Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses.
The arctic sea ice is a solid plate that floats on the ocean over several millions of squared kilometers. Temporal and spatial variations of the sea ice thickness control the mechanical and thermal exchanges between the arctic atmosphere and the Arctic Ocean. This later plays a fundamental role on t...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2008
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Online Access: | https://theses.hal.science/tel-00352799 https://theses.hal.science/tel-00352799/document https://theses.hal.science/tel-00352799/file/These_Rampal.pdf |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
French |
topic |
Arctic sea ice drift Lagrangian trajectories trajectoires lagrangiennes diffusion dispersion turbulence glace de mer Arctique dérive déformation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Arctic sea ice drift Lagrangian trajectories trajectoires lagrangiennes diffusion dispersion turbulence glace de mer Arctique dérive déformation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Rampal, Pierre Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses. |
topic_facet |
Arctic sea ice drift Lagrangian trajectories trajectoires lagrangiennes diffusion dispersion turbulence glace de mer Arctique dérive déformation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
The arctic sea ice is a solid plate that floats on the ocean over several millions of squared kilometers. Temporal and spatial variations of the sea ice thickness control the mechanical and thermal exchanges between the arctic atmosphere and the Arctic Ocean. This later plays a fundamental role on the thermohaline circulation, and consequently, on the earth climate. Thus, as it isolates the ocean from the atmosphere, the sea ice cover can be viewed as a key parameter of the global climate. Since approximately five decades, we can observe a significant sea ice shrinking, which accelerated during the last years. All the most sophisticated global climate models under-estimate this acceleration. In this work, we show that this under-estimation can be due to the modeling framework used in these models: indeed, the sea ice cover is modeled as a viscous plastic material and, as an example, do not exhibit some fundamental properties of its dynamics, i.e. the intermittency and the heterogeneity of its deformation field. Then, the induced fracturing of the sea ice cover is not reproduced, and its consequences in terms of energy exchanges between the atmosphere and the ocean are neglected. We suggest that the arctic sea ice has to be considered as a deforming solid plate, and modeled with an alesto-brittle rheology. La banquise arctique est une plaque de glace flottant à la surface de l'océan sur plusieurs millions de km2. La variation spatiale et temporelle de son épaisseur contrôle les échanges d'énergie mécanique et thermique entre l'atmosphère et l'océan. De ce fait, la banquise est une sorte d'isolant pour l'océan arctique, qui lui même joue un rôle déterminant dans la circulation thermohaline de l'océan mondial, et par voie de conséquence sur le climat de la planète. On observe une disparition significative et progressive de la banquise depuis environ un demi siècle, disparition qui s'est accélérée au cours des dernières années, a tel point qu'elle dépasse les prévisions les plus alarmistes des modèles les plus ... |
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 Joseph-Fourier - Grenoble I Jérôme Weiss(weiss@lgge.obs.ujf-grenoble.fr) |
format |
Doctoral or Postdoctoral Thesis |
author |
Rampal, Pierre |
author_facet |
Rampal, Pierre |
author_sort |
Rampal, Pierre |
title |
Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses. |
title_short |
Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses. |
title_full |
Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses. |
title_fullStr |
Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses. |
title_full_unstemmed |
Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses. |
title_sort |
analyses of the arctic sea ice drift and deformation properties from lagrangian trajectories analyses. |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://theses.hal.science/tel-00352799 https://theses.hal.science/tel-00352799/document https://theses.hal.science/tel-00352799/file/These_Rampal.pdf |
genre |
Arctic Arctic Ocean Arctique* banquise Sea ice |
genre_facet |
Arctic Arctic Ocean Arctique* banquise Sea ice |
op_source |
https://theses.hal.science/tel-00352799 Océan, Atmosphère. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨NNT : ⟩ |
op_relation |
tel-00352799 https://theses.hal.science/tel-00352799 https://theses.hal.science/tel-00352799/document https://theses.hal.science/tel-00352799/file/These_Rampal.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1797576757661925376 |
spelling |
ftinsu:oai:HAL:tel-00352799v1 2024-04-28T08:07:44+00:00 Analyses of the Arctic sea ice drift and deformation properties from Lagrangian trajectories analyses. Etude de la dérive et de la déformation de la banquise Arctique par l'analyse de trajectoires Lagrangiennes Rampal, Pierre 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 Joseph-Fourier - Grenoble I Jérôme Weiss(weiss@lgge.obs.ujf-grenoble.fr) 2008-11-06 https://theses.hal.science/tel-00352799 https://theses.hal.science/tel-00352799/document https://theses.hal.science/tel-00352799/file/These_Rampal.pdf fr fre HAL CCSD tel-00352799 https://theses.hal.science/tel-00352799 https://theses.hal.science/tel-00352799/document https://theses.hal.science/tel-00352799/file/These_Rampal.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-00352799 Océan, Atmosphère. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨NNT : ⟩ Arctic sea ice drift Lagrangian trajectories trajectoires lagrangiennes diffusion dispersion turbulence glace de mer Arctique dérive déformation [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/doctoralThesis Theses 2008 ftinsu 2024-04-05T00:35:13Z The arctic sea ice is a solid plate that floats on the ocean over several millions of squared kilometers. Temporal and spatial variations of the sea ice thickness control the mechanical and thermal exchanges between the arctic atmosphere and the Arctic Ocean. This later plays a fundamental role on the thermohaline circulation, and consequently, on the earth climate. Thus, as it isolates the ocean from the atmosphere, the sea ice cover can be viewed as a key parameter of the global climate. Since approximately five decades, we can observe a significant sea ice shrinking, which accelerated during the last years. All the most sophisticated global climate models under-estimate this acceleration. In this work, we show that this under-estimation can be due to the modeling framework used in these models: indeed, the sea ice cover is modeled as a viscous plastic material and, as an example, do not exhibit some fundamental properties of its dynamics, i.e. the intermittency and the heterogeneity of its deformation field. Then, the induced fracturing of the sea ice cover is not reproduced, and its consequences in terms of energy exchanges between the atmosphere and the ocean are neglected. We suggest that the arctic sea ice has to be considered as a deforming solid plate, and modeled with an alesto-brittle rheology. La banquise arctique est une plaque de glace flottant à la surface de l'océan sur plusieurs millions de km2. La variation spatiale et temporelle de son épaisseur contrôle les échanges d'énergie mécanique et thermique entre l'atmosphère et l'océan. De ce fait, la banquise est une sorte d'isolant pour l'océan arctique, qui lui même joue un rôle déterminant dans la circulation thermohaline de l'océan mondial, et par voie de conséquence sur le climat de la planète. On observe une disparition significative et progressive de la banquise depuis environ un demi siècle, disparition qui s'est accélérée au cours des dernières années, a tel point qu'elle dépasse les prévisions les plus alarmistes des modèles les plus ... Doctoral or Postdoctoral Thesis Arctic Arctic Ocean Arctique* banquise Sea ice Institut national des sciences de l'Univers: HAL-INSU |