Marine ice sheet dynamics: Hysteresis and neutral equilibrium
International audience The stability of marine ice sheets and outlet glaciers is mostly controlled by the dynamics of their grounding line, i.e., where the bottom contact of the ice changes from bedrock or till to ocean water. The last report of the Intergovernmental Panel on Climate Change has clea...
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ftanrparis:oai:HAL:insu-00420410v1 2024-04-28T08:24:43+00:00 Marine ice sheet dynamics: Hysteresis and neutral equilibrium Durand, Gaël Gagliardini, Olivier de Fleurian, B. Zwinger, T. Le Meur, Emmanuel 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) Scientific Computing Ltd (CSC) ANR-06-VULN-0016,DACOTA,Dynamique des glaciers côtiers et rôle sur le bilan de masse global de l'Antarctique zone atelier du glacier de l'Astrolabe, Terre Adélie(2006) 2009 https://insu.hal.science/insu-00420410 https://insu.hal.science/insu-00420410/document https://insu.hal.science/insu-00420410/file/2008JF001170.pdf https://doi.org/10.1029/2008JF001170 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2008JF001170 insu-00420410 https://insu.hal.science/insu-00420410 https://insu.hal.science/insu-00420410/document https://insu.hal.science/insu-00420410/file/2008JF001170.pdf doi:10.1029/2008JF001170 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://insu.hal.science/insu-00420410 Journal of Geophysical Research, 2009, 114, pp.F03009. ⟨10.1029/2008JF001170⟩ marine ice sheet grounding line full Stokes modeling [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2009 ftanrparis https://doi.org/10.1029/2008JF001170 2024-04-09T15:17:42Z International audience The stability of marine ice sheets and outlet glaciers is mostly controlled by the dynamics of their grounding line, i.e., where the bottom contact of the ice changes from bedrock or till to ocean water. The last report of the Intergovernmental Panel on Climate Change has clearly underlined the poor ability of models to capture the dynamics of outlet glaciers. Here we present computations of grounding line dynamics on the basis of numerical solutions of the full Stokes equations for ice velocity, coupled with the evolution of the air ice– and sea ice–free interfaces. The grounding line position is determined by solving the contact problem between the ice and a rigid bedrock using the finite element code Elmer. Results of the simulations show that marine ice sheets are unstable on upsloping beds and undergo hysteresis under perturbation of ice viscosity, confirming conclusions from boundary layer theory. The present approach also indicates that a 2-D unconfined marine ice sheet sliding over a downsloping bedrock does not exhibit neutral equilibrium. It is shown that mesh resolution around the grounding line is a crucial issue. A very fine grid size (<100 m spacing) is needed in order to achieve consistent results. Article in Journal/Newspaper Ice Sheet Sea ice Portail HAL-ANR (Agence Nationale de la Recherche) Journal of Geophysical Research 114 F3 |
institution |
Open Polar |
collection |
Portail HAL-ANR (Agence Nationale de la Recherche) |
op_collection_id |
ftanrparis |
language |
English |
topic |
marine ice sheet grounding line full Stokes modeling [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
marine ice sheet grounding line full Stokes modeling [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Durand, Gaël Gagliardini, Olivier de Fleurian, B. Zwinger, T. Le Meur, Emmanuel Marine ice sheet dynamics: Hysteresis and neutral equilibrium |
topic_facet |
marine ice sheet grounding line full Stokes modeling [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The stability of marine ice sheets and outlet glaciers is mostly controlled by the dynamics of their grounding line, i.e., where the bottom contact of the ice changes from bedrock or till to ocean water. The last report of the Intergovernmental Panel on Climate Change has clearly underlined the poor ability of models to capture the dynamics of outlet glaciers. Here we present computations of grounding line dynamics on the basis of numerical solutions of the full Stokes equations for ice velocity, coupled with the evolution of the air ice– and sea ice–free interfaces. The grounding line position is determined by solving the contact problem between the ice and a rigid bedrock using the finite element code Elmer. Results of the simulations show that marine ice sheets are unstable on upsloping beds and undergo hysteresis under perturbation of ice viscosity, confirming conclusions from boundary layer theory. The present approach also indicates that a 2-D unconfined marine ice sheet sliding over a downsloping bedrock does not exhibit neutral equilibrium. It is shown that mesh resolution around the grounding line is a crucial issue. A very fine grid size (<100 m spacing) is needed in order to achieve consistent results. |
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) Scientific Computing Ltd (CSC) ANR-06-VULN-0016,DACOTA,Dynamique des glaciers côtiers et rôle sur le bilan de masse global de l'Antarctique zone atelier du glacier de l'Astrolabe, Terre Adélie(2006) |
format |
Article in Journal/Newspaper |
author |
Durand, Gaël Gagliardini, Olivier de Fleurian, B. Zwinger, T. Le Meur, Emmanuel |
author_facet |
Durand, Gaël Gagliardini, Olivier de Fleurian, B. Zwinger, T. Le Meur, Emmanuel |
author_sort |
Durand, Gaël |
title |
Marine ice sheet dynamics: Hysteresis and neutral equilibrium |
title_short |
Marine ice sheet dynamics: Hysteresis and neutral equilibrium |
title_full |
Marine ice sheet dynamics: Hysteresis and neutral equilibrium |
title_fullStr |
Marine ice sheet dynamics: Hysteresis and neutral equilibrium |
title_full_unstemmed |
Marine ice sheet dynamics: Hysteresis and neutral equilibrium |
title_sort |
marine ice sheet dynamics: hysteresis and neutral equilibrium |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://insu.hal.science/insu-00420410 https://insu.hal.science/insu-00420410/document https://insu.hal.science/insu-00420410/file/2008JF001170.pdf https://doi.org/10.1029/2008JF001170 |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://insu.hal.science/insu-00420410 Journal of Geophysical Research, 2009, 114, pp.F03009. ⟨10.1029/2008JF001170⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2008JF001170 insu-00420410 https://insu.hal.science/insu-00420410 https://insu.hal.science/insu-00420410/document https://insu.hal.science/insu-00420410/file/2008JF001170.pdf doi:10.1029/2008JF001170 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2008JF001170 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
F3 |
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1797584824704172032 |