Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica
Two main contributions dominate the mass balance of Antarctica: surface mass balance, represented by all processes of gain and loss of mass acting at the upper surface (precipitations, melting, sublimation, wind transport.) and dynamical transport from grounded ice to the sea. This transfer takes pl...
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Other Authors: | , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2012
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Subjects: | |
Online Access: | https://theses.hal.science/tel-00843026 https://theses.hal.science/tel-00843026/document https://theses.hal.science/tel-00843026/file/Drouet.pdf |
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ftunigrenoble:oai:HAL:tel-00843026v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
French |
topic |
Simulation Data processing Dynamic Grounding line Modélisation Traitement données Dynamique Ligne d\'échouage [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Simulation Data processing Dynamic Grounding line Modélisation Traitement données Dynamique Ligne d\'échouage [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Drouet, Anne-Sophie Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica |
topic_facet |
Simulation Data processing Dynamic Grounding line Modélisation Traitement données Dynamique Ligne d\'échouage [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
Two main contributions dominate the mass balance of Antarctica: surface mass balance, represented by all processes of gain and loss of mass acting at the upper surface (precipitations, melting, sublimation, wind transport.) and dynamical transport from grounded ice to the sea. This transfer takes place through outlet glaciers and represents 90% of the total loss of the whole ice sheet volume. These coastal systems act as regulators for the evolution of the ice sheet mass balance and for its contribution to sea level rise. Recently, observations emphasize a relevant decrease of mass balance in certain zones of Antarctica such as the West Coast, and an associated contribution to sea level rise from the ice sheet which increases significantly with respect to thermal expansion. Studying dynamics of outlet glaciers by modelisation thus participates at a better understanding of involved processes and enables to predict their response to any external sollicitations and to assess their potential impact on sea level budget. This work aims at providing with new elements for constraining these ice flow models for Antarctica. It is composed of two main parts. The first one concerns the implementation of physical processes into numerical models, in particular represented by grounding line migration, delimitating the grounded part from the floating one. It is based on 2 dimensionnal synthetic cases. The diversity of flow line ice sheet models is emphasized, with the associated differences and similarities. Most of these models lie on two strong assumptions, e.g. steadyness and dominance of basal sliding on ice flow, which are not always fulfilled. Moreover, the intercomparison work reveals discrepancies between models in terms of sea level contribution suggesting particular caution to be taken when considering corresponding results. Efforts have now to converge towards the validity of assumptions and on methods for implementing grounding line migration. The second part consists in applying the so-called 'full-Stokes' ... |
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) Université de Grenoble Emmanuel Le Meur Gaël Durand |
format |
Doctoral or Postdoctoral Thesis |
author |
Drouet, Anne-Sophie |
author_facet |
Drouet, Anne-Sophie |
author_sort |
Drouet, Anne-Sophie |
title |
Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica |
title_short |
Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica |
title_full |
Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica |
title_fullStr |
Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica |
title_full_unstemmed |
Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica |
title_sort |
dynamics of the outlet glacier : from processes to the application on a real glacier, the astrolabe, east antarctica |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://theses.hal.science/tel-00843026 https://theses.hal.science/tel-00843026/document https://theses.hal.science/tel-00843026/file/Drouet.pdf |
long_lat |
ENVELOPE(140.000,140.000,-66.733,-66.733) |
geographic |
Astrolabe East Antarctica |
geographic_facet |
Astrolabe East Antarctica |
genre |
Antarc* Antarctica Antarctique* East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Antarctique* East Antarctica Ice Sheet |
op_source |
https://theses.hal.science/tel-00843026 Sciences de la Terre. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENU022⟩ |
op_relation |
NNT: 2012GRENU022 tel-00843026 https://theses.hal.science/tel-00843026 https://theses.hal.science/tel-00843026/document https://theses.hal.science/tel-00843026/file/Drouet.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1798835757149847552 |
spelling |
ftunigrenoble:oai:HAL:tel-00843026v1 2024-05-12T07:55:53+00:00 Dynamics of the outlet glacier : from processes to the application on a real glacier, the Astrolabe, East Antarctica Dynamique du glacier émissaire des processus à l'application sur un glacier école, Astrolabe, Antarctique de l'Est Drouet, Anne-Sophie 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) Université de Grenoble Emmanuel Le Meur Gaël Durand 2012-11-09 https://theses.hal.science/tel-00843026 https://theses.hal.science/tel-00843026/document https://theses.hal.science/tel-00843026/file/Drouet.pdf fr fre HAL CCSD NNT: 2012GRENU022 tel-00843026 https://theses.hal.science/tel-00843026 https://theses.hal.science/tel-00843026/document https://theses.hal.science/tel-00843026/file/Drouet.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-00843026 Sciences de la Terre. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENU022⟩ Simulation Data processing Dynamic Grounding line Modélisation Traitement données Dynamique Ligne d\'échouage [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2012 ftunigrenoble 2024-04-18T02:14:38Z Two main contributions dominate the mass balance of Antarctica: surface mass balance, represented by all processes of gain and loss of mass acting at the upper surface (precipitations, melting, sublimation, wind transport.) and dynamical transport from grounded ice to the sea. This transfer takes place through outlet glaciers and represents 90% of the total loss of the whole ice sheet volume. These coastal systems act as regulators for the evolution of the ice sheet mass balance and for its contribution to sea level rise. Recently, observations emphasize a relevant decrease of mass balance in certain zones of Antarctica such as the West Coast, and an associated contribution to sea level rise from the ice sheet which increases significantly with respect to thermal expansion. Studying dynamics of outlet glaciers by modelisation thus participates at a better understanding of involved processes and enables to predict their response to any external sollicitations and to assess their potential impact on sea level budget. This work aims at providing with new elements for constraining these ice flow models for Antarctica. It is composed of two main parts. The first one concerns the implementation of physical processes into numerical models, in particular represented by grounding line migration, delimitating the grounded part from the floating one. It is based on 2 dimensionnal synthetic cases. The diversity of flow line ice sheet models is emphasized, with the associated differences and similarities. Most of these models lie on two strong assumptions, e.g. steadyness and dominance of basal sliding on ice flow, which are not always fulfilled. Moreover, the intercomparison work reveals discrepancies between models in terms of sea level contribution suggesting particular caution to be taken when considering corresponding results. Efforts have now to converge towards the validity of assumptions and on methods for implementing grounding line migration. The second part consists in applying the so-called 'full-Stokes' ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Antarctique* East Antarctica Ice Sheet Université Grenoble Alpes: HAL Astrolabe ENVELOPE(140.000,140.000,-66.733,-66.733) East Antarctica |