Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge
International audience Variegated Glacier (Alaska) is known to surge periodically after a sufficient amount of cumulative mass balance is reached, but this observation is difficult to link with changes in the basal conditions. Here, using a 10-yr dataset, consisting of surface topography and surface...
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
2011
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Online Access: | https://inria.hal.science/inria-00594996 https://inria.hal.science/inria-00594996/document https://inria.hal.science/inria-00594996/file/tcd-5-1461-2011.pdf https://doi.org/10.5194/tc-5-659-2011 |
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Portail HAL-ANR (Agence Nationale de la Recherche) |
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language |
English |
topic |
[MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC] [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
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[MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC] [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Jay-Allemand, Maxime Gillet-Chaulet, Fabien Gagliardini, Olivier Nodet, Maëlle Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge |
topic_facet |
[MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC] [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Variegated Glacier (Alaska) is known to surge periodically after a sufficient amount of cumulative mass balance is reached, but this observation is difficult to link with changes in the basal conditions. Here, using a 10-yr dataset, consisting of surface topography and surface velocity observations along a flow line for 25 dates, we have reconstructed the evolution of the basal conditions prior to and during the 1982-1983 surge. The model solves the full-Stokes problem along the central flow line using the finite element method. For the 25 dates of the dataset, the basal friction parameter distribution is inferred using the inverse method proposed by Arthern and Gudmundsson (2010). This method is here slightly modified by incorporating a regularisation term in the cost function to avoid short wavelength changes in the friction parameter. Our results indicate that dramatic changes in the basal conditions occurred between 1973 to 1983. Prior to the surge, periodic changes can be observed between winter and summer, with a regular increase of the sliding from 1973 to 1982. During the surge, the basal friction decreased dramatically and an area of very low friction moved from the upper part of the glacier to its terminus. Using a more complex friction law, these changes in basal sliding are then interpreted in terms of basal water pressure. Our results support that dramatic changes took place in the subglacial drainage system of Variegated Glacier, moving from a relatively efficient drainage system prior to the surge to an inefficient one during the surge. By reconstructing the water pressure evolution at the base of the glacier it is possible to propose a scenario for the hydrological history leading to the occurrence of a surge. |
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) EDGe 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)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Modelling, Observations, Identification for Environmental Sciences (MOISE) Inria Grenoble - Rhône-Alpes Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Jean Kuntzmann (LJK) Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) ANR-09-SYSC-0001,ADAGE,Modèles adjoints d'écoulement de la glace pour l'assimilation de données en glaciologie(2009) European Project: 226375,EC:FP7:ENV,FP7-ENV-2008-1,ICE2SEA(2009) |
format |
Article in Journal/Newspaper |
author |
Jay-Allemand, Maxime Gillet-Chaulet, Fabien Gagliardini, Olivier Nodet, Maëlle |
author_facet |
Jay-Allemand, Maxime Gillet-Chaulet, Fabien Gagliardini, Olivier Nodet, Maëlle |
author_sort |
Jay-Allemand, Maxime |
title |
Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge |
title_short |
Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge |
title_full |
Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge |
title_fullStr |
Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge |
title_full_unstemmed |
Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge |
title_sort |
investigating changes in basal conditions of variegated glacier prior to and during its 1982-1983 surge |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://inria.hal.science/inria-00594996 https://inria.hal.science/inria-00594996/document https://inria.hal.science/inria-00594996/file/tcd-5-1461-2011.pdf https://doi.org/10.5194/tc-5-659-2011 |
genre |
glacier The Cryosphere Alaska |
genre_facet |
glacier The Cryosphere Alaska |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://inria.hal.science/inria-00594996 The Cryosphere, 2011, 5 (3), pp.659-672. ⟨10.5194/tc-5-659-2011⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-5-659-2011 info:eu-repo/grantAgreement/EC/FP7/226375/EU/Ice2sea - estimating the future contribution of continental ice to sea-level rise/ICE2SEA inria-00594996 https://inria.hal.science/inria-00594996 https://inria.hal.science/inria-00594996/document https://inria.hal.science/inria-00594996/file/tcd-5-1461-2011.pdf doi:10.5194/tc-5-659-2011 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-5-659-2011 |
container_title |
The Cryosphere |
container_volume |
5 |
container_issue |
3 |
container_start_page |
659 |
op_container_end_page |
672 |
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1801375882359603200 |
spelling |
ftanrparis:oai:HAL:inria-00594996v1 2024-06-09T07:46:07+00:00 Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982-1983 surge Jay-Allemand, Maxime Gillet-Chaulet, Fabien Gagliardini, Olivier Nodet, Maëlle 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) EDGe 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)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Modelling, Observations, Identification for Environmental Sciences (MOISE) Inria Grenoble - Rhône-Alpes Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Jean Kuntzmann (LJK) Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) ANR-09-SYSC-0001,ADAGE,Modèles adjoints d'écoulement de la glace pour l'assimilation de données en glaciologie(2009) European Project: 226375,EC:FP7:ENV,FP7-ENV-2008-1,ICE2SEA(2009) 2011-08-23 https://inria.hal.science/inria-00594996 https://inria.hal.science/inria-00594996/document https://inria.hal.science/inria-00594996/file/tcd-5-1461-2011.pdf https://doi.org/10.5194/tc-5-659-2011 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-5-659-2011 info:eu-repo/grantAgreement/EC/FP7/226375/EU/Ice2sea - estimating the future contribution of continental ice to sea-level rise/ICE2SEA inria-00594996 https://inria.hal.science/inria-00594996 https://inria.hal.science/inria-00594996/document https://inria.hal.science/inria-00594996/file/tcd-5-1461-2011.pdf doi:10.5194/tc-5-659-2011 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://inria.hal.science/inria-00594996 The Cryosphere, 2011, 5 (3), pp.659-672. ⟨10.5194/tc-5-659-2011⟩ [MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC] [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2011 ftanrparis https://doi.org/10.5194/tc-5-659-2011 2024-05-16T14:21:54Z International audience Variegated Glacier (Alaska) is known to surge periodically after a sufficient amount of cumulative mass balance is reached, but this observation is difficult to link with changes in the basal conditions. Here, using a 10-yr dataset, consisting of surface topography and surface velocity observations along a flow line for 25 dates, we have reconstructed the evolution of the basal conditions prior to and during the 1982-1983 surge. The model solves the full-Stokes problem along the central flow line using the finite element method. For the 25 dates of the dataset, the basal friction parameter distribution is inferred using the inverse method proposed by Arthern and Gudmundsson (2010). This method is here slightly modified by incorporating a regularisation term in the cost function to avoid short wavelength changes in the friction parameter. Our results indicate that dramatic changes in the basal conditions occurred between 1973 to 1983. Prior to the surge, periodic changes can be observed between winter and summer, with a regular increase of the sliding from 1973 to 1982. During the surge, the basal friction decreased dramatically and an area of very low friction moved from the upper part of the glacier to its terminus. Using a more complex friction law, these changes in basal sliding are then interpreted in terms of basal water pressure. Our results support that dramatic changes took place in the subglacial drainage system of Variegated Glacier, moving from a relatively efficient drainage system prior to the surge to an inefficient one during the surge. By reconstructing the water pressure evolution at the base of the glacier it is possible to propose a scenario for the hydrological history leading to the occurrence of a surge. Article in Journal/Newspaper glacier The Cryosphere Alaska Portail HAL-ANR (Agence Nationale de la Recherche) The Cryosphere 5 3 659 672 |