The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions
International audience Subglacial bedforms are relevant geomorphic markers for palaeo-glaciological reconstructions. Due to the complexity of thermomechanical interactions between ice, till and water on subglacial beds, their formation processes and significance in palaeo-glaciology are still contro...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://hal.science/hal-04331995 https://hal.science/hal-04331995/document https://hal.science/hal-04331995/file/Verite_al_2024_Kinematic_significance_of_subglacial_bedforms.pdf https://doi.org/10.1016/j.epsl.2023.118510 |
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ftccsdartic:oai:HAL:hal-04331995v1 2024-02-11T10:04:51+01:00 The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions Vérité, Jean Ravier, Édouard Bourgeois, Olivier Pochat, Stéphane Bessin, Paul Laboratoire de Planétologie et Géosciences - Le Mans (LPG - Le Mans) Laboratoire de Planétologie et Géosciences UMR_C 6112 (LPG) Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) 2024 https://hal.science/hal-04331995 https://hal.science/hal-04331995/document https://hal.science/hal-04331995/file/Verite_al_2024_Kinematic_significance_of_subglacial_bedforms.pdf https://doi.org/10.1016/j.epsl.2023.118510 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2023.118510 hal-04331995 https://hal.science/hal-04331995 https://hal.science/hal-04331995/document https://hal.science/hal-04331995/file/Verite_al_2024_Kinematic_significance_of_subglacial_bedforms.pdf doi:10.1016/j.epsl.2023.118510 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-04331995 Earth and Planetary Science Letters, 2024, 626, pp.118510. ⟨10.1016/j.epsl.2023.118510⟩ Glacial geomorphology ice sheets continuum bed deformation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2024 ftccsdartic https://doi.org/10.1016/j.epsl.2023.118510 2024-01-20T23:50:22Z International audience Subglacial bedforms are relevant geomorphic markers for palaeo-glaciological reconstructions. Due to the complexity of thermomechanical interactions between ice, till and water on subglacial beds, their formation processes and significance in palaeo-glaciology are still controversial. Based on the measurement and comparison of morphometric characteristics (length, width, amplitude, area and volume) of ~250 000 bedforms formed below terrestrial ice sheets during the last glacial period, we propose a unified kinematic model, consistent with the 'bed deformation model', whereby bedform shapes and orientations depend on their degree of evolution and reflect the magnitude and orientation of finite bed deformation in response to motion of the overlying ice. Two application examples from the Low Land Ice Dome (British-Irish Ice Sheet) and Keewatin Ice Dome (Laurentide Ice Sheet) demonstrate how this model enables the derivation of palaeo-glaciological maps of finite bed deformation, which can then be used to better constrain ice flow directions, their relative velocities, and the location of subglacial drainage routes. Article in Journal/Newspaper Ice Sheet Keewatin Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Earth and Planetary Science Letters 626 118510 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Glacial geomorphology ice sheets continuum bed deformation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
Glacial geomorphology ice sheets continuum bed deformation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Vérité, Jean Ravier, Édouard Bourgeois, Olivier Pochat, Stéphane Bessin, Paul The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions |
topic_facet |
Glacial geomorphology ice sheets continuum bed deformation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Subglacial bedforms are relevant geomorphic markers for palaeo-glaciological reconstructions. Due to the complexity of thermomechanical interactions between ice, till and water on subglacial beds, their formation processes and significance in palaeo-glaciology are still controversial. Based on the measurement and comparison of morphometric characteristics (length, width, amplitude, area and volume) of ~250 000 bedforms formed below terrestrial ice sheets during the last glacial period, we propose a unified kinematic model, consistent with the 'bed deformation model', whereby bedform shapes and orientations depend on their degree of evolution and reflect the magnitude and orientation of finite bed deformation in response to motion of the overlying ice. Two application examples from the Low Land Ice Dome (British-Irish Ice Sheet) and Keewatin Ice Dome (Laurentide Ice Sheet) demonstrate how this model enables the derivation of palaeo-glaciological maps of finite bed deformation, which can then be used to better constrain ice flow directions, their relative velocities, and the location of subglacial drainage routes. |
author2 |
Laboratoire de Planétologie et Géosciences - Le Mans (LPG - Le Mans) Laboratoire de Planétologie et Géosciences UMR_C 6112 (LPG) Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) |
format |
Article in Journal/Newspaper |
author |
Vérité, Jean Ravier, Édouard Bourgeois, Olivier Pochat, Stéphane Bessin, Paul |
author_facet |
Vérité, Jean Ravier, Édouard Bourgeois, Olivier Pochat, Stéphane Bessin, Paul |
author_sort |
Vérité, Jean |
title |
The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions |
title_short |
The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions |
title_full |
The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions |
title_fullStr |
The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions |
title_full_unstemmed |
The kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions |
title_sort |
kinematic significance of subglacial bedforms and their use in palaeo-glaciological reconstructions |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.science/hal-04331995 https://hal.science/hal-04331995/document https://hal.science/hal-04331995/file/Verite_al_2024_Kinematic_significance_of_subglacial_bedforms.pdf https://doi.org/10.1016/j.epsl.2023.118510 |
genre |
Ice Sheet Keewatin |
genre_facet |
Ice Sheet Keewatin |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-04331995 Earth and Planetary Science Letters, 2024, 626, pp.118510. ⟨10.1016/j.epsl.2023.118510⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2023.118510 hal-04331995 https://hal.science/hal-04331995 https://hal.science/hal-04331995/document https://hal.science/hal-04331995/file/Verite_al_2024_Kinematic_significance_of_subglacial_bedforms.pdf doi:10.1016/j.epsl.2023.118510 |
op_doi |
https://doi.org/10.1016/j.epsl.2023.118510 |
container_title |
Earth and Planetary Science Letters |
container_volume |
626 |
container_start_page |
118510 |
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1790601601393623040 |