Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set
The dynamics of the Greenland Ice Sheet are affected by surface meltwater reaching the base of the ice, altering ice contact with the bedrock. Lack of understanding of this evolution hampers the ability to predict the effects of increasing temperatures on the Greenland Ice Sheet mass balance. Here w...
Published in: | Journal of Glaciology |
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2023
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Online Access: | https://orbit.dtu.dk/en/publications/24181556-da09-466b-a117-56d501302126 https://doi.org/10.1017/jog.2022.124 https://backend.orbit.dtu.dk/ws/files/336755188/outlet-glacier-flow-response-to-surface-melt-based-on-analysis-of-a-high-resolution-satellite-data-set_1_.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/24181556-da09-466b-a117-56d501302126 2024-09-15T18:07:40+00:00 Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set Larsen, Signe H. Ahlstrøm, Andreas P. Karlsson, Nanna B. Kusk, Anders Langen, Peter L. Hvidberg, Christine S. 2023 application/pdf https://orbit.dtu.dk/en/publications/24181556-da09-466b-a117-56d501302126 https://doi.org/10.1017/jog.2022.124 https://backend.orbit.dtu.dk/ws/files/336755188/outlet-glacier-flow-response-to-surface-melt-based-on-analysis-of-a-high-resolution-satellite-data-set_1_.pdf eng eng https://orbit.dtu.dk/en/publications/24181556-da09-466b-a117-56d501302126 info:eu-repo/semantics/openAccess Larsen , S H , Ahlstrøm , A P , Karlsson , N B , Kusk , A , Langen , P L & Hvidberg , C S 2023 , ' Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set ' , Journal of Glaciology , vol. 69 , no. 276 , pp. 1047–1055 . https://doi.org/10.1017/jog.2022.124 Ice dynamics Ice streams Subglacial processes article 2023 ftdtupubl https://doi.org/10.1017/jog.2022.124 2024-08-13T00:03:06Z The dynamics of the Greenland Ice Sheet are affected by surface meltwater reaching the base of the ice, altering ice contact with the bedrock. Lack of understanding of this evolution hampers the ability to predict the effects of increasing temperatures on the Greenland Ice Sheet mass balance. Here we present a unique high-resolution study of ice velocity response to surface melting based on data from a COSMO-SkyMed satellite campaign over Upernavik Isstrøm (Northwest Greenland) for two months around the end of the 2014 melt season. We show that the velocity variations, due to both short-term (days) and seasonal variations in surface melt rates, are increasing in relative strength farther from the glacier terminus. Furthermore, we observe how ice dynamic response to frontal retreat, reaching several kilometres inland, can obscure the meltwater-induced velocity change close to the terminus. Future studies should consider the flow velocity dependence on the distance to the terminus, and local geometry, to distinguish subglacial hydrologic system changes from frontal processes and local basal conditions. Article in Journal/Newspaper glacier Greenland Ice Sheet Journal of Glaciology Upernavik Technical University of Denmark: DTU Orbit Journal of Glaciology 69 276 1047 1055 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Ice dynamics Ice streams Subglacial processes |
spellingShingle |
Ice dynamics Ice streams Subglacial processes Larsen, Signe H. Ahlstrøm, Andreas P. Karlsson, Nanna B. Kusk, Anders Langen, Peter L. Hvidberg, Christine S. Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set |
topic_facet |
Ice dynamics Ice streams Subglacial processes |
description |
The dynamics of the Greenland Ice Sheet are affected by surface meltwater reaching the base of the ice, altering ice contact with the bedrock. Lack of understanding of this evolution hampers the ability to predict the effects of increasing temperatures on the Greenland Ice Sheet mass balance. Here we present a unique high-resolution study of ice velocity response to surface melting based on data from a COSMO-SkyMed satellite campaign over Upernavik Isstrøm (Northwest Greenland) for two months around the end of the 2014 melt season. We show that the velocity variations, due to both short-term (days) and seasonal variations in surface melt rates, are increasing in relative strength farther from the glacier terminus. Furthermore, we observe how ice dynamic response to frontal retreat, reaching several kilometres inland, can obscure the meltwater-induced velocity change close to the terminus. Future studies should consider the flow velocity dependence on the distance to the terminus, and local geometry, to distinguish subglacial hydrologic system changes from frontal processes and local basal conditions. |
format |
Article in Journal/Newspaper |
author |
Larsen, Signe H. Ahlstrøm, Andreas P. Karlsson, Nanna B. Kusk, Anders Langen, Peter L. Hvidberg, Christine S. |
author_facet |
Larsen, Signe H. Ahlstrøm, Andreas P. Karlsson, Nanna B. Kusk, Anders Langen, Peter L. Hvidberg, Christine S. |
author_sort |
Larsen, Signe H. |
title |
Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set |
title_short |
Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set |
title_full |
Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set |
title_fullStr |
Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set |
title_full_unstemmed |
Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set |
title_sort |
outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set |
publishDate |
2023 |
url |
https://orbit.dtu.dk/en/publications/24181556-da09-466b-a117-56d501302126 https://doi.org/10.1017/jog.2022.124 https://backend.orbit.dtu.dk/ws/files/336755188/outlet-glacier-flow-response-to-surface-melt-based-on-analysis-of-a-high-resolution-satellite-data-set_1_.pdf |
genre |
glacier Greenland Ice Sheet Journal of Glaciology Upernavik |
genre_facet |
glacier Greenland Ice Sheet Journal of Glaciology Upernavik |
op_source |
Larsen , S H , Ahlstrøm , A P , Karlsson , N B , Kusk , A , Langen , P L & Hvidberg , C S 2023 , ' Outlet glacier flow response to surface melt: based on analysis of a high-resolution satellite data set ' , Journal of Glaciology , vol. 69 , no. 276 , pp. 1047–1055 . https://doi.org/10.1017/jog.2022.124 |
op_relation |
https://orbit.dtu.dk/en/publications/24181556-da09-466b-a117-56d501302126 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2022.124 |
container_title |
Journal of Glaciology |
container_volume |
69 |
container_issue |
276 |
container_start_page |
1047 |
op_container_end_page |
1055 |
_version_ |
1810445046242082816 |