Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland
Reliable projections of future sea level rise from the polar ice sheets depend on the ability of ice sheet models to accurately reproduce flow dynamics in an evolving ice sheet system. Ice sheet models are sensitive to the choice of basal sliding law, which remains a significant source of uncertaint...
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00073710 2024-06-23T07:53:16+00:00 Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland Trevers, Matt Payne, Antony J. Cornford, Stephen L. 2024-05 electronic https://doi.org/10.5194/egusphere-2024-1040 https://noa.gwlb.de/receive/cop_mods_00073710 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071858/egusphere-2024-1040.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1040/egusphere-2024-1040.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2024-1040 https://noa.gwlb.de/receive/cop_mods_00073710 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071858/egusphere-2024-1040.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1040/egusphere-2024-1040.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/egusphere-2024-1040 2024-05-27T23:38:26Z Reliable projections of future sea level rise from the polar ice sheets depend on the ability of ice sheet models to accurately reproduce flow dynamics in an evolving ice sheet system. Ice sheet models are sensitive to the choice of basal sliding law, which remains a significant source of uncertainty. In this study we apply a range sliding laws to a hindcast model of Jakobshavn Isbræ, West Greenland from 2009 to 2018. We show that commonly used Weertman-like sliding laws can not reproduce the large seasonal and inter-annual variations in flow speed, while the assimilation of regular velocity observations into the model improves the model accuracy. We demonstrate that a regularised Coulomb friction law, in which basal traction has an upper limit, was able to reproduce the peak flow speeds most accurately. Finally we find evidence that the speed at which sliding transitions between power-law and Coulomb regimes may vary spatially and temporally. These results point towards the possible form of an ideal sliding law for accurately modelling fast-flowing glaciers and ice streams. Article in Journal/Newspaper Greenland Ice Sheet Jakobshavn Jakobshavn isbræ Niedersächsisches Online-Archiv NOA Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) Weertman ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Trevers, Matt Payne, Antony J. Cornford, Stephen L. Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland |
topic_facet |
article Verlagsveröffentlichung |
description |
Reliable projections of future sea level rise from the polar ice sheets depend on the ability of ice sheet models to accurately reproduce flow dynamics in an evolving ice sheet system. Ice sheet models are sensitive to the choice of basal sliding law, which remains a significant source of uncertainty. In this study we apply a range sliding laws to a hindcast model of Jakobshavn Isbræ, West Greenland from 2009 to 2018. We show that commonly used Weertman-like sliding laws can not reproduce the large seasonal and inter-annual variations in flow speed, while the assimilation of regular velocity observations into the model improves the model accuracy. We demonstrate that a regularised Coulomb friction law, in which basal traction has an upper limit, was able to reproduce the peak flow speeds most accurately. Finally we find evidence that the speed at which sliding transitions between power-law and Coulomb regimes may vary spatially and temporally. These results point towards the possible form of an ideal sliding law for accurately modelling fast-flowing glaciers and ice streams. |
format |
Article in Journal/Newspaper |
author |
Trevers, Matt Payne, Antony J. Cornford, Stephen L. |
author_facet |
Trevers, Matt Payne, Antony J. Cornford, Stephen L. |
author_sort |
Trevers, Matt |
title |
Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland |
title_short |
Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland |
title_full |
Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland |
title_fullStr |
Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland |
title_full_unstemmed |
Application of a regularised Coulomb sliding law to Jakobshavn Isbræ, West Greenland |
title_sort |
application of a regularised coulomb sliding law to jakobshavn isbræ, west greenland |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-1040 https://noa.gwlb.de/receive/cop_mods_00073710 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071858/egusphere-2024-1040.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1040/egusphere-2024-1040.pdf |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
geographic |
Greenland Jakobshavn Isbræ Weertman |
geographic_facet |
Greenland Jakobshavn Isbræ Weertman |
genre |
Greenland Ice Sheet Jakobshavn Jakobshavn isbræ |
genre_facet |
Greenland Ice Sheet Jakobshavn Jakobshavn isbræ |
op_relation |
https://doi.org/10.5194/egusphere-2024-1040 https://noa.gwlb.de/receive/cop_mods_00073710 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071858/egusphere-2024-1040.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1040/egusphere-2024-1040.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2024-1040 |
_version_ |
1802644850522193920 |