A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka
International audience The Gorshkov crater glacier at Ushkovsky volcano, Kamchatka, is characterized by a large aspect ratio and special thermodynamic conditions at the bedrock caused by a locally enhanced and spatially varying geothermal heat flux. Furthermore, large parts of this glacier consist o...
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ftinsu:oai:HAL:insu-00377789v1 2024-04-28T07:55:27+00:00 A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka Zwinger, Thomas Greve, Ralf Gagliardini, Olivier Shiraiwa, Takayuki Lyly, Mikko 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) 2007 https://insu.hal.science/insu-00377789 https://insu.hal.science/insu-00377789/document https://insu.hal.science/insu-00377789/file/a-full-stokes-flow-thermo-mechanical-model-for-firn-and-ice-applied-to-the-gorshkov-crater-glacier-kamchatka.pdf https://doi.org/10.3189/172756407782282543 en eng HAL CCSD Cambridge University Press info:eu-repo/semantics/altIdentifier/doi/10.3189/172756407782282543 insu-00377789 https://insu.hal.science/insu-00377789 https://insu.hal.science/insu-00377789/document https://insu.hal.science/insu-00377789/file/a-full-stokes-flow-thermo-mechanical-model-for-firn-and-ice-applied-to-the-gorshkov-crater-glacier-kamchatka.pdf doi:10.3189/172756407782282543 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0260-3055 EISSN: 1727-5644 Annals of Glaciology https://insu.hal.science/insu-00377789 Annals of Glaciology, 2007, 45 (1), pp.29 à 37. ⟨10.3189/172756407782282543⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2007 ftinsu https://doi.org/10.3189/172756407782282543 2024-04-05T00:38:11Z International audience The Gorshkov crater glacier at Ushkovsky volcano, Kamchatka, is characterized by a large aspect ratio and special thermodynamic conditions at the bedrock caused by a locally enhanced and spatially varying geothermal heat flux. Furthermore, large parts of this glacier consist of firn rather than pure ice, which alters the rheological properties (such as viscosity and compressibility) of the glacier. We present a newly developed, thermo-mechanically coupled, three-dimensional flow model based on the finite-element (FE) modeling software Elmer, and apply it to the Gorshkov crater glacier. By assuming steady-state conditions, the present-day velocity field, temperature field, basal melting rate and age distribution are simulated. We find that flow velocities are generally small (tens of centimeters per year). Horizontal and vertical velocities are of comparable magnitude, which shows that the shallow-ice approximation is not applicable. Owing to the spatially variable volcanic heat flux, the thermal regime at the ice base is cold in the deeper parts of the glacier and temperate in the shallower parts. The measured temperature profile and age horizons at the K2 borehole are reproduced quite well, and remaining discrepancies may be attributed to transient (non-steady-state) conditions. Firn compressibility is identified as a crucial element for the modeling approach. Article in Journal/Newspaper Annals of Glaciology Kamchatka Institut national des sciences de l'Univers: HAL-INSU Annals of Glaciology 45 29 37 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Zwinger, Thomas Greve, Ralf Gagliardini, Olivier Shiraiwa, Takayuki Lyly, Mikko A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The Gorshkov crater glacier at Ushkovsky volcano, Kamchatka, is characterized by a large aspect ratio and special thermodynamic conditions at the bedrock caused by a locally enhanced and spatially varying geothermal heat flux. Furthermore, large parts of this glacier consist of firn rather than pure ice, which alters the rheological properties (such as viscosity and compressibility) of the glacier. We present a newly developed, thermo-mechanically coupled, three-dimensional flow model based on the finite-element (FE) modeling software Elmer, and apply it to the Gorshkov crater glacier. By assuming steady-state conditions, the present-day velocity field, temperature field, basal melting rate and age distribution are simulated. We find that flow velocities are generally small (tens of centimeters per year). Horizontal and vertical velocities are of comparable magnitude, which shows that the shallow-ice approximation is not applicable. Owing to the spatially variable volcanic heat flux, the thermal regime at the ice base is cold in the deeper parts of the glacier and temperate in the shallower parts. The measured temperature profile and age horizons at the K2 borehole are reproduced quite well, and remaining discrepancies may be attributed to transient (non-steady-state) conditions. Firn compressibility is identified as a crucial element for the modeling approach. |
author2 |
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) |
format |
Article in Journal/Newspaper |
author |
Zwinger, Thomas Greve, Ralf Gagliardini, Olivier Shiraiwa, Takayuki Lyly, Mikko |
author_facet |
Zwinger, Thomas Greve, Ralf Gagliardini, Olivier Shiraiwa, Takayuki Lyly, Mikko |
author_sort |
Zwinger, Thomas |
title |
A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka |
title_short |
A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka |
title_full |
A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka |
title_fullStr |
A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka |
title_full_unstemmed |
A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka |
title_sort |
full stokes-flow thermo-mechanical model for firn and ice applied to the gorshkov crater glacier, kamchatka |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://insu.hal.science/insu-00377789 https://insu.hal.science/insu-00377789/document https://insu.hal.science/insu-00377789/file/a-full-stokes-flow-thermo-mechanical-model-for-firn-and-ice-applied-to-the-gorshkov-crater-glacier-kamchatka.pdf https://doi.org/10.3189/172756407782282543 |
genre |
Annals of Glaciology Kamchatka |
genre_facet |
Annals of Glaciology Kamchatka |
op_source |
ISSN: 0260-3055 EISSN: 1727-5644 Annals of Glaciology https://insu.hal.science/insu-00377789 Annals of Glaciology, 2007, 45 (1), pp.29 à 37. ⟨10.3189/172756407782282543⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/172756407782282543 insu-00377789 https://insu.hal.science/insu-00377789 https://insu.hal.science/insu-00377789/document https://insu.hal.science/insu-00377789/file/a-full-stokes-flow-thermo-mechanical-model-for-firn-and-ice-applied-to-the-gorshkov-crater-glacier-kamchatka.pdf doi:10.3189/172756407782282543 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3189/172756407782282543 |
container_title |
Annals of Glaciology |
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45 |
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29 |
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37 |
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1797580011281055744 |