Instability of the Northeast Greenland Ice Stream over the last 45,000 years
The sensitivity of the Northeast Greenland Ice Stream (NEGIS) to prolonged warm periods is largely unknown and geological records documenting such long-term changes are needed to place current observations in perspective. Here we use cosmogenic surface exposure and radiocarbon ages to determine the...
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ftoregonstate:ir.library.oregonstate.edu:vx021m25r 2023-06-11T04:12:10+02:00 Instability of the Northeast Greenland Ice Stream over the last 45,000 years Larsen, Nicolaj K. Levy, Laura B. Carlson, Anders E. Buizert, Christo Olsen, Jesper Strunk, Astrid Bjork, Anders A. Skov, Daniel S. https://ir.library.oregonstate.edu/concern/articles/vx021m25r English [eng] eng https://ir.library.oregonstate.edu/concern/articles/vx021m25r Attribution 4.0 (CC BY 4.0) Article ftoregonstate 2023-05-07T16:57:18Z The sensitivity of the Northeast Greenland Ice Stream (NEGIS) to prolonged warm periods is largely unknown and geological records documenting such long-term changes are needed to place current observations in perspective. Here we use cosmogenic surface exposure and radiocarbon ages to determine the magnitude of NEGIS margin fluctuations over the last 45 kyr (thousand years). We find that the NEGIS experienced slow early Holocene ice-margin retreat of 30-40 m a(-1), likely as a result of the buttressing effect of sea-ice or shelf-ice. The NEGIS was similar to 20-70 km behind its present ice-extent similar to 41-26 ka and similar to 7.8-1.2 ka; both periods of high orbital precession index and/or summer temperatures within the projected warming for the end of this century. We show that the NEGIS was smaller than present for approximately half of the last similar to 45 kyr and is susceptible to subtle changes in climate, which has implications for future stability of this ice stream. Article in Journal/Newspaper Greenland Sea ice ScholarsArchive@OSU (Oregon State University) Greenland |
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Open Polar |
collection |
ScholarsArchive@OSU (Oregon State University) |
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ftoregonstate |
language |
English |
description |
The sensitivity of the Northeast Greenland Ice Stream (NEGIS) to prolonged warm periods is largely unknown and geological records documenting such long-term changes are needed to place current observations in perspective. Here we use cosmogenic surface exposure and radiocarbon ages to determine the magnitude of NEGIS margin fluctuations over the last 45 kyr (thousand years). We find that the NEGIS experienced slow early Holocene ice-margin retreat of 30-40 m a(-1), likely as a result of the buttressing effect of sea-ice or shelf-ice. The NEGIS was similar to 20-70 km behind its present ice-extent similar to 41-26 ka and similar to 7.8-1.2 ka; both periods of high orbital precession index and/or summer temperatures within the projected warming for the end of this century. We show that the NEGIS was smaller than present for approximately half of the last similar to 45 kyr and is susceptible to subtle changes in climate, which has implications for future stability of this ice stream. |
format |
Article in Journal/Newspaper |
author |
Larsen, Nicolaj K. Levy, Laura B. Carlson, Anders E. Buizert, Christo Olsen, Jesper Strunk, Astrid Bjork, Anders A. Skov, Daniel S. |
spellingShingle |
Larsen, Nicolaj K. Levy, Laura B. Carlson, Anders E. Buizert, Christo Olsen, Jesper Strunk, Astrid Bjork, Anders A. Skov, Daniel S. Instability of the Northeast Greenland Ice Stream over the last 45,000 years |
author_facet |
Larsen, Nicolaj K. Levy, Laura B. Carlson, Anders E. Buizert, Christo Olsen, Jesper Strunk, Astrid Bjork, Anders A. Skov, Daniel S. |
author_sort |
Larsen, Nicolaj K. |
title |
Instability of the Northeast Greenland Ice Stream over the last 45,000 years |
title_short |
Instability of the Northeast Greenland Ice Stream over the last 45,000 years |
title_full |
Instability of the Northeast Greenland Ice Stream over the last 45,000 years |
title_fullStr |
Instability of the Northeast Greenland Ice Stream over the last 45,000 years |
title_full_unstemmed |
Instability of the Northeast Greenland Ice Stream over the last 45,000 years |
title_sort |
instability of the northeast greenland ice stream over the last 45,000 years |
url |
https://ir.library.oregonstate.edu/concern/articles/vx021m25r |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Sea ice |
genre_facet |
Greenland Sea ice |
op_relation |
https://ir.library.oregonstate.edu/concern/articles/vx021m25r |
op_rights |
Attribution 4.0 (CC BY 4.0) |
_version_ |
1768387845453512704 |