Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets
Abstract Mass loss from ice shelves is a strong control on grounding-line dynamics. Here we investigate how calving and submarine melt parameterizations affect steady-state grounding-line positions and their stability. Our results indicate that different calving laws with the same melt parameterizat...
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Online Access: | http://dx.doi.org/10.1017/jog.2022.29 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000296 |
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crcambridgeupr:10.1017/jog.2022.29 2024-06-23T07:53:49+00:00 Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets Haseloff, Marianne Sergienko, Olga V. Northumbria University National Oceanic and Atmospheric Administration 2022 http://dx.doi.org/10.1017/jog.2022.29 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000296 en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 68, issue 272, page 1149-1166 ISSN 0022-1430 1727-5652 journal-article 2022 crcambridgeupr https://doi.org/10.1017/jog.2022.29 2024-06-12T04:04:10Z Abstract Mass loss from ice shelves is a strong control on grounding-line dynamics. Here we investigate how calving and submarine melt parameterizations affect steady-state grounding-line positions and their stability. Our results indicate that different calving laws with the same melt parameterization result in more diverse steady-state ice-sheet configurations than different melt parameterizations with the same calving law. We show that the backstress at the grounding line depends on the integrated ice-shelf mass flux. Consequently, ice shelves are most sensitive to high melt rates in the vicinity of their grounding lines. For the same shelf-averaged melt rates, different melt parameterizations can lead to very different ice-shelf configurations and grounding-line positions. If the melt rate depends on the slope of the ice-shelf draft, then the positive feedback between increased melting and steepening of the slope can lead to singular melt rates at the ice-shelf front, producing an apparent lower limit of the shelf front thickness as the ice thickness vanishes over a small boundary layer. Our results illustrate that the evolution of marine ice sheets is highly dependent on ice-shelf mass loss mechanisms, and that existing parameterizations can lead to a wide range of modelled grounding-line behaviours. Article in Journal/Newspaper Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Cambridge University Press Journal of Glaciology 1 18 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Mass loss from ice shelves is a strong control on grounding-line dynamics. Here we investigate how calving and submarine melt parameterizations affect steady-state grounding-line positions and their stability. Our results indicate that different calving laws with the same melt parameterization result in more diverse steady-state ice-sheet configurations than different melt parameterizations with the same calving law. We show that the backstress at the grounding line depends on the integrated ice-shelf mass flux. Consequently, ice shelves are most sensitive to high melt rates in the vicinity of their grounding lines. For the same shelf-averaged melt rates, different melt parameterizations can lead to very different ice-shelf configurations and grounding-line positions. If the melt rate depends on the slope of the ice-shelf draft, then the positive feedback between increased melting and steepening of the slope can lead to singular melt rates at the ice-shelf front, producing an apparent lower limit of the shelf front thickness as the ice thickness vanishes over a small boundary layer. Our results illustrate that the evolution of marine ice sheets is highly dependent on ice-shelf mass loss mechanisms, and that existing parameterizations can lead to a wide range of modelled grounding-line behaviours. |
author2 |
Northumbria University National Oceanic and Atmospheric Administration |
format |
Article in Journal/Newspaper |
author |
Haseloff, Marianne Sergienko, Olga V. |
spellingShingle |
Haseloff, Marianne Sergienko, Olga V. Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets |
author_facet |
Haseloff, Marianne Sergienko, Olga V. |
author_sort |
Haseloff, Marianne |
title |
Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets |
title_short |
Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets |
title_full |
Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets |
title_fullStr |
Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets |
title_full_unstemmed |
Effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets |
title_sort |
effects of calving and submarine melting on steady states and stability of buttressed marine ice sheets |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jog.2022.29 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000296 |
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 68, issue 272, page 1149-1166 ISSN 0022-1430 1727-5652 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2022.29 |
container_title |
Journal of Glaciology |
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1 |
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18 |
_version_ |
1802645647064563712 |