Simulating ice-shelf extent using damage mechanics
Abstract Inaccurate representations of iceberg calving from ice shelves are a large source of uncertainty in mass-loss projections from the Antarctic ice sheet. Here, we address this limitation by implementing and testing a continuum damage-mechanics model in a continental scale ice-sheet model. The...
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2022
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Online Access: | http://dx.doi.org/10.1017/jog.2022.12 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000120 |
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crcambridgeupr:10.1017/jog.2022.12 2024-05-19T07:28:12+00:00 Simulating ice-shelf extent using damage mechanics Kachuck, Samuel B. Whitcomb, Morgan Bassis, Jeremy N. Martin, Daniel F. Price, Stephen F. National Science Foundation U.S. Department of Energy U.S. Department of Energy 2022 http://dx.doi.org/10.1017/jog.2022.12 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000120 en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Journal of Glaciology page 1-12 ISSN 0022-1430 1727-5652 journal-article 2022 crcambridgeupr https://doi.org/10.1017/jog.2022.12 2024-05-02T06:51:10Z Abstract Inaccurate representations of iceberg calving from ice shelves are a large source of uncertainty in mass-loss projections from the Antarctic ice sheet. Here, we address this limitation by implementing and testing a continuum damage-mechanics model in a continental scale ice-sheet model. The damage-mechanics formulation, based on a linear stability analysis and subsequent long-wavelength approximation of crevasses that evolve in a viscous medium, links damage evolution to climate forcing and the large-scale stresses within an ice shelf. We incorporate this model into the BISICLES ice-sheet model and test it by applying it to idealized (1) ice tongues, for which we present analytical solutions and (2) buttressed ice-shelf geometries. Our simulations show that the model reproduces the large disparity in lengths of ice shelves with geometries and melt rates broadly similar to those of four Antarctic ice shelves: Erebus Glacier Tongue (length ~ 13 km), the unembayed portion of Drygalski Ice Tongue (~ 65 km), the Amery Ice Shelf (~ 350 km) and the Ross Ice Shelf (~ 500 km). These results demonstrate that our simple continuum model holds promise for constraining realistic ice-shelf extents in large-scale ice-sheet models in a computationally tractable manner. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Erebus Glacier Ice Sheet Ice Shelf Ice Shelves Iceberg* Journal of Glaciology Ross Ice Shelf Cambridge University Press Journal of Glaciology 1 12 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Inaccurate representations of iceberg calving from ice shelves are a large source of uncertainty in mass-loss projections from the Antarctic ice sheet. Here, we address this limitation by implementing and testing a continuum damage-mechanics model in a continental scale ice-sheet model. The damage-mechanics formulation, based on a linear stability analysis and subsequent long-wavelength approximation of crevasses that evolve in a viscous medium, links damage evolution to climate forcing and the large-scale stresses within an ice shelf. We incorporate this model into the BISICLES ice-sheet model and test it by applying it to idealized (1) ice tongues, for which we present analytical solutions and (2) buttressed ice-shelf geometries. Our simulations show that the model reproduces the large disparity in lengths of ice shelves with geometries and melt rates broadly similar to those of four Antarctic ice shelves: Erebus Glacier Tongue (length ~ 13 km), the unembayed portion of Drygalski Ice Tongue (~ 65 km), the Amery Ice Shelf (~ 350 km) and the Ross Ice Shelf (~ 500 km). These results demonstrate that our simple continuum model holds promise for constraining realistic ice-shelf extents in large-scale ice-sheet models in a computationally tractable manner. |
author2 |
National Science Foundation U.S. Department of Energy U.S. Department of Energy |
format |
Article in Journal/Newspaper |
author |
Kachuck, Samuel B. Whitcomb, Morgan Bassis, Jeremy N. Martin, Daniel F. Price, Stephen F. |
spellingShingle |
Kachuck, Samuel B. Whitcomb, Morgan Bassis, Jeremy N. Martin, Daniel F. Price, Stephen F. Simulating ice-shelf extent using damage mechanics |
author_facet |
Kachuck, Samuel B. Whitcomb, Morgan Bassis, Jeremy N. Martin, Daniel F. Price, Stephen F. |
author_sort |
Kachuck, Samuel B. |
title |
Simulating ice-shelf extent using damage mechanics |
title_short |
Simulating ice-shelf extent using damage mechanics |
title_full |
Simulating ice-shelf extent using damage mechanics |
title_fullStr |
Simulating ice-shelf extent using damage mechanics |
title_full_unstemmed |
Simulating ice-shelf extent using damage mechanics |
title_sort |
simulating ice-shelf extent using damage mechanics |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jog.2022.12 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000120 |
genre |
Amery Ice Shelf Antarc* Antarctic Erebus Glacier Ice Sheet Ice Shelf Ice Shelves Iceberg* Journal of Glaciology Ross Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Erebus Glacier Ice Sheet Ice Shelf Ice Shelves Iceberg* Journal of Glaciology Ross Ice Shelf |
op_source |
Journal of Glaciology page 1-12 ISSN 0022-1430 1727-5652 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2022.12 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
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12 |
_version_ |
1799471766426353664 |