Accelerating ice flow at the onset of the Northeast Greenland Ice Stream
A new study finds that the North East Greenland ice stream is not as stable as previously thought and that this will affect its future evolution. Mass loss near the ice-sheet margin is evident from remote sensing as frontal retreat and increases in ice velocities. Velocities in the ice sheet interio...
Published in: | Nature Communications |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/accelerating-ice-flow-at-the-onset-of-the-northeast-greenland-ice-stream(8799d5d2-4d5d-4685-9081-a5662c641b81).html https://doi.org/10.1038/s41467-022-32999-2 https://curis.ku.dk/ws/files/321268346/s41467_022_32999_2.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/8799d5d2-4d5d-4685-9081-a5662c641b81 2024-06-09T07:45:39+00:00 Accelerating ice flow at the onset of the Northeast Greenland Ice Stream Grinsted, Aslak Hvidberg, Christine S. Lilien, David A. Rathmann, Nicholas M. Karlsson, Nanna B. Gerber, Tamara Kjaer, Helle Astrid Vallelonga, Paul Dahl-Jensen, Dorthe 2022-09-23 application/pdf https://curis.ku.dk/portal/da/publications/accelerating-ice-flow-at-the-onset-of-the-northeast-greenland-ice-stream(8799d5d2-4d5d-4685-9081-a5662c641b81).html https://doi.org/10.1038/s41467-022-32999-2 https://curis.ku.dk/ws/files/321268346/s41467_022_32999_2.pdf eng eng info:eu-repo/semantics/openAccess Grinsted , A , Hvidberg , C S , Lilien , D A , Rathmann , N M , Karlsson , N B , Gerber , T , Kjaer , H A , Vallelonga , P & Dahl-Jensen , D 2022 , ' Accelerating ice flow at the onset of the Northeast Greenland Ice Stream ' , Nature Communications , vol. 13 , no. 1 , 5589 . https://doi.org/10.1038/s41467-022-32999-2 article 2022 ftcopenhagenunip https://doi.org/10.1038/s41467-022-32999-2 2024-05-16T11:29:25Z A new study finds that the North East Greenland ice stream is not as stable as previously thought and that this will affect its future evolution. Mass loss near the ice-sheet margin is evident from remote sensing as frontal retreat and increases in ice velocities. Velocities in the ice sheet interior are orders of magnitude smaller, making it challenging to detect velocity change. Here, we analyze a 35-year record of remotely sensed velocities, and a 6-year record of repeated GPS observations, at the East Greenland Ice-core Project (EastGRIP), located in the middle of the Northeast-Greenland Ice Stream (NEGIS). We find that the shear margins of NEGIS are accelerating, indicating a widening of the ice stream. We demonstrate that the widening of the ice stream is unlikely to be a response to recent changes at the outlets of NEGIS. Modelling indicates that the observed spatial fingerprint of acceleration is more consistent with a softening of the shear margin, e.g. due to evolving fabric or temperature, than a response to external forcing at the surface or bed. Article in Journal/Newspaper East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet University of Copenhagen: Research Greenland Nature Communications 13 1 |
institution |
Open Polar |
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University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
A new study finds that the North East Greenland ice stream is not as stable as previously thought and that this will affect its future evolution. Mass loss near the ice-sheet margin is evident from remote sensing as frontal retreat and increases in ice velocities. Velocities in the ice sheet interior are orders of magnitude smaller, making it challenging to detect velocity change. Here, we analyze a 35-year record of remotely sensed velocities, and a 6-year record of repeated GPS observations, at the East Greenland Ice-core Project (EastGRIP), located in the middle of the Northeast-Greenland Ice Stream (NEGIS). We find that the shear margins of NEGIS are accelerating, indicating a widening of the ice stream. We demonstrate that the widening of the ice stream is unlikely to be a response to recent changes at the outlets of NEGIS. Modelling indicates that the observed spatial fingerprint of acceleration is more consistent with a softening of the shear margin, e.g. due to evolving fabric or temperature, than a response to external forcing at the surface or bed. |
format |
Article in Journal/Newspaper |
author |
Grinsted, Aslak Hvidberg, Christine S. Lilien, David A. Rathmann, Nicholas M. Karlsson, Nanna B. Gerber, Tamara Kjaer, Helle Astrid Vallelonga, Paul Dahl-Jensen, Dorthe |
spellingShingle |
Grinsted, Aslak Hvidberg, Christine S. Lilien, David A. Rathmann, Nicholas M. Karlsson, Nanna B. Gerber, Tamara Kjaer, Helle Astrid Vallelonga, Paul Dahl-Jensen, Dorthe Accelerating ice flow at the onset of the Northeast Greenland Ice Stream |
author_facet |
Grinsted, Aslak Hvidberg, Christine S. Lilien, David A. Rathmann, Nicholas M. Karlsson, Nanna B. Gerber, Tamara Kjaer, Helle Astrid Vallelonga, Paul Dahl-Jensen, Dorthe |
author_sort |
Grinsted, Aslak |
title |
Accelerating ice flow at the onset of the Northeast Greenland Ice Stream |
title_short |
Accelerating ice flow at the onset of the Northeast Greenland Ice Stream |
title_full |
Accelerating ice flow at the onset of the Northeast Greenland Ice Stream |
title_fullStr |
Accelerating ice flow at the onset of the Northeast Greenland Ice Stream |
title_full_unstemmed |
Accelerating ice flow at the onset of the Northeast Greenland Ice Stream |
title_sort |
accelerating ice flow at the onset of the northeast greenland ice stream |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/accelerating-ice-flow-at-the-onset-of-the-northeast-greenland-ice-stream(8799d5d2-4d5d-4685-9081-a5662c641b81).html https://doi.org/10.1038/s41467-022-32999-2 https://curis.ku.dk/ws/files/321268346/s41467_022_32999_2.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
genre_facet |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
op_source |
Grinsted , A , Hvidberg , C S , Lilien , D A , Rathmann , N M , Karlsson , N B , Gerber , T , Kjaer , H A , Vallelonga , P & Dahl-Jensen , D 2022 , ' Accelerating ice flow at the onset of the Northeast Greenland Ice Stream ' , Nature Communications , vol. 13 , no. 1 , 5589 . https://doi.org/10.1038/s41467-022-32999-2 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41467-022-32999-2 |
container_title |
Nature Communications |
container_volume |
13 |
container_issue |
1 |
_version_ |
1801375121518100480 |