A slip law for hard-bedded glaciers derived from observed bed topography
Ice-sheet responses to climate warming and associated sea-level rise depend sensitively on the form of the slip law that relates drag at the beds of glaciers to their slip velocity and basal water pressure. Process-based models of glacier slip over idealized, hard (rigid) beds with water-filled cavi...
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ftpubmed:oai:pubmedcentral.nih.gov:8121427 2023-05-15T16:40:24+02:00 A slip law for hard-bedded glaciers derived from observed bed topography Helanow, Christian Iverson, Neal R. Woodard, Jacob B. Zoet, Lucas K. 2021-05-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8121427/ http://www.ncbi.nlm.nih.gov/pubmed/33990323 https://doi.org/10.1126/sciadv.abe7798 en eng American Association for the Advancement of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8121427/ http://www.ncbi.nlm.nih.gov/pubmed/33990323 http://dx.doi.org/10.1126/sciadv.abe7798 Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Sci Adv Research Articles Text 2021 ftpubmed https://doi.org/10.1126/sciadv.abe7798 2021-05-23T00:33:29Z Ice-sheet responses to climate warming and associated sea-level rise depend sensitively on the form of the slip law that relates drag at the beds of glaciers to their slip velocity and basal water pressure. Process-based models of glacier slip over idealized, hard (rigid) beds with water-filled cavities yield slip laws in which drag decreases with increasing slip velocity or water pressure (rate-weakening drag). We present results of a process-based, three-dimensional model of glacier slip applied to measured bed topographies. We find that consideration of actual glacier beds eliminates or makes insignificant rate-weakening drag, thereby uniting process-based models of slip with some ice-sheet model parameterizations. Computed slip laws have the same form as those indicated by experiments with ice dragged over deformable till, the other common bed condition. Thus, these results may point to a universal slip law that would simplify and improve estimations of glacier discharges to the oceans. Text Ice Sheet PubMed Central (PMC) Science Advances 7 20 eabe7798 |
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Research Articles Helanow, Christian Iverson, Neal R. Woodard, Jacob B. Zoet, Lucas K. A slip law for hard-bedded glaciers derived from observed bed topography |
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Research Articles |
description |
Ice-sheet responses to climate warming and associated sea-level rise depend sensitively on the form of the slip law that relates drag at the beds of glaciers to their slip velocity and basal water pressure. Process-based models of glacier slip over idealized, hard (rigid) beds with water-filled cavities yield slip laws in which drag decreases with increasing slip velocity or water pressure (rate-weakening drag). We present results of a process-based, three-dimensional model of glacier slip applied to measured bed topographies. We find that consideration of actual glacier beds eliminates or makes insignificant rate-weakening drag, thereby uniting process-based models of slip with some ice-sheet model parameterizations. Computed slip laws have the same form as those indicated by experiments with ice dragged over deformable till, the other common bed condition. Thus, these results may point to a universal slip law that would simplify and improve estimations of glacier discharges to the oceans. |
format |
Text |
author |
Helanow, Christian Iverson, Neal R. Woodard, Jacob B. Zoet, Lucas K. |
author_facet |
Helanow, Christian Iverson, Neal R. Woodard, Jacob B. Zoet, Lucas K. |
author_sort |
Helanow, Christian |
title |
A slip law for hard-bedded glaciers derived from observed bed topography |
title_short |
A slip law for hard-bedded glaciers derived from observed bed topography |
title_full |
A slip law for hard-bedded glaciers derived from observed bed topography |
title_fullStr |
A slip law for hard-bedded glaciers derived from observed bed topography |
title_full_unstemmed |
A slip law for hard-bedded glaciers derived from observed bed topography |
title_sort |
slip law for hard-bedded glaciers derived from observed bed topography |
publisher |
American Association for the Advancement of Science |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8121427/ http://www.ncbi.nlm.nih.gov/pubmed/33990323 https://doi.org/10.1126/sciadv.abe7798 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Sci Adv |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8121427/ http://www.ncbi.nlm.nih.gov/pubmed/33990323 http://dx.doi.org/10.1126/sciadv.abe7798 |
op_rights |
Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
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CC-BY |
op_doi |
https://doi.org/10.1126/sciadv.abe7798 |
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Science Advances |
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7 |
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20 |
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