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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Online Access: | https://research-portal.st-andrews.ac.uk/en/publications/53b192ea-7697-47f3-a637-d18304d0ef53 https://doi.org/10.3189/002214310794457344 |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/53b192ea-7697-47f3-a637-d18304d0ef53 2024-10-06T13:48:17+00:00 A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics Nick, F. M. van der Veen, C. J. Vieli, A. Benn, Doug I 2010 https://research-portal.st-andrews.ac.uk/en/publications/53b192ea-7697-47f3-a637-d18304d0ef53 https://doi.org/10.3189/002214310794457344 eng eng https://research-portal.st-andrews.ac.uk/en/publications/53b192ea-7697-47f3-a637-d18304d0ef53 info:eu-repo/semantics/restrictedAccess Nick , F M , van der Veen , C J , Vieli , A & Benn , D I 2010 , ' A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics ' , Journal of Glaciology , vol. 56 , no. 199 , pp. 781-794 . https://doi.org/10.3189/002214310794457344 WEST GREENLAND GREENLAND ICE-SHEET ACCELERATION FRACTURE-MECHANICS APPROACH TIDEWATER GLACIERS JAKOBSHAVN ISBRAE BOTTOM CREVASSES VELOCITY EAST GREENLAND RETREAT article 2010 ftunstandrewcris https://doi.org/10.3189/002214310794457344 2024-09-18T23:42:20Z 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. Article in Journal/Newspaper East Greenland glacier Greenland Ice Sheet Ice Shelves Jakobshavn Journal of Glaciology Tidewater University of St Andrews: Research Portal Greenland Journal of Glaciology 56 199 781 794 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
WEST GREENLAND GREENLAND ICE-SHEET ACCELERATION FRACTURE-MECHANICS APPROACH TIDEWATER GLACIERS JAKOBSHAVN ISBRAE BOTTOM CREVASSES VELOCITY EAST GREENLAND RETREAT |
spellingShingle |
WEST GREENLAND GREENLAND ICE-SHEET ACCELERATION FRACTURE-MECHANICS APPROACH TIDEWATER GLACIERS JAKOBSHAVN ISBRAE BOTTOM CREVASSES VELOCITY EAST GREENLAND RETREAT Nick, F. M. van der Veen, C. J. Vieli, A. Benn, Doug I A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics |
topic_facet |
WEST GREENLAND GREENLAND ICE-SHEET ACCELERATION FRACTURE-MECHANICS APPROACH TIDEWATER GLACIERS JAKOBSHAVN ISBRAE BOTTOM CREVASSES VELOCITY EAST GREENLAND RETREAT |
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. |
format |
Article in Journal/Newspaper |
author |
Nick, F. M. van der Veen, C. J. Vieli, A. Benn, Doug I |
author_facet |
Nick, F. M. van der Veen, C. J. Vieli, A. Benn, Doug I |
author_sort |
Nick, F. M. |
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 |
https://research-portal.st-andrews.ac.uk/en/publications/53b192ea-7697-47f3-a637-d18304d0ef53 https://doi.org/10.3189/002214310794457344 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland glacier Greenland Ice Sheet Ice Shelves Jakobshavn Journal of Glaciology Tidewater |
genre_facet |
East Greenland glacier Greenland Ice Sheet Ice Shelves Jakobshavn Journal of Glaciology Tidewater |
op_source |
Nick , F M , van der Veen , C J , Vieli , A & Benn , D I 2010 , ' A physically based calving model applied to marine outlet glaciers and implications for the glacier dynamics ' , Journal of Glaciology , vol. 56 , no. 199 , pp. 781-794 . https://doi.org/10.3189/002214310794457344 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/publications/53b192ea-7697-47f3-a637-d18304d0ef53 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3189/002214310794457344 |
container_title |
Journal of Glaciology |
container_volume |
56 |
container_issue |
199 |
container_start_page |
781 |
op_container_end_page |
794 |
_version_ |
1812176424569667584 |