Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier
International audience In ice-sheet models, slip conditions at the base between the ice and the bed are parameterized by a friction law. The most common relation has two poorly constrained parameters, C and m. The basal slipperiness coefficient, C, depends on local unobserved quantities and is routi...
Published in: | Geophysical Research Letters |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2016
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Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03706535 https://hal-insu.archives-ouvertes.fr/insu-03706535/document https://hal-insu.archives-ouvertes.fr/insu-03706535/file/Geophysical%20Research%20Letters%20-%202016%20-%20Gillet%25u2010Chaulet%20-%20Assimilation%20of%20surface%20velocities%20acquired%20between%201996%20and%202010%20to.pdf https://doi.org/10.1002/2016GL069937 |
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ftunivnantes:oai:HAL:insu-03706535v1 |
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openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
ice flow modeling subglacial conditions inverse modeling [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
ice flow modeling subglacial conditions inverse modeling [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Gillet-Chaulet, F. Durand, G. Gagliardini, O. Mosbeux, C. Mouginot, J. Rémy, F. Ritz, C. Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier |
topic_facet |
ice flow modeling subglacial conditions inverse modeling [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience In ice-sheet models, slip conditions at the base between the ice and the bed are parameterized by a friction law. The most common relation has two poorly constrained parameters, C and m. The basal slipperiness coefficient, C, depends on local unobserved quantities and is routinely inferred using inverse methods. While model results have shown that transient responses to external forcing are highly sensitive to the stress exponent m, no consensus value has emerged, with values commonly used ranging from 1 to ∞ depending on the slip processes. By assimilation of Pine Island Glacier surface velocities from 1996 to 2010, we show that observed accelerations are best reproduced with m≥5. We conclude that basal motion, in much of the fast flowing region, is governed by plastic deformation of the underlying sediments. This implies that the glacier bed in this area cannot deliver resistive stresses higher than today, making the drainage basin potentially more sensitive to dynamical perturbations than predicted with models using standard values m = 1 or 3. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Gillet-Chaulet, F. Durand, G. Gagliardini, O. Mosbeux, C. Mouginot, J. Rémy, F. Ritz, C. |
author_facet |
Gillet-Chaulet, F. Durand, G. Gagliardini, O. Mosbeux, C. Mouginot, J. Rémy, F. Ritz, C. |
author_sort |
Gillet-Chaulet, F. |
title |
Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier |
title_short |
Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier |
title_full |
Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier |
title_fullStr |
Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier |
title_full_unstemmed |
Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier |
title_sort |
assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under pine island glacier |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03706535 https://hal-insu.archives-ouvertes.fr/insu-03706535/document https://hal-insu.archives-ouvertes.fr/insu-03706535/file/Geophysical%20Research%20Letters%20-%202016%20-%20Gillet%25u2010Chaulet%20-%20Assimilation%20of%20surface%20velocities%20acquired%20between%201996%20and%202010%20to.pdf https://doi.org/10.1002/2016GL069937 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Pine Island Glacier |
geographic_facet |
Pine Island Glacier |
genre |
Ice Sheet Pine Island Glacier |
genre_facet |
Ice Sheet Pine Island Glacier |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal-insu.archives-ouvertes.fr/insu-03706535 Geophysical Research Letters, 2016, 43, pp.10,311-10,321. ⟨10.1002/2016GL069937⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GL069937 insu-03706535 https://hal-insu.archives-ouvertes.fr/insu-03706535 https://hal-insu.archives-ouvertes.fr/insu-03706535/document https://hal-insu.archives-ouvertes.fr/insu-03706535/file/Geophysical%20Research%20Letters%20-%202016%20-%20Gillet%25u2010Chaulet%20-%20Assimilation%20of%20surface%20velocities%20acquired%20between%201996%20and%202010%20to.pdf BIBCODE: 2016GeoRL.4310311G doi:10.1002/2016GL069937 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016GL069937 |
container_title |
Geophysical Research Letters |
container_volume |
43 |
container_issue |
19 |
container_start_page |
10,311 |
op_container_end_page |
10,321 |
_version_ |
1766031419240349696 |
spelling |
ftunivnantes:oai:HAL:insu-03706535v1 2023-05-15T16:40:59+02:00 Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier Gillet-Chaulet, F. Durand, G. Gagliardini, O. Mosbeux, C. Mouginot, J. Rémy, F. Ritz, C. Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) 2016 https://hal-insu.archives-ouvertes.fr/insu-03706535 https://hal-insu.archives-ouvertes.fr/insu-03706535/document https://hal-insu.archives-ouvertes.fr/insu-03706535/file/Geophysical%20Research%20Letters%20-%202016%20-%20Gillet%25u2010Chaulet%20-%20Assimilation%20of%20surface%20velocities%20acquired%20between%201996%20and%202010%20to.pdf https://doi.org/10.1002/2016GL069937 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GL069937 insu-03706535 https://hal-insu.archives-ouvertes.fr/insu-03706535 https://hal-insu.archives-ouvertes.fr/insu-03706535/document https://hal-insu.archives-ouvertes.fr/insu-03706535/file/Geophysical%20Research%20Letters%20-%202016%20-%20Gillet%25u2010Chaulet%20-%20Assimilation%20of%20surface%20velocities%20acquired%20between%201996%20and%202010%20to.pdf BIBCODE: 2016GeoRL.4310311G doi:10.1002/2016GL069937 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal-insu.archives-ouvertes.fr/insu-03706535 Geophysical Research Letters, 2016, 43, pp.10,311-10,321. ⟨10.1002/2016GL069937⟩ ice flow modeling subglacial conditions inverse modeling [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2016 ftunivnantes https://doi.org/10.1002/2016GL069937 2023-03-01T01:36:31Z International audience In ice-sheet models, slip conditions at the base between the ice and the bed are parameterized by a friction law. The most common relation has two poorly constrained parameters, C and m. The basal slipperiness coefficient, C, depends on local unobserved quantities and is routinely inferred using inverse methods. While model results have shown that transient responses to external forcing are highly sensitive to the stress exponent m, no consensus value has emerged, with values commonly used ranging from 1 to ∞ depending on the slip processes. By assimilation of Pine Island Glacier surface velocities from 1996 to 2010, we show that observed accelerations are best reproduced with m≥5. We conclude that basal motion, in much of the fast flowing region, is governed by plastic deformation of the underlying sediments. This implies that the glacier bed in this area cannot deliver resistive stresses higher than today, making the drainage basin potentially more sensitive to dynamical perturbations than predicted with models using standard values m = 1 or 3. Article in Journal/Newspaper Ice Sheet Pine Island Glacier Université de Nantes: HAL-UNIV-NANTES Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Geophysical Research Letters 43 19 10,311 10,321 |