A three dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica.

Otero García, Jaime and Navarro Valero, Francisco Jose and Martin, Carlos and Cuadrado Ebrero, Maria Luisa and Corcuera Labrado, Maria 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.

Description

Title: A three dimensional calving model: numerical experiments on Johnsons Glacier, Livingston Island, Antarctica.
Author/s:
  • Otero García, Jaime
  • Navarro Valero, Francisco Jose
  • Martin, Carlos
  • Cuadrado Ebrero, Maria Luisa
  • Corcuera Labrado, Maria Isabel
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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Abstract

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.

More information

Item ID: 8593
DC Identifier: http://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: 03 Nov 2016 07:33
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