Simulating ice-shelf extent using damage mechanics
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-m...
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Online Access: | http://www.osti.gov/servlets/purl/1885457 https://www.osti.gov/biblio/1885457 https://doi.org/10.1017/jog.2022.12 |
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ftosti:oai:osti.gov:1885457 2023-07-30T03:55:57+02:00 Simulating ice-shelf extent using damage mechanics Kachuck, Samuel B. Whitcomb, Morgan Bassis, Jeremy N. Martin, Daniel F. Price, Stephen F. 2023-02-23 application/pdf http://www.osti.gov/servlets/purl/1885457 https://www.osti.gov/biblio/1885457 https://doi.org/10.1017/jog.2022.12 unknown http://www.osti.gov/servlets/purl/1885457 https://www.osti.gov/biblio/1885457 https://doi.org/10.1017/jog.2022.12 doi:10.1017/jog.2022.12 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1017/jog.2022.12 2023-07-11T10:14:35Z 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. Other/Unknown Material Amery Ice Shelf Antarc* Antarctic Erebus Glacier Ice Sheet Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Antarctic The Antarctic Ross Ice Shelf Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Drygalski ENVELOPE(-61.000,-61.000,-64.717,-64.717) Drygalski Ice Tongue ENVELOPE(163.500,163.500,-75.400,-75.400) Erebus Glacier ENVELOPE(167.000,167.000,-77.683,-77.683) Erebus Glacier Tongue ENVELOPE(166.667,166.667,-77.700,-77.700) Journal of Glaciology 1 12 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Kachuck, Samuel B. Whitcomb, Morgan Bassis, Jeremy N. Martin, Daniel F. Price, Stephen F. Simulating ice-shelf extent using damage mechanics |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
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. |
author |
Kachuck, Samuel B. Whitcomb, Morgan Bassis, Jeremy N. Martin, Daniel F. Price, Stephen F. |
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 |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1885457 https://www.osti.gov/biblio/1885457 https://doi.org/10.1017/jog.2022.12 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(-61.000,-61.000,-64.717,-64.717) ENVELOPE(163.500,163.500,-75.400,-75.400) ENVELOPE(167.000,167.000,-77.683,-77.683) ENVELOPE(166.667,166.667,-77.700,-77.700) |
geographic |
Antarctic The Antarctic Ross Ice Shelf Amery Amery Ice Shelf Drygalski Drygalski Ice Tongue Erebus Glacier Erebus Glacier Tongue |
geographic_facet |
Antarctic The Antarctic Ross Ice Shelf Amery Amery Ice Shelf Drygalski Drygalski Ice Tongue Erebus Glacier Erebus Glacier Tongue |
genre |
Amery Ice Shelf Antarc* Antarctic Erebus Glacier Ice Sheet Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Erebus Glacier Ice Sheet Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf |
op_relation |
http://www.osti.gov/servlets/purl/1885457 https://www.osti.gov/biblio/1885457 https://doi.org/10.1017/jog.2022.12 doi:10.1017/jog.2022.12 |
op_doi |
https://doi.org/10.1017/jog.2022.12 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
12 |
_version_ |
1772810377349824512 |