Deeply incised submarine glacial valleys beneath the Greenland ice sheet
The bed topography beneath the Greenland ice sheet controls the flow of ice and its discharge into the ocean. Outlet glaciers move through a set of narrow valleys whose detailed geometry is poorly known, especially along the southern coasts1-3. As a result, the contribution of the Greenland ice shee...
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2014
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Online Access: | https://escholarship.org/uc/item/0ns9c9z6 https://escholarship.org/content/qt0ns9c9z6/qt0ns9c9z6.pdf https://doi.org/10.1038/ngeo2167 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt0ns9c9z6 2024-09-15T18:08:28+00:00 Deeply incised submarine glacial valleys beneath the Greenland ice sheet Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E 418 - 422 2014-06-01 application/pdf https://escholarship.org/uc/item/0ns9c9z6 https://escholarship.org/content/qt0ns9c9z6/qt0ns9c9z6.pdf https://doi.org/10.1038/ngeo2167 unknown eScholarship, University of California qt0ns9c9z6 https://escholarship.org/uc/item/0ns9c9z6 https://escholarship.org/content/qt0ns9c9z6/qt0ns9c9z6.pdf doi:10.1038/ngeo2167 CC-BY Nature Geoscience, vol 7, iss 6 Meteorology & Atmospheric Sciences article 2014 ftcdlib https://doi.org/10.1038/ngeo2167 2024-06-28T06:28:20Z The bed topography beneath the Greenland ice sheet controls the flow of ice and its discharge into the ocean. Outlet glaciers move through a set of narrow valleys whose detailed geometry is poorly known, especially along the southern coasts1-3. As a result, the contribution of the Greenland ice sheet and its glaciers to sea-level change in the coming century is uncertain. Here, we combine sparse ice-thickness data derived from airborne radar soundings with satellite-derived high-resolution ice motion data through a mass conservation optimization scheme5. We infer ice thickness and bed topography along the entire periphery of the Greenland ice sheet at an unprecedented level of spatial detail and precision. We detect widespread ice-covered valleys that extend significantly deeper below sea level and farther inland than previously thought. Our findings imply that the outlet glaciers of Greenland, and the ice sheet as a whole, are probably more vulnerable to ocean thermal forcing and peripheral thinning than inferred previously from existing numerical ice-sheet models. © 2014 Macmillan Publishers Limited. Article in Journal/Newspaper Greenland Ice Sheet University of California: eScholarship Nature Geoscience 7 6 418 422 |
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Open Polar |
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University of California: eScholarship |
op_collection_id |
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language |
unknown |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E Deeply incised submarine glacial valleys beneath the Greenland ice sheet |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
The bed topography beneath the Greenland ice sheet controls the flow of ice and its discharge into the ocean. Outlet glaciers move through a set of narrow valleys whose detailed geometry is poorly known, especially along the southern coasts1-3. As a result, the contribution of the Greenland ice sheet and its glaciers to sea-level change in the coming century is uncertain. Here, we combine sparse ice-thickness data derived from airborne radar soundings with satellite-derived high-resolution ice motion data through a mass conservation optimization scheme5. We infer ice thickness and bed topography along the entire periphery of the Greenland ice sheet at an unprecedented level of spatial detail and precision. We detect widespread ice-covered valleys that extend significantly deeper below sea level and farther inland than previously thought. Our findings imply that the outlet glaciers of Greenland, and the ice sheet as a whole, are probably more vulnerable to ocean thermal forcing and peripheral thinning than inferred previously from existing numerical ice-sheet models. © 2014 Macmillan Publishers Limited. |
format |
Article in Journal/Newspaper |
author |
Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E |
author_facet |
Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E |
author_sort |
Morlighem, M |
title |
Deeply incised submarine glacial valleys beneath the Greenland ice sheet |
title_short |
Deeply incised submarine glacial valleys beneath the Greenland ice sheet |
title_full |
Deeply incised submarine glacial valleys beneath the Greenland ice sheet |
title_fullStr |
Deeply incised submarine glacial valleys beneath the Greenland ice sheet |
title_full_unstemmed |
Deeply incised submarine glacial valleys beneath the Greenland ice sheet |
title_sort |
deeply incised submarine glacial valleys beneath the greenland ice sheet |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/0ns9c9z6 https://escholarship.org/content/qt0ns9c9z6/qt0ns9c9z6.pdf https://doi.org/10.1038/ngeo2167 |
op_coverage |
418 - 422 |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Nature Geoscience, vol 7, iss 6 |
op_relation |
qt0ns9c9z6 https://escholarship.org/uc/item/0ns9c9z6 https://escholarship.org/content/qt0ns9c9z6/qt0ns9c9z6.pdf doi:10.1038/ngeo2167 |
op_rights |
CC-BY |
op_doi |
https://doi.org/10.1038/ngeo2167 |
container_title |
Nature Geoscience |
container_volume |
7 |
container_issue |
6 |
container_start_page |
418 |
op_container_end_page |
422 |
_version_ |
1810445833956491264 |