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Otero García, Jaime ORCID: https://orcid.org/0000-0002-3518-7763, Navarro Valero, Francisco José
ORCID: https://orcid.org/0000-0002-5147-0067, Martin, Carlos, Cuadrado Ebrero, Maria Luisa and Corcuera Labrado, María Isabel
(2010).
A three dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica..
"Journal of Glaciology", v. 56
(n. 196);
pp. 200-214.
ISSN 0022-1430.
https://doi.org/10.3189/002214310791968539.
Title: | A three dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica. |
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Author/s: |
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Item Type: | Article |
Título de Revista/Publicación: | Journal of Glaciology |
Date: | January 2010 |
ISSN: | 0022-1430 |
Volume: | 56 |
Subjects: | |
Faculty: | E.T.S.I. Telecomunicación (UPM) |
Department: | Matemática Aplicada a las Tecnologías de la Información [hasta 2014] |
Creative Commons Licenses: | Recognition - No derivative works - Non commercial |
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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.
Item ID: | 8593 |
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DC Identifier: | https://oa.upm.es/8593/ |
OAI Identifier: | oai:oa.upm.es:8593 |
DOI: | 10.3189/002214310791968539 |
Official URL: | http://www.igsoc.org/journal/56/196/ |
Deposited by: | Memoria Investigacion |
Deposited on: | 10 Aug 2011 08:42 |
Last Modified: | 13 Apr 2023 18:09 |