Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice.
Uncertainty associated with ice sheet motion plagues sea level rise predictions. Much of this uncertainty arises from imperfect representations of physical processes including basal slip and internal ice deformation, with ice sheet models largely incapable of reproducing borehole-based observations....
Published in: | Science Advances |
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2023
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Online Access: | https://serval.unil.ch/notice/serval:BIB_41A66AA5C6FE https://doi.org/10.1126/sciadv.abq5180 https://serval.unil.ch/resource/serval:BIB_41A66AA5C6FE.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_41A66AA5C6FE5 |
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ftunivlausanne:oai:serval.unil.ch:BIB_41A66AA5C6FE 2024-02-11T10:04:01+01:00 Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice. Law, R. Christoffersen, P. MacKie, E. Cook, S. Haseloff, M. Gagliardini, O. 2023-02-10 application/pdf https://serval.unil.ch/notice/serval:BIB_41A66AA5C6FE https://doi.org/10.1126/sciadv.abq5180 https://serval.unil.ch/resource/serval:BIB_41A66AA5C6FE.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_41A66AA5C6FE5 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1126/sciadv.abq5180 info:eu-repo/semantics/altIdentifier/pmid/36763651 info:eu-repo/semantics/altIdentifier/eissn/2375-2548 info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_41A66AA5C6FE5 https://serval.unil.ch/notice/serval:BIB_41A66AA5C6FE doi:10.1126/sciadv.abq5180 urn:issn:2375-2548 https://serval.unil.ch/resource/serval:BIB_41A66AA5C6FE.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_41A66AA5C6FE5 info:eu-repo/semantics/openAccess CC BY-NC 4.0 https://creativecommons.org/licenses/by-nc/4.0/ Science advances, vol. 9, no. 6, pp. eabq5180 info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion 2023 ftunivlausanne https://doi.org/10.1126/sciadv.abq5180 2024-01-22T01:12:00Z Uncertainty associated with ice sheet motion plagues sea level rise predictions. Much of this uncertainty arises from imperfect representations of physical processes including basal slip and internal ice deformation, with ice sheet models largely incapable of reproducing borehole-based observations. Here, we model isolated three-dimensional domains from fast-moving (Sermeq Kujalleq/Store Glacier) and slow-moving (Isunnguata Sermia) ice sheet settings in Greenland. By incorporating realistic geostatistically simulated topography, we show that a spatially highly variable layer of temperate ice (much softer ice at the pressure-melting point) forms naturally in both settings, alongside ice motion patterns which diverge substantially from those obtained using smoothly varying BedMachine topography. Temperate ice is vertically extensive (>100 meters) in deep troughs but thins notably (<5 meters) over bedrock highs, with basal slip rates reaching >90 or <5% of surface velocity dependent on topography and temperate layer thickness. Developing parameterizations of the net effect of this complex motion can improve the realism of predictive ice sheet models. Article in Journal/Newspaper glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq Université de Lausanne (UNIL): Serval - Serveur académique lausannois Greenland Isunnguata Sermia ENVELOPE(-50.167,-50.167,67.183,67.183) Kujalleq ENVELOPE(-46.037,-46.037,60.719,60.719) Science Advances 9 6 |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
description |
Uncertainty associated with ice sheet motion plagues sea level rise predictions. Much of this uncertainty arises from imperfect representations of physical processes including basal slip and internal ice deformation, with ice sheet models largely incapable of reproducing borehole-based observations. Here, we model isolated three-dimensional domains from fast-moving (Sermeq Kujalleq/Store Glacier) and slow-moving (Isunnguata Sermia) ice sheet settings in Greenland. By incorporating realistic geostatistically simulated topography, we show that a spatially highly variable layer of temperate ice (much softer ice at the pressure-melting point) forms naturally in both settings, alongside ice motion patterns which diverge substantially from those obtained using smoothly varying BedMachine topography. Temperate ice is vertically extensive (>100 meters) in deep troughs but thins notably (<5 meters) over bedrock highs, with basal slip rates reaching >90 or <5% of surface velocity dependent on topography and temperate layer thickness. Developing parameterizations of the net effect of this complex motion can improve the realism of predictive ice sheet models. |
format |
Article in Journal/Newspaper |
author |
Law, R. Christoffersen, P. MacKie, E. Cook, S. Haseloff, M. Gagliardini, O. |
spellingShingle |
Law, R. Christoffersen, P. MacKie, E. Cook, S. Haseloff, M. Gagliardini, O. Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice. |
author_facet |
Law, R. Christoffersen, P. MacKie, E. Cook, S. Haseloff, M. Gagliardini, O. |
author_sort |
Law, R. |
title |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice. |
title_short |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice. |
title_full |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice. |
title_fullStr |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice. |
title_full_unstemmed |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice. |
title_sort |
complex motion of greenland ice sheet outlet glaciers with basal temperate ice. |
publishDate |
2023 |
url |
https://serval.unil.ch/notice/serval:BIB_41A66AA5C6FE https://doi.org/10.1126/sciadv.abq5180 https://serval.unil.ch/resource/serval:BIB_41A66AA5C6FE.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_41A66AA5C6FE5 |
long_lat |
ENVELOPE(-50.167,-50.167,67.183,67.183) ENVELOPE(-46.037,-46.037,60.719,60.719) |
geographic |
Greenland Isunnguata Sermia Kujalleq |
geographic_facet |
Greenland Isunnguata Sermia Kujalleq |
genre |
glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq |
genre_facet |
glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq |
op_source |
Science advances, vol. 9, no. 6, pp. eabq5180 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1126/sciadv.abq5180 info:eu-repo/semantics/altIdentifier/pmid/36763651 info:eu-repo/semantics/altIdentifier/eissn/2375-2548 info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_41A66AA5C6FE5 https://serval.unil.ch/notice/serval:BIB_41A66AA5C6FE doi:10.1126/sciadv.abq5180 urn:issn:2375-2548 https://serval.unil.ch/resource/serval:BIB_41A66AA5C6FE.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_41A66AA5C6FE5 |
op_rights |
info:eu-repo/semantics/openAccess CC BY-NC 4.0 https://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1126/sciadv.abq5180 |
container_title |
Science Advances |
container_volume |
9 |
container_issue |
6 |
_version_ |
1790600434196414464 |