Modelling the influence of marine ice on the dynamics of an idealised ice shelf
Abstract Understanding the dynamic behaviour of ice shelves, specifically the controls on their ability to buttress the flow of ice into the ocean, is critical for predicting future ice-sheet contributions to sea level rise. Many large ice shelves, which are predominantly composed of meteoric ice, h...
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Online Access: | http://dx.doi.org/10.1017/jog.2022.66 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000661 |
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crcambridgeupr:10.1017/jog.2022.66 2024-03-03T08:45:25+00:00 Modelling the influence of marine ice on the dynamics of an idealised ice shelf Craw, Lisa McCormack, Felicity S. Cook, Sue Roberts, Jason Treverrow, Adam 2022 http://dx.doi.org/10.1017/jog.2022.66 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000661 en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 69, issue 274, page 342-352 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2022 crcambridgeupr https://doi.org/10.1017/jog.2022.66 2024-02-08T08:45:25Z Abstract Understanding the dynamic behaviour of ice shelves, specifically the controls on their ability to buttress the flow of ice into the ocean, is critical for predicting future ice-sheet contributions to sea level rise. Many large ice shelves, which are predominantly composed of meteoric ice, have a basal layer of marine ice (formed from accumulated platelets at the ice–ocean interface), comprising up to 40% of their thickness locally. Differences in temperature, chemistry and microstructure between marine and meteoric ice mean the rheological properties of the ice vary throughout the ice shelf. These differences are not explicitly accounted for in ice-sheet modelling applications, and may have an important influence on ice shelf dynamics. We tested the sensitivity of a model of an idealised ice shelf to variations in temperature distribution and flow enhancement, and found that incorporating a realistic thermal profile (where the marine ice layer is isothermal) had an order of magnitude greater effect on ice mass flux and thinning than incorporating the mechanical properties of the marine ice. The presence of marine ice at the ice shelf base has the potential to significantly increase deviatoric stresses at the surface and ice mass flux across the front of an ice shelf. Article in Journal/Newspaper Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Cambridge University Press Buttress ENVELOPE(-57.083,-57.083,-63.550,-63.550) Journal of Glaciology 1 11 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Craw, Lisa McCormack, Felicity S. Cook, Sue Roberts, Jason Treverrow, Adam Modelling the influence of marine ice on the dynamics of an idealised ice shelf |
topic_facet |
Earth-Surface Processes |
description |
Abstract Understanding the dynamic behaviour of ice shelves, specifically the controls on their ability to buttress the flow of ice into the ocean, is critical for predicting future ice-sheet contributions to sea level rise. Many large ice shelves, which are predominantly composed of meteoric ice, have a basal layer of marine ice (formed from accumulated platelets at the ice–ocean interface), comprising up to 40% of their thickness locally. Differences in temperature, chemistry and microstructure between marine and meteoric ice mean the rheological properties of the ice vary throughout the ice shelf. These differences are not explicitly accounted for in ice-sheet modelling applications, and may have an important influence on ice shelf dynamics. We tested the sensitivity of a model of an idealised ice shelf to variations in temperature distribution and flow enhancement, and found that incorporating a realistic thermal profile (where the marine ice layer is isothermal) had an order of magnitude greater effect on ice mass flux and thinning than incorporating the mechanical properties of the marine ice. The presence of marine ice at the ice shelf base has the potential to significantly increase deviatoric stresses at the surface and ice mass flux across the front of an ice shelf. |
format |
Article in Journal/Newspaper |
author |
Craw, Lisa McCormack, Felicity S. Cook, Sue Roberts, Jason Treverrow, Adam |
author_facet |
Craw, Lisa McCormack, Felicity S. Cook, Sue Roberts, Jason Treverrow, Adam |
author_sort |
Craw, Lisa |
title |
Modelling the influence of marine ice on the dynamics of an idealised ice shelf |
title_short |
Modelling the influence of marine ice on the dynamics of an idealised ice shelf |
title_full |
Modelling the influence of marine ice on the dynamics of an idealised ice shelf |
title_fullStr |
Modelling the influence of marine ice on the dynamics of an idealised ice shelf |
title_full_unstemmed |
Modelling the influence of marine ice on the dynamics of an idealised ice shelf |
title_sort |
modelling the influence of marine ice on the dynamics of an idealised ice shelf |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jog.2022.66 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000661 |
long_lat |
ENVELOPE(-57.083,-57.083,-63.550,-63.550) |
geographic |
Buttress |
geographic_facet |
Buttress |
genre |
Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology |
genre_facet |
Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology |
op_source |
Journal of Glaciology volume 69, issue 274, page 342-352 ISSN 0022-1430 1727-5652 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2022.66 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
11 |
_version_ |
1792500975463825408 |