Laurentide Ice Sheet persistence during Pleistocene interglacials
While there are no ice sheets in the Northern Hemisphere outside of Greenland today, it is uncertain whether this was also the case during most other Quaternary interglacials. We show, using in situ cosmogenic nuclides in ice-rafted debris, that the Laurentide Ice Sheet was likely more persistent du...
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ftosti:oai:osti.gov:1963561 2023-07-30T04:03:51+02:00 Laurentide Ice Sheet persistence during Pleistocene interglacials LeBlanc, Danielle E. Shakun, Jeremy D. Corbett, Lee B. Bierman, Paul R. Caffee, Marc W. Hidy, Alan J. 2023-03-31 application/pdf http://www.osti.gov/servlets/purl/1963561 https://www.osti.gov/biblio/1963561 https://doi.org/10.1130/g50820.1 unknown http://www.osti.gov/servlets/purl/1963561 https://www.osti.gov/biblio/1963561 https://doi.org/10.1130/g50820.1 doi:10.1130/g50820.1 58 GEOSCIENCES 2023 ftosti https://doi.org/10.1130/g50820.1 2023-07-11T10:25:34Z While there are no ice sheets in the Northern Hemisphere outside of Greenland today, it is uncertain whether this was also the case during most other Quaternary interglacials. We show, using in situ cosmogenic nuclides in ice-rafted debris, that the Laurentide Ice Sheet was likely more persistent during Quaternary interglacials than often thought. Low 26 Al/ 10 Be ratios (indicative of burial of the source area) in marine core sediment suggest sediment source areas experienced only brief (on the order of thousands of years) and/or infrequent ice-free interglacials over the past million years. Here these results imply that complete Laurentide deglaciation may have only occurred when climate forcings reached levels comparable to those of the early Holocene, making our current interglacial unusual relative to others of the mid-to-late Pleistocene. Other/Unknown Material Greenland Ice Sheet SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Greenland Geology 51 5 496 499 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
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58 GEOSCIENCES |
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58 GEOSCIENCES LeBlanc, Danielle E. Shakun, Jeremy D. Corbett, Lee B. Bierman, Paul R. Caffee, Marc W. Hidy, Alan J. Laurentide Ice Sheet persistence during Pleistocene interglacials |
topic_facet |
58 GEOSCIENCES |
description |
While there are no ice sheets in the Northern Hemisphere outside of Greenland today, it is uncertain whether this was also the case during most other Quaternary interglacials. We show, using in situ cosmogenic nuclides in ice-rafted debris, that the Laurentide Ice Sheet was likely more persistent during Quaternary interglacials than often thought. Low 26 Al/ 10 Be ratios (indicative of burial of the source area) in marine core sediment suggest sediment source areas experienced only brief (on the order of thousands of years) and/or infrequent ice-free interglacials over the past million years. Here these results imply that complete Laurentide deglaciation may have only occurred when climate forcings reached levels comparable to those of the early Holocene, making our current interglacial unusual relative to others of the mid-to-late Pleistocene. |
author |
LeBlanc, Danielle E. Shakun, Jeremy D. Corbett, Lee B. Bierman, Paul R. Caffee, Marc W. Hidy, Alan J. |
author_facet |
LeBlanc, Danielle E. Shakun, Jeremy D. Corbett, Lee B. Bierman, Paul R. Caffee, Marc W. Hidy, Alan J. |
author_sort |
LeBlanc, Danielle E. |
title |
Laurentide Ice Sheet persistence during Pleistocene interglacials |
title_short |
Laurentide Ice Sheet persistence during Pleistocene interglacials |
title_full |
Laurentide Ice Sheet persistence during Pleistocene interglacials |
title_fullStr |
Laurentide Ice Sheet persistence during Pleistocene interglacials |
title_full_unstemmed |
Laurentide Ice Sheet persistence during Pleistocene interglacials |
title_sort |
laurentide ice sheet persistence during pleistocene interglacials |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1963561 https://www.osti.gov/biblio/1963561 https://doi.org/10.1130/g50820.1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
http://www.osti.gov/servlets/purl/1963561 https://www.osti.gov/biblio/1963561 https://doi.org/10.1130/g50820.1 doi:10.1130/g50820.1 |
op_doi |
https://doi.org/10.1130/g50820.1 |
container_title |
Geology |
container_volume |
51 |
container_issue |
5 |
container_start_page |
496 |
op_container_end_page |
499 |
_version_ |
1772814969422741504 |