Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard
International audience The dynamics of Vestfonna ice cap (Svalbard) are dominated by fast-flowing outlet glaciers. Its mass balance is poorly known and affected dynamically by these fast-flowing outlet glaciers. Hence, it is a challenging target for ice flow modeling. Precise knowledge of the basal...
Published in: | The Cryosphere |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Subjects: | |
Online Access: | https://insu.hal.science/insu-00844079 https://insu.hal.science/insu-00844079/document https://insu.hal.science/insu-00844079/file/tc-6-771-2012.pdf https://doi.org/10.5194/tc-6-771-2012 |
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ftunivsavoie:oai:HAL:insu-00844079v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Schäfer, M. Zwinger, T. Christoffersen, P. Gillet-Chaulet, F. Laakso, K. Pettersson, R. Pohjola, V. A. Strozzi, T. Moore, J.C. Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The dynamics of Vestfonna ice cap (Svalbard) are dominated by fast-flowing outlet glaciers. Its mass balance is poorly known and affected dynamically by these fast-flowing outlet glaciers. Hence, it is a challenging target for ice flow modeling. Precise knowledge of the basal conditions and implementation of a good sliding law are crucial for the modeling of this ice cap. Here we use the full-Stokes finite element code Elmer/Ice to model the 3-D flow over the whole ice cap. We use a Robin inverse method to infer the basal friction from the surface velocities observed in 1995. Our results illustrate the importance of the basal friction parameter in reproducing observed velocity fields. We also show the importance of having variable basal friction as given by the inverse method to reproduce the velocity fields of each outlet glacier - a simple parametrization of basal friction cannot give realistic velocities in a forward model. We study the robustness and sensitivity of this method with respect to different parameters (mesh characteristics, ice temperature, errors in topographic and velocity data). The uncertainty in the observational parameters and input data proved to be sufficiently small as not to adversely affect the fidelity of the model. |
author2 |
Arctic Centre University of Lapland Scientific Computing Ltd (CSC) College of Global Change and Earth System Science (GCESS) Beijing Normal University (BNU) Scott Polar Research Institute University of Cambridge UK (CAM) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Earth and Atmospheric Sciences Edmonton University of Alberta Department of Earth Sciences Uppsala Uppsala University Gamma Remote Sensing and Consulting AG Gamma Remote Sensing Research and Consulting AG |
format |
Article in Journal/Newspaper |
author |
Schäfer, M. Zwinger, T. Christoffersen, P. Gillet-Chaulet, F. Laakso, K. Pettersson, R. Pohjola, V. A. Strozzi, T. Moore, J.C. |
author_facet |
Schäfer, M. Zwinger, T. Christoffersen, P. Gillet-Chaulet, F. Laakso, K. Pettersson, R. Pohjola, V. A. Strozzi, T. Moore, J.C. |
author_sort |
Schäfer, M. |
title |
Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard |
title_short |
Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard |
title_full |
Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard |
title_fullStr |
Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard |
title_full_unstemmed |
Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard |
title_sort |
sensitivity of basal conditions in an inverse model: vestfonna ice cap, nordaustlandet/svalbard |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://insu.hal.science/insu-00844079 https://insu.hal.science/insu-00844079/document https://insu.hal.science/insu-00844079/file/tc-6-771-2012.pdf https://doi.org/10.5194/tc-6-771-2012 |
long_lat |
ENVELOPE(22.400,22.400,79.800,79.800) ENVELOPE(20.761,20.761,79.941,79.941) |
geographic |
Svalbard Nordaustlandet Vestfonna |
geographic_facet |
Svalbard Nordaustlandet Vestfonna |
genre |
glacier Ice cap Nordaustlandet Svalbard The Cryosphere Vestfonna |
genre_facet |
glacier Ice cap Nordaustlandet Svalbard The Cryosphere Vestfonna |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://insu.hal.science/insu-00844079 The Cryosphere, 2013, 6, pp.771- 783. ⟨10.5194/tc-6-771-2012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-6-771-2012 insu-00844079 https://insu.hal.science/insu-00844079 https://insu.hal.science/insu-00844079/document https://insu.hal.science/insu-00844079/file/tc-6-771-2012.pdf doi:10.5194/tc-6-771-2012 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-6-771-2012 |
container_title |
The Cryosphere |
container_volume |
6 |
container_issue |
4 |
container_start_page |
771 |
op_container_end_page |
783 |
_version_ |
1798846222057865216 |
spelling |
ftunivsavoie:oai:HAL:insu-00844079v1 2024-05-12T08:04:06+00:00 Sensitivity of basal conditions in an inverse model: Vestfonna ice cap, Nordaustlandet/Svalbard Schäfer, M. Zwinger, T. Christoffersen, P. Gillet-Chaulet, F. Laakso, K. Pettersson, R. Pohjola, V. A. Strozzi, T. Moore, J.C. Arctic Centre University of Lapland Scientific Computing Ltd (CSC) College of Global Change and Earth System Science (GCESS) Beijing Normal University (BNU) Scott Polar Research Institute University of Cambridge UK (CAM) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Earth and Atmospheric Sciences Edmonton University of Alberta Department of Earth Sciences Uppsala Uppsala University Gamma Remote Sensing and Consulting AG Gamma Remote Sensing Research and Consulting AG 2013-07-17 https://insu.hal.science/insu-00844079 https://insu.hal.science/insu-00844079/document https://insu.hal.science/insu-00844079/file/tc-6-771-2012.pdf https://doi.org/10.5194/tc-6-771-2012 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-6-771-2012 insu-00844079 https://insu.hal.science/insu-00844079 https://insu.hal.science/insu-00844079/document https://insu.hal.science/insu-00844079/file/tc-6-771-2012.pdf doi:10.5194/tc-6-771-2012 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://insu.hal.science/insu-00844079 The Cryosphere, 2013, 6, pp.771- 783. ⟨10.5194/tc-6-771-2012⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2013 ftunivsavoie https://doi.org/10.5194/tc-6-771-2012 2024-04-18T00:24:04Z International audience The dynamics of Vestfonna ice cap (Svalbard) are dominated by fast-flowing outlet glaciers. Its mass balance is poorly known and affected dynamically by these fast-flowing outlet glaciers. Hence, it is a challenging target for ice flow modeling. Precise knowledge of the basal conditions and implementation of a good sliding law are crucial for the modeling of this ice cap. Here we use the full-Stokes finite element code Elmer/Ice to model the 3-D flow over the whole ice cap. We use a Robin inverse method to infer the basal friction from the surface velocities observed in 1995. Our results illustrate the importance of the basal friction parameter in reproducing observed velocity fields. We also show the importance of having variable basal friction as given by the inverse method to reproduce the velocity fields of each outlet glacier - a simple parametrization of basal friction cannot give realistic velocities in a forward model. We study the robustness and sensitivity of this method with respect to different parameters (mesh characteristics, ice temperature, errors in topographic and velocity data). The uncertainty in the observational parameters and input data proved to be sufficiently small as not to adversely affect the fidelity of the model. Article in Journal/Newspaper glacier Ice cap Nordaustlandet Svalbard The Cryosphere Vestfonna Université Savoie Mont Blanc: HAL Svalbard Nordaustlandet ENVELOPE(22.400,22.400,79.800,79.800) Vestfonna ENVELOPE(20.761,20.761,79.941,79.941) The Cryosphere 6 4 771 783 |