Modelling the influence of marine ice on the dynamics of an idealised ice shelf
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 bas...
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Cambridge University Press
2023
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Online Access: | https://doi.org/10.1017/jog.2022.66 https://doaj.org/article/d76c67aa7a5c4f268a1d49c12a541f15 |
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ftdoajarticles:oai:doaj.org/article:d76c67aa7a5c4f268a1d49c12a541f15 2023-05-15T16:40:33+02:00 Modelling the influence of marine ice on the dynamics of an idealised ice shelf Lisa Craw Felicity S. McCormack Sue Cook Jason Roberts Adam Treverrow 2023-04-01T00:00:00Z https://doi.org/10.1017/jog.2022.66 https://doaj.org/article/d76c67aa7a5c4f268a1d49c12a541f15 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143022000661/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.66 0022-1430 1727-5652 https://doaj.org/article/d76c67aa7a5c4f268a1d49c12a541f15 Journal of Glaciology, Vol 69, Pp 342-352 (2023) Ice dynamics ice rheology ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1017/jog.2022.66 2023-03-19T01:31:51Z 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 Directory of Open Access Journals: DOAJ Articles Buttress ENVELOPE(-57.083,-57.083,-63.550,-63.550) Journal of Glaciology 69 274 342 352 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice dynamics ice rheology ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Ice dynamics ice rheology ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Lisa Craw Felicity S. McCormack Sue Cook Jason Roberts Adam Treverrow Modelling the influence of marine ice on the dynamics of an idealised ice shelf |
topic_facet |
Ice dynamics ice rheology ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
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 |
Lisa Craw Felicity S. McCormack Sue Cook Jason Roberts Adam Treverrow |
author_facet |
Lisa Craw Felicity S. McCormack Sue Cook Jason Roberts Adam Treverrow |
author_sort |
Lisa Craw |
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 |
publishDate |
2023 |
url |
https://doi.org/10.1017/jog.2022.66 https://doaj.org/article/d76c67aa7a5c4f268a1d49c12a541f15 |
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, Vol 69, Pp 342-352 (2023) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143022000661/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.66 0022-1430 1727-5652 https://doaj.org/article/d76c67aa7a5c4f268a1d49c12a541f15 |
op_doi |
https://doi.org/10.1017/jog.2022.66 |
container_title |
Journal of Glaciology |
container_volume |
69 |
container_issue |
274 |
container_start_page |
342 |
op_container_end_page |
352 |
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1766030952801239040 |