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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ftunivpmadrid:oai:oa.upm.es:8593 2023-06-11T04:06:17+02:00 A three dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica. Otero García, Jaime Navarro Valero, Francisco José Martin, Carlos Cuadrado Ebrero, Maria Luisa Corcuera Labrado, María Isabel 2010-01 application/pdf https://oa.upm.es/8593/ eng eng E.T.S.I. Telecomunicación (UPM) http://www.igsoc.org/journal/56/196/ info:eu-repo/semantics/altIdentifier/doi/10.3189/002214310791968539 https://oa.upm.es/8593/ https://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess Journal of Glaciology, ISSN 0022-1430, 2010-01, Vol. 56, No. 196 Telecomunicaciones Medio Ambiente info:eu-repo/semantics/article Artículo PeerReviewed 2010 ftunivpmadrid https://doi.org/10.3189/002214310791968539 2023-04-18T23:15:39Z 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 Ice Sheet Ice Shelves Journal of Glaciology Livingston Island Tidewater Archivo Digital UPM (Universidad Politécnica de Madrid) Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Johnsons ENVELOPE(-60.350,-60.350,-62.665,-62.665) Johnsons Glacier ENVELOPE(-60.361,-60.361,-62.668,-62.668) Journal of Glaciology 56 196 200 214 |
institution |
Open Polar |
collection |
Archivo Digital UPM (Universidad Politécnica de Madrid) |
op_collection_id |
ftunivpmadrid |
language |
English |
topic |
Telecomunicaciones Medio Ambiente |
spellingShingle |
Telecomunicaciones Medio Ambiente Otero García, Jaime Navarro Valero, Francisco José Martin, Carlos Cuadrado Ebrero, Maria Luisa Corcuera Labrado, María Isabel A three dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica. |
topic_facet |
Telecomunicaciones Medio Ambiente |
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 García, Jaime Navarro Valero, Francisco José Martin, Carlos Cuadrado Ebrero, Maria Luisa Corcuera Labrado, María Isabel |
author_facet |
Otero García, Jaime Navarro Valero, Francisco José Martin, Carlos Cuadrado Ebrero, Maria Luisa Corcuera Labrado, María Isabel |
author_sort |
Otero García, 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 |
E.T.S.I. Telecomunicación (UPM) |
publishDate |
2010 |
url |
https://oa.upm.es/8593/ |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-60.350,-60.350,-62.665,-62.665) ENVELOPE(-60.361,-60.361,-62.668,-62.668) |
geographic |
Livingston Island Johnsons Johnsons Glacier |
geographic_facet |
Livingston Island Johnsons Johnsons Glacier |
genre |
Antarc* Antarctica Ice Sheet Ice Shelves Journal of Glaciology Livingston Island Tidewater |
genre_facet |
Antarc* Antarctica Ice Sheet Ice Shelves Journal of Glaciology Livingston Island Tidewater |
op_source |
Journal of Glaciology, ISSN 0022-1430, 2010-01, Vol. 56, No. 196 |
op_relation |
http://www.igsoc.org/journal/56/196/ info:eu-repo/semantics/altIdentifier/doi/10.3189/002214310791968539 https://oa.upm.es/8593/ |
op_rights |
https://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3189/002214310791968539 |
container_title |
Journal of Glaciology |
container_volume |
56 |
container_issue |
196 |
container_start_page |
200 |
op_container_end_page |
214 |
_version_ |
1768378147034628096 |