The effect of buttressing on grounding line dynamics
ABSTRACT Determining the position and stability of the grounding line of a marine ice sheet is a major challenge for ice-sheet models. Here, we investigate the role of lateral shear and ice-shelf buttressing in grounding line dynamics by extending an existing boundary layer theory to laterally confi...
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Language: | English |
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/jog.2018.30 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000308 |
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crcambridgeupr:10.1017/jog.2018.30 2024-09-30T14:36:36+00:00 The effect of buttressing on grounding line dynamics HASELOFF, MARIANNE SERGIENKO, OLGA V. 2018 http://dx.doi.org/10.1017/jog.2018.30 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000308 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 64, issue 245, page 417-431 ISSN 0022-1430 1727-5652 journal-article 2018 crcambridgeupr https://doi.org/10.1017/jog.2018.30 2024-09-11T04:05:11Z ABSTRACT Determining the position and stability of the grounding line of a marine ice sheet is a major challenge for ice-sheet models. Here, we investigate the role of lateral shear and ice-shelf buttressing in grounding line dynamics by extending an existing boundary layer theory to laterally confined marine ice sheets. We derive an analytic expression for the ice flux at the grounding line of confined marine ice sheets that depends on both local bed properties and non-local ice-shelf properties. Application of these results to a laterally confined version of the MISMIP 1a experiment shows that the boundary condition at the ice-shelf front (i.e. the calving law) is a major control on the location and stability of the grounding line in the presence of buttressing, allowing for both stable and unstable grounding line positions on downwards sloping beds. These results corroborate the findings of existing numerical studies that the stability of confined marine ice sheets is influenced by ice-shelf properties, in contrast to unconfined configurations where grounding line stability is solely determined by the local slope of the bed. Consequently, the marine ice-sheet instability hypothesis may not apply to buttressed marine ice sheets. Article in Journal/Newspaper Ice Sheet Ice Shelf Journal of Glaciology Cambridge University Press Journal of Glaciology 64 245 417 431 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
ABSTRACT Determining the position and stability of the grounding line of a marine ice sheet is a major challenge for ice-sheet models. Here, we investigate the role of lateral shear and ice-shelf buttressing in grounding line dynamics by extending an existing boundary layer theory to laterally confined marine ice sheets. We derive an analytic expression for the ice flux at the grounding line of confined marine ice sheets that depends on both local bed properties and non-local ice-shelf properties. Application of these results to a laterally confined version of the MISMIP 1a experiment shows that the boundary condition at the ice-shelf front (i.e. the calving law) is a major control on the location and stability of the grounding line in the presence of buttressing, allowing for both stable and unstable grounding line positions on downwards sloping beds. These results corroborate the findings of existing numerical studies that the stability of confined marine ice sheets is influenced by ice-shelf properties, in contrast to unconfined configurations where grounding line stability is solely determined by the local slope of the bed. Consequently, the marine ice-sheet instability hypothesis may not apply to buttressed marine ice sheets. |
format |
Article in Journal/Newspaper |
author |
HASELOFF, MARIANNE SERGIENKO, OLGA V. |
spellingShingle |
HASELOFF, MARIANNE SERGIENKO, OLGA V. The effect of buttressing on grounding line dynamics |
author_facet |
HASELOFF, MARIANNE SERGIENKO, OLGA V. |
author_sort |
HASELOFF, MARIANNE |
title |
The effect of buttressing on grounding line dynamics |
title_short |
The effect of buttressing on grounding line dynamics |
title_full |
The effect of buttressing on grounding line dynamics |
title_fullStr |
The effect of buttressing on grounding line dynamics |
title_full_unstemmed |
The effect of buttressing on grounding line dynamics |
title_sort |
effect of buttressing on grounding line dynamics |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/jog.2018.30 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000308 |
genre |
Ice Sheet Ice Shelf Journal of Glaciology |
genre_facet |
Ice Sheet Ice Shelf Journal of Glaciology |
op_source |
Journal of Glaciology volume 64, issue 245, page 417-431 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2018.30 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
245 |
container_start_page |
417 |
op_container_end_page |
431 |
_version_ |
1811639630956593152 |