result of a complex pattern of Pleistocene glaciations along the continental margin of the East Siberian Sea. This was discovered 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 deep Arctic Ocean, thereby grounded on plateaus and seamounts of the Medeleev Ridge. In addition, during the recent RV "Polarstern" cruise in 2014, hydro-acoustic data is presented from the Lomonosov Ridge (Siberian side to close to the North Pole), which support the hypothesis of widespread grounding of ice in the Arctic Ocean from different ... Conference Object Arctic Arctic Ocean East Siberian Sea Greenland Ice Shelves Iceberg* Lomonosov Ridge North Pole Sea ice Beringia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Over many years there was a general acceptance that thick ice sheets of marine isotope stages 2, 4 and 6 were restricted largely to continental Eurasia, Greenland and North America including the adjacent shelves of the Arctic Ocean. With this "Beringia" was understood as an ice-free land bridge between the continents of Asia and 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 to more than 1000 m that grounding of ice has occurred in various places of the Arctic Ocean since MIS 6 and/or before including the "Beringian" continental margin. With the decline in Arctic Ocean summer sea ice during the last decade it has been possible to hydro-acoustically survey areas so far sparsely investigated because of operational constrains. Glacial landforms were discovered on many continental slopes as well as ridges and seamounts of the Arctic Ocean, which rise up to less than about 1000 m below present sea level. These landforms include moraines, drumlinized features, glacigenic debris flows, till wedges, mega-scale glacial lineations (MSGL), and iceberg plough marks. They suggest that thick ice has occurred not only on nearly all margins of the Arctic Ocean but also covered pelagic areas. In our studies we present submarine glacial landforms from the western and central Arctic Ocean, which are interpreted as a result of a complex pattern of Pleistocene glaciations along the continental margin of the East Siberian Sea. This was discovered 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 deep Arctic Ocean, thereby grounded on plateaus and seamounts of the Medeleev Ridge. In addition, during the recent RV "Polarstern" cruise in 2014, hydro-acoustic data is presented from the Lomonosov Ridge (Siberian side to close to the North Pole), which support the hypothesis of widespread grounding of ice in the Arctic Ocean from different ... |
format |
Conference Object |
author |
Niessen, Frank Stein, Rüdiger Jensen, Laura Schreck, Michael Matthiessen, Jens Jokat, Wilfried Hong, Jong Kuk Nam, Seung-Ill |
spellingShingle |
Niessen, Frank Stein, Rüdiger Jensen, Laura Schreck, Michael Matthiessen, Jens Jokat, Wilfried Hong, Jong Kuk Nam, Seung-Ill Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? |
author_facet |
Niessen, Frank Stein, Rüdiger Jensen, Laura Schreck, Michael Matthiessen, Jens Jokat, Wilfried Hong, Jong Kuk Nam, Seung-Ill |
author_sort |
Niessen, Frank |
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? |
title_short |
Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? |
title_full |
Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? |
title_fullStr |
Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? |
title_full_unstemmed |
Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? |
title_sort |
pleistocene ice-grounding events along the east siberian margin and on the lomonosov ridge: implications for circum-arctic ice shelves in the arctic ocean? |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/39656/ https://hdl.handle.net/10013/epic.46800 |
genre |
Arctic Arctic Ocean East Siberian Sea Greenland Ice Shelves Iceberg* Lomonosov Ridge North Pole Sea ice Beringia |
genre_facet |
Arctic Arctic Ocean East Siberian Sea Greenland Ice Shelves Iceberg* Lomonosov Ridge North Pole Sea ice Beringia |
op_source |
EPIC37th International Conference on Arctic Margins, Trondheim, Norway, 2015-06-02-2015-06-05 |
op_relation |
Niessen, F. orcid:0000-0001-6453-0594 , Stein, R. orcid:0000-0002-4453-9564 , Jensen, L. , Schreck, M. , Matthiessen, J. orcid:0000-0002-6952-2494 , Jokat, W. orcid:0000-0002-7793-5854 , Hong, J. K. and Nam, S. I. (2015) Pleistocene ice-grounding events along the East Siberian margin and on the Lomonosov Ridge: Implications for circum-arctic ice shelves in the Arctic Ocean? , 7th International Conference on Arctic Margins, Trondheim, Norway, 2 June 2015 - 5 June 2015 . hdl:10013/epic.46800 |
_version_ |
1810291933252157440 |