A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics
We present results from numerical ice-flow models that include calving criteria based on penetration of surface and basal crevasses, which in turn is a function of longitudinal strain rates near the glacier front. The position of the calving front is defined as the point where either (1) surface cre...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/195922 2023-05-15T16:21:21+02:00 A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics Nick, Faezeh Van der Veen, Cornelis J. Vieli, Andreas Benn, Douglas D.I. 2010-12 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/195922 https://dipot.ulb.ac.be/dspace/bitstream/2013/195922/3/doi_179549.pdf en eng uri/info:doi/10.3189/002214310794457344 uri/info:scp/79551703914 https://dipot.ulb.ac.be/dspace/bitstream/2013/195922/3/doi_179549.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/195922 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Journal of Glaciology, 56 (199 Géologie et minéralogie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2010 ftunivbruxelles 2022-06-12T20:33:24Z We present results from numerical ice-flow models that include calving criteria based on penetration of surface and basal crevasses, which in turn is a function of longitudinal strain rates near the glacier front. The position of the calving front is defined as the point where either (1) surface crevasses reach the waterline (model CDw), or (2) surface and basal crevasses penetrate the full thickness of the glacier (model CD). For comparison with previous studies, results are also presented for a height-above-buoyancy calving model. Qualitatively, both models CDw and CD produce similar behaviour. Unlike previous models for calving, the new calving criteria are applicable to both grounded termini and floating ice shelves and tongues. The numerical ice-flow model is applied to an idealized geometry characteristic of marine outlet glaciers. Results indicate that grounding-line dynamics are less sensitive to basal topography than previously suggested. Stable grounding-line positions can be obtained even on a reverse bed slope with or without floating termini. The proposed calving criteria also allow calving losses to be linked to surface melt and therefore climate. In contrast to previous studies in which calving rate or position of the terminus is linked to local water depth, the new calving criterion is able to produce seasonal cycles of retreat and advance as observed for Greenland marine outlet glaciers. The contrasting dynamical behaviour and stability found for different calving models suggests that a realistic parameterization for the process of calving is crucial for any predictions of marine outlet glacier change. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper glacier Greenland Ice Shelves Journal of Glaciology DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Greenland |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géologie et minéralogie |
spellingShingle |
Géologie et minéralogie Nick, Faezeh Van der Veen, Cornelis J. Vieli, Andreas Benn, Douglas D.I. A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
topic_facet |
Géologie et minéralogie |
description |
We present results from numerical ice-flow models that include calving criteria based on penetration of surface and basal crevasses, which in turn is a function of longitudinal strain rates near the glacier front. The position of the calving front is defined as the point where either (1) surface crevasses reach the waterline (model CDw), or (2) surface and basal crevasses penetrate the full thickness of the glacier (model CD). For comparison with previous studies, results are also presented for a height-above-buoyancy calving model. Qualitatively, both models CDw and CD produce similar behaviour. Unlike previous models for calving, the new calving criteria are applicable to both grounded termini and floating ice shelves and tongues. The numerical ice-flow model is applied to an idealized geometry characteristic of marine outlet glaciers. Results indicate that grounding-line dynamics are less sensitive to basal topography than previously suggested. Stable grounding-line positions can be obtained even on a reverse bed slope with or without floating termini. The proposed calving criteria also allow calving losses to be linked to surface melt and therefore climate. In contrast to previous studies in which calving rate or position of the terminus is linked to local water depth, the new calving criterion is able to produce seasonal cycles of retreat and advance as observed for Greenland marine outlet glaciers. The contrasting dynamical behaviour and stability found for different calving models suggests that a realistic parameterization for the process of calving is crucial for any predictions of marine outlet glacier change. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Nick, Faezeh Van der Veen, Cornelis J. Vieli, Andreas Benn, Douglas D.I. |
author_facet |
Nick, Faezeh Van der Veen, Cornelis J. Vieli, Andreas Benn, Douglas D.I. |
author_sort |
Nick, Faezeh |
title |
A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
title_short |
A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
title_full |
A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
title_fullStr |
A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
title_full_unstemmed |
A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
title_sort |
physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
publishDate |
2010 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/195922 https://dipot.ulb.ac.be/dspace/bitstream/2013/195922/3/doi_179549.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Shelves Journal of Glaciology |
genre_facet |
glacier Greenland Ice Shelves Journal of Glaciology |
op_source |
Journal of Glaciology, 56 (199 |
op_relation |
uri/info:doi/10.3189/002214310794457344 uri/info:scp/79551703914 https://dipot.ulb.ac.be/dspace/bitstream/2013/195922/3/doi_179549.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/195922 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766009353648734208 |