Marine ice sheets of Pleistocene age on the East Siberian Continental Margin
Based on swath bathymetry, sediment echosounding, seismic profiling and sediment coring we present results of the RV „Polarstern“ cruise ARK-XIII/3 (2008) and RV "Araon" cruise ARA02B (2012), which investigated an area between the Chukchi Borderland and the East Siberian Sea between 165°W...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
American Geophysical Union
2013
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/34048/ https://epic.awi.de/id/eprint/34048/1/Niessen_et_al_AGU_Fall_Abstract_2013.pdf https://hdl.handle.net/10013/epic.46741 https://hdl.handle.net/10013/epic.46741.d001 |
id |
ftawi:oai:epic.awi.de:34048 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:34048 2024-09-15T17:35:58+00:00 Marine ice sheets of Pleistocene age on the East Siberian Continental Margin Niessen, Frank Hong, Jong Kuk Hegewald, Anne Matthiessen, Jens Stein, Rüdiger Kim, Hyoungjun Kim, Sookwan Jensen, Laura Jokat, Wilfried Nam, Seung-Ill Kang, Sung-Ho 2013-12 application/pdf https://epic.awi.de/id/eprint/34048/ https://epic.awi.de/id/eprint/34048/1/Niessen_et_al_AGU_Fall_Abstract_2013.pdf https://hdl.handle.net/10013/epic.46741 https://hdl.handle.net/10013/epic.46741.d001 unknown American Geophysical Union https://epic.awi.de/id/eprint/34048/1/Niessen_et_al_AGU_Fall_Abstract_2013.pdf https://hdl.handle.net/10013/epic.46741.d001 Niessen, F. orcid:0000-0001-6453-0594 , Hong, J. K. , Hegewald, A. , Matthiessen, J. orcid:0000-0002-6952-2494 , Stein, R. orcid:0000-0002-4453-9564 , Kim, H. , Kim, S. , Jensen, L. , Jokat, W. orcid:0000-0002-7793-5854 , Nam, S. I. and Kang, S. H. (2013) Marine ice sheets of Pleistocene age on the East Siberian Continental Margin , AGU Fall Meeting, 8 December 2013 - 13 December 2013 . hdl:10013/epic.46741 EPIC3AGU Fall Meeting, 2013-12-08-2013-12-13American Geophysical Union Conference notRev 2013 ftawi 2024-06-24T04:08:32Z Based on swath bathymetry, sediment echosounding, seismic profiling and sediment coring we present results of the RV „Polarstern“ cruise ARK-XIII/3 (2008) and RV "Araon" cruise ARA02B (2012), which investigated an area between the Chukchi Borderland and the East Siberian Sea between 165°W and 170°E. At the southern end of the Mendeleev Ridge, close to the Chukchi and East Siberian shelves, evidence is found for the existence of Pleistocene ice sheets/ice shelves, which have grounded several times in up to 1200 m present water depth. We found mega-scale glacial lineations associated with deposition of glaciogenic wedges and debris-flow deposits indicative of sub-glacial erosion and deposition close to the former grounding lines. Glacially lineated areas are associated with large-scale erosion, accentuated by a conspicuous truncation of pre-glacial strata typically capped with mostly thin layers of diamicton draped by pelagic sediments. Our tentative age model suggests that the youngest and shallowest grounding event of an ice sheet should be within Marine Isotope Stage (MIS) 3. The oldest and deepest event predates MIS 6. According to our results, ice sheets of more than one km in thickness continued onto, and likely centered over, the East Siberian Shelf. They were possibly linked to previously suggested ice sheets on the Chukchi Borderland and the New Siberian Islands. We propose that the ice sheets extended northward as thick ice shelves, which grounded on the Mendeleev Ridge to an area up to 78°N within MIS 5 and/or earlier. These results have important implication for the former distribution of thick ice masses in the Arctic Ocean during the Pleistocene. They are relevant for global sea-level variations, albedo, ocean-atmosphere heat exchange, freshwater export from the Arctic Ocean at glacial terminations and the formation of submarine permafrost. The existence of km-thick Pleistocene ice sheets in the western Arctic Ocean during glacial times predating that of the Last Glacial Maximum (LGM) also implies ... Conference Object albedo Arctic Ocean Chukchi East Siberian Sea Ice Ice Sheet Ice Shelves New Siberian Islands permafrost wedge* Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Based on swath bathymetry, sediment echosounding, seismic profiling and sediment coring we present results of the RV „Polarstern“ cruise ARK-XIII/3 (2008) and RV "Araon" cruise ARA02B (2012), which investigated an area between the Chukchi Borderland and the East Siberian Sea between 165°W and 170°E. At the southern end of the Mendeleev Ridge, close to the Chukchi and East Siberian shelves, evidence is found for the existence of Pleistocene ice sheets/ice shelves, which have grounded several times in up to 1200 m present water depth. We found mega-scale glacial lineations associated with deposition of glaciogenic wedges and debris-flow deposits indicative of sub-glacial erosion and deposition close to the former grounding lines. Glacially lineated areas are associated with large-scale erosion, accentuated by a conspicuous truncation of pre-glacial strata typically capped with mostly thin layers of diamicton draped by pelagic sediments. Our tentative age model suggests that the youngest and shallowest grounding event of an ice sheet should be within Marine Isotope Stage (MIS) 3. The oldest and deepest event predates MIS 6. According to our results, ice sheets of more than one km in thickness continued onto, and likely centered over, the East Siberian Shelf. They were possibly linked to previously suggested ice sheets on the Chukchi Borderland and the New Siberian Islands. We propose that the ice sheets extended northward as thick ice shelves, which grounded on the Mendeleev Ridge to an area up to 78°N within MIS 5 and/or earlier. These results have important implication for the former distribution of thick ice masses in the Arctic Ocean during the Pleistocene. They are relevant for global sea-level variations, albedo, ocean-atmosphere heat exchange, freshwater export from the Arctic Ocean at glacial terminations and the formation of submarine permafrost. The existence of km-thick Pleistocene ice sheets in the western Arctic Ocean during glacial times predating that of the Last Glacial Maximum (LGM) also implies ... |
format |
Conference Object |
author |
Niessen, Frank Hong, Jong Kuk Hegewald, Anne Matthiessen, Jens Stein, Rüdiger Kim, Hyoungjun Kim, Sookwan Jensen, Laura Jokat, Wilfried Nam, Seung-Ill Kang, Sung-Ho |
spellingShingle |
Niessen, Frank Hong, Jong Kuk Hegewald, Anne Matthiessen, Jens Stein, Rüdiger Kim, Hyoungjun Kim, Sookwan Jensen, Laura Jokat, Wilfried Nam, Seung-Ill Kang, Sung-Ho Marine ice sheets of Pleistocene age on the East Siberian Continental Margin |
author_facet |
Niessen, Frank Hong, Jong Kuk Hegewald, Anne Matthiessen, Jens Stein, Rüdiger Kim, Hyoungjun Kim, Sookwan Jensen, Laura Jokat, Wilfried Nam, Seung-Ill Kang, Sung-Ho |
author_sort |
Niessen, Frank |
title |
Marine ice sheets of Pleistocene age on the East Siberian Continental Margin |
title_short |
Marine ice sheets of Pleistocene age on the East Siberian Continental Margin |
title_full |
Marine ice sheets of Pleistocene age on the East Siberian Continental Margin |
title_fullStr |
Marine ice sheets of Pleistocene age on the East Siberian Continental Margin |
title_full_unstemmed |
Marine ice sheets of Pleistocene age on the East Siberian Continental Margin |
title_sort |
marine ice sheets of pleistocene age on the east siberian continental margin |
publisher |
American Geophysical Union |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/34048/ https://epic.awi.de/id/eprint/34048/1/Niessen_et_al_AGU_Fall_Abstract_2013.pdf https://hdl.handle.net/10013/epic.46741 https://hdl.handle.net/10013/epic.46741.d001 |
genre |
albedo Arctic Ocean Chukchi East Siberian Sea Ice Ice Sheet Ice Shelves New Siberian Islands permafrost wedge* |
genre_facet |
albedo Arctic Ocean Chukchi East Siberian Sea Ice Ice Sheet Ice Shelves New Siberian Islands permafrost wedge* |
op_source |
EPIC3AGU Fall Meeting, 2013-12-08-2013-12-13American Geophysical Union |
op_relation |
https://epic.awi.de/id/eprint/34048/1/Niessen_et_al_AGU_Fall_Abstract_2013.pdf https://hdl.handle.net/10013/epic.46741.d001 Niessen, F. orcid:0000-0001-6453-0594 , Hong, J. K. , Hegewald, A. , Matthiessen, J. orcid:0000-0002-6952-2494 , Stein, R. orcid:0000-0002-4453-9564 , Kim, H. , Kim, S. , Jensen, L. , Jokat, W. orcid:0000-0002-7793-5854 , Nam, S. I. and Kang, S. H. (2013) Marine ice sheets of Pleistocene age on the East Siberian Continental Margin , AGU Fall Meeting, 8 December 2013 - 13 December 2013 . hdl:10013/epic.46741 |
_version_ |
1810486391616831488 |