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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2022
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ftcdlib:oai:escholarship.org:ark:/13030/qt91x9v6hf 2023-06-11T04:03:28+02:00 Simulating ice-shelf extent using damage mechanics Kachuck, Samuel B Whitcomb, Morgan Bassis, Jeremy N Martin, Daniel F Price, Stephen F 987 - 998 2022-10-01 application/pdf https://escholarship.org/uc/item/91x9v6hf unknown eScholarship, University of California qt91x9v6hf https://escholarship.org/uc/item/91x9v6hf public Journal of Glaciology, vol 68, iss 271 Climate Action Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences article 2022 ftcdlib 2023-05-29T17:58:22Z 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 University of California: eScholarship Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic 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) Ross Ice Shelf The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
spellingShingle |
Climate Action Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences Kachuck, Samuel B Whitcomb, Morgan Bassis, Jeremy N Martin, Daniel F Price, Stephen F Simulating ice-shelf extent using damage mechanics |
topic_facet |
Climate Action Physical Geography and Environmental Geoscience Meteorology & Atmospheric 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. |
format |
Article in Journal/Newspaper |
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 |
publisher |
eScholarship, University of California |
publishDate |
2022 |
url |
https://escholarship.org/uc/item/91x9v6hf |
op_coverage |
987 - 998 |
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 |
Amery Amery Ice Shelf Antarctic Drygalski Drygalski Ice Tongue Erebus Glacier Erebus Glacier Tongue Ross Ice Shelf The Antarctic |
geographic_facet |
Amery Amery Ice Shelf Antarctic Drygalski Drygalski Ice Tongue Erebus Glacier Erebus Glacier Tongue Ross Ice Shelf The Antarctic |
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, vol 68, iss 271 |
op_relation |
qt91x9v6hf https://escholarship.org/uc/item/91x9v6hf |
op_rights |
public |
_version_ |
1768379741748854784 |