A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica
Calving from tidewater glaciers and ice shelves accounts for around half the mass loss from both polar ice sheets, yet the process is not well represented in prognostic models of ice dynamics. Benn and others proposed a calving criterion appropriate for both grounded and floating glacier tongues or...
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ftnerc:oai:nora.nerc.ac.uk:10852 2023-05-15T13:45:10+02:00 A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica Otero, Jaime Navarro, Francisco J. Martin, Carlos Cuadrado, Maria L. Corcuera, Maria I. 2010 http://nora.nerc.ac.uk/id/eprint/10852/ http://www.igsoc.org/journal/56/196/t09J076.pdf unknown International Glaciological Society Otero, Jaime; Navarro, Francisco J.; Martin, Carlos orcid:0000-0002-2661-169X Cuadrado, Maria L.; Corcuera, Maria I. 2010 A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica. Journal of Glaciology, 56 (196). 200-214. Glaciology Publication - Article PeerReviewed 2010 ftnerc 2023-02-04T19:26:58Z Calving from tidewater glaciers and ice shelves accounts for around half the mass loss from both polar ice sheets, yet the process is not well represented in prognostic models of ice dynamics. Benn and others proposed a calving criterion appropriate for both grounded and floating glacier tongues or ice shelves, based on the penetration depth of transverse crevasses near the calving front, computed using Nye's formula. The criterion is readily incorporated into glacier and ice-sheet models, but has not been fully validated with observations. We apply a three-dimensional extension of Benn and others' criterion, incorporated into a full-Stokes model of glacier dynamics, to estimate the current position of the calving front of Johnsons Glacier, Antarctica. We find that two improvements to the original model are necessary to accurately reproduce the observed calving front: (1) computation of the tensile deviatoric stress opening the crevasse using the full-stress solution and (2) consideration of such a tensile stress as a function of depth. Our modelling results also suggest that Johnsons Glacier has a polythermal structure, rather than the temperate structure suggested by earlier studies. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Sheet Ice Shelves Journal of Glaciology Livingston Island Tidewater Natural Environment Research Council: NERC Open Research Archive Johnsons ENVELOPE(-60.350,-60.350,-62.665,-62.665) Johnsons Glacier ENVELOPE(-60.361,-60.361,-62.668,-62.668) Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
institution |
Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
topic |
Glaciology |
spellingShingle |
Glaciology Otero, Jaime Navarro, Francisco J. Martin, Carlos Cuadrado, Maria L. Corcuera, Maria I. A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica |
topic_facet |
Glaciology |
description |
Calving from tidewater glaciers and ice shelves accounts for around half the mass loss from both polar ice sheets, yet the process is not well represented in prognostic models of ice dynamics. Benn and others proposed a calving criterion appropriate for both grounded and floating glacier tongues or ice shelves, based on the penetration depth of transverse crevasses near the calving front, computed using Nye's formula. The criterion is readily incorporated into glacier and ice-sheet models, but has not been fully validated with observations. We apply a three-dimensional extension of Benn and others' criterion, incorporated into a full-Stokes model of glacier dynamics, to estimate the current position of the calving front of Johnsons Glacier, Antarctica. We find that two improvements to the original model are necessary to accurately reproduce the observed calving front: (1) computation of the tensile deviatoric stress opening the crevasse using the full-stress solution and (2) consideration of such a tensile stress as a function of depth. Our modelling results also suggest that Johnsons Glacier has a polythermal structure, rather than the temperate structure suggested by earlier studies. |
format |
Article in Journal/Newspaper |
author |
Otero, Jaime Navarro, Francisco J. Martin, Carlos Cuadrado, Maria L. Corcuera, Maria I. |
author_facet |
Otero, Jaime Navarro, Francisco J. Martin, Carlos Cuadrado, Maria L. Corcuera, Maria I. |
author_sort |
Otero, Jaime |
title |
A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica |
title_short |
A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica |
title_full |
A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica |
title_fullStr |
A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica |
title_full_unstemmed |
A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica |
title_sort |
three-dimensional calving model: numerical experiments on johnsons glacier, livingston island, antarctica |
publisher |
International Glaciological Society |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/10852/ http://www.igsoc.org/journal/56/196/t09J076.pdf |
long_lat |
ENVELOPE(-60.350,-60.350,-62.665,-62.665) ENVELOPE(-60.361,-60.361,-62.668,-62.668) ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Johnsons Johnsons Glacier Livingston Island |
geographic_facet |
Johnsons Johnsons Glacier Livingston Island |
genre |
Antarc* Antarctica Antarctica Journal Ice Sheet Ice Shelves Journal of Glaciology Livingston Island Tidewater |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Sheet Ice Shelves Journal of Glaciology Livingston Island Tidewater |
op_relation |
Otero, Jaime; Navarro, Francisco J.; Martin, Carlos orcid:0000-0002-2661-169X Cuadrado, Maria L.; Corcuera, Maria I. 2010 A three-dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica. Journal of Glaciology, 56 (196). 200-214. |
_version_ |
1766214329938477056 |