Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland
International audience On glaciers and ice sheets, identifying the relationship between velocity and traction is critical to constrain the bed physics that controls ice flow. Yet in Greenland, these relationships remain unquantified. We determine the spatial relationship between velocity and tractio...
Published in: | The Cryosphere |
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Online Access: | https://hal.science/hal-03382414 https://hal.science/hal-03382414/document https://hal.science/hal-03382414/file/Maier%20et%20al.%20-%202021%20-%20Basal%20traction%20mainly%20dictated%20by%20hard-bed%20physics.pdf https://doi.org/10.5194/tc-15-1435-2021 |
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ftanrparis:oai:HAL:hal-03382414v1 2024-06-09T07:46:16+00:00 Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland Maier, Nathan Gimbert, Florent Gillet-Chaulet, Fabien Gilbert, Adrien Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) ANR-17-CE01-0008,SEISMORIV,Instrumentation sismologique des rivières: un nouveau moyen de quantifier le role des evenements climatiques extremes sur la dynamique des rivières(2017) 2021 https://hal.science/hal-03382414 https://hal.science/hal-03382414/document https://hal.science/hal-03382414/file/Maier%20et%20al.%20-%202021%20-%20Basal%20traction%20mainly%20dictated%20by%20hard-bed%20physics.pdf https://doi.org/10.5194/tc-15-1435-2021 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-1435-2021 hal-03382414 https://hal.science/hal-03382414 https://hal.science/hal-03382414/document https://hal.science/hal-03382414/file/Maier%20et%20al.%20-%202021%20-%20Basal%20traction%20mainly%20dictated%20by%20hard-bed%20physics.pdf doi:10.5194/tc-15-1435-2021 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03382414 The Cryosphere, 2021, 15 (3), pp.1435 - 1451. ⟨10.5194/tc-15-1435-2021⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2021 ftanrparis https://doi.org/10.5194/tc-15-1435-2021 2024-05-16T15:04:35Z International audience On glaciers and ice sheets, identifying the relationship between velocity and traction is critical to constrain the bed physics that controls ice flow. Yet in Greenland, these relationships remain unquantified. We determine the spatial relationship between velocity and traction in all eight major drainage catchments of Greenland. The basal traction is estimated using three different methods over large grid cells to minimize interpretation biases associated with unconstrained rheologic parameters used in numerical inversions. We find the relationships are consistent with our current understanding of basal physics in each catchment. We identify catchments that predominantly show Mohr-Coulomb-like behavior typical of deforming beds or significant cavitation, as well as catchments that predominantly show rate-strengthening behavior typical of Weertman-type hard-bed physics. Overall, the traction relationships suggest that the flow field and surface geometry of the grounded regions in Greenland is mainly dictated by Weertman-type hard-bed physics up to velocities of approximately 450 m yr −1 , except within the Northeast Greenland Ice Stream and areas near floatation. Depending on the catchment, behavior of the fastest-flowing ice (∼ 1000 m yr −1) directly inland from marine-terminating outlets exhibits Weertman-type rate strengthening, Mohr-Coulomb-like behavior, or is not confidently resolved given our methodology. Given the complex basal boundary across Greenland, the relationships are captured reasonably well by simple traction laws which provide a parameterization that can be used to model ice dynamics at large scales. The results and analysis serve as a first constraint on the physics of basal motion over the grounded regions of Greenland and provide unique insight into future dynamics and vulnerabilities in a warming climate. Article in Journal/Newspaper Greenland The Cryosphere Portail HAL-ANR (Agence Nationale de la Recherche) Greenland Weertman ENVELOPE(-67.753,-67.753,-66.972,-66.972) The Cryosphere 15 3 1435 1451 |
institution |
Open Polar |
collection |
Portail HAL-ANR (Agence Nationale de la Recherche) |
op_collection_id |
ftanrparis |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Maier, Nathan Gimbert, Florent Gillet-Chaulet, Fabien Gilbert, Adrien Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience On glaciers and ice sheets, identifying the relationship between velocity and traction is critical to constrain the bed physics that controls ice flow. Yet in Greenland, these relationships remain unquantified. We determine the spatial relationship between velocity and traction in all eight major drainage catchments of Greenland. The basal traction is estimated using three different methods over large grid cells to minimize interpretation biases associated with unconstrained rheologic parameters used in numerical inversions. We find the relationships are consistent with our current understanding of basal physics in each catchment. We identify catchments that predominantly show Mohr-Coulomb-like behavior typical of deforming beds or significant cavitation, as well as catchments that predominantly show rate-strengthening behavior typical of Weertman-type hard-bed physics. Overall, the traction relationships suggest that the flow field and surface geometry of the grounded regions in Greenland is mainly dictated by Weertman-type hard-bed physics up to velocities of approximately 450 m yr −1 , except within the Northeast Greenland Ice Stream and areas near floatation. Depending on the catchment, behavior of the fastest-flowing ice (∼ 1000 m yr −1) directly inland from marine-terminating outlets exhibits Weertman-type rate strengthening, Mohr-Coulomb-like behavior, or is not confidently resolved given our methodology. Given the complex basal boundary across Greenland, the relationships are captured reasonably well by simple traction laws which provide a parameterization that can be used to model ice dynamics at large scales. The results and analysis serve as a first constraint on the physics of basal motion over the grounded regions of Greenland and provide unique insight into future dynamics and vulnerabilities in a warming climate. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) ANR-17-CE01-0008,SEISMORIV,Instrumentation sismologique des rivières: un nouveau moyen de quantifier le role des evenements climatiques extremes sur la dynamique des rivières(2017) |
format |
Article in Journal/Newspaper |
author |
Maier, Nathan Gimbert, Florent Gillet-Chaulet, Fabien Gilbert, Adrien |
author_facet |
Maier, Nathan Gimbert, Florent Gillet-Chaulet, Fabien Gilbert, Adrien |
author_sort |
Maier, Nathan |
title |
Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland |
title_short |
Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland |
title_full |
Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland |
title_fullStr |
Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland |
title_full_unstemmed |
Basal traction mainly dictated by hard-bed physics over grounded regions of Greenland |
title_sort |
basal traction mainly dictated by hard-bed physics over grounded regions of greenland |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03382414 https://hal.science/hal-03382414/document https://hal.science/hal-03382414/file/Maier%20et%20al.%20-%202021%20-%20Basal%20traction%20mainly%20dictated%20by%20hard-bed%20physics.pdf https://doi.org/10.5194/tc-15-1435-2021 |
long_lat |
ENVELOPE(-67.753,-67.753,-66.972,-66.972) |
geographic |
Greenland Weertman |
geographic_facet |
Greenland Weertman |
genre |
Greenland The Cryosphere |
genre_facet |
Greenland The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03382414 The Cryosphere, 2021, 15 (3), pp.1435 - 1451. ⟨10.5194/tc-15-1435-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-1435-2021 hal-03382414 https://hal.science/hal-03382414 https://hal.science/hal-03382414/document https://hal.science/hal-03382414/file/Maier%20et%20al.%20-%202021%20-%20Basal%20traction%20mainly%20dictated%20by%20hard-bed%20physics.pdf doi:10.5194/tc-15-1435-2021 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-15-1435-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
3 |
container_start_page |
1435 |
op_container_end_page |
1451 |
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1801376036618764288 |