Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland
International audience Abstract Surface melt forces summertime ice‐flow accelerations on glaciers and ice sheets. Here, we show that large meltwater‐forced accelerations also occur during wintertime in Greenland. We document supraglacial lakes (SGLs) draining in cascades at unusually high elevation,...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.science/hal-04303862 https://hal.science/hal-04303862/document https://hal.science/hal-04303862/file/Maier2023.pdf https://doi.org/10.1029/2022gl102251 |
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ftanrparis:oai:HAL:hal-04303862v1 2024-06-09T07:46:21+00:00 Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland Maier, Nathan Andersen, Jonas, Kvist Mouginot, Jérémie Gimbert, Florent Gagliardini, Olivier 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)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) ANR-19-CE01-0011,SOSIce,Observations spatiales des calottes polaires : changements de masse entre 2013 et maintenant(2019) 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) 2023-02-22 https://hal.science/hal-04303862 https://hal.science/hal-04303862/document https://hal.science/hal-04303862/file/Maier2023.pdf https://doi.org/10.1029/2022gl102251 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2022gl102251 hal-04303862 https://hal.science/hal-04303862 https://hal.science/hal-04303862/document https://hal.science/hal-04303862/file/Maier2023.pdf doi:10.1029/2022gl102251 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-04303862 Geophysical Research Letters, 2023, 50 (4), ⟨10.1029/2022gl102251⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2023 ftanrparis https://doi.org/10.1029/2022gl102251 2024-05-16T14:35:37Z International audience Abstract Surface melt forces summertime ice‐flow accelerations on glaciers and ice sheets. Here, we show that large meltwater‐forced accelerations also occur during wintertime in Greenland. We document supraglacial lakes (SGLs) draining in cascades at unusually high elevation, causing an expansive flow acceleration over a ∼5,200 km 2 region during winter. The three‐component interferometric surface velocity field and decomposition modeling reveal the underlying flood propagation with unprecedented detail as it traveled over 160 km from the drainage site to the margin, providing novel constraints on subglacial water pathways, drainage morphology, and links with basal sliding. The triggering SGLs continuously grew over 40 years and suddenly released decades of stored meltwater, demonstrating surface melting can impact dynamics well beyond melt production. We show these events are likely common and thus their cumulative impact on dynamics should be further evaluated. Article in Journal/Newspaper Greenland Portail HAL-ANR (Agence Nationale de la Recherche) Greenland Geophysical Research Letters 50 4 |
institution |
Open Polar |
collection |
Portail HAL-ANR (Agence Nationale de la Recherche) |
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ftanrparis |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Maier, Nathan Andersen, Jonas, Kvist Mouginot, Jérémie Gimbert, Florent Gagliardini, Olivier Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract Surface melt forces summertime ice‐flow accelerations on glaciers and ice sheets. Here, we show that large meltwater‐forced accelerations also occur during wintertime in Greenland. We document supraglacial lakes (SGLs) draining in cascades at unusually high elevation, causing an expansive flow acceleration over a ∼5,200 km 2 region during winter. The three‐component interferometric surface velocity field and decomposition modeling reveal the underlying flood propagation with unprecedented detail as it traveled over 160 km from the drainage site to the margin, providing novel constraints on subglacial water pathways, drainage morphology, and links with basal sliding. The triggering SGLs continuously grew over 40 years and suddenly released decades of stored meltwater, demonstrating surface melting can impact dynamics well beyond melt production. We show these events are likely common and thus their cumulative impact on dynamics should be further evaluated. |
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)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) ANR-19-CE01-0011,SOSIce,Observations spatiales des calottes polaires : changements de masse entre 2013 et maintenant(2019) 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 Andersen, Jonas, Kvist Mouginot, Jérémie Gimbert, Florent Gagliardini, Olivier |
author_facet |
Maier, Nathan Andersen, Jonas, Kvist Mouginot, Jérémie Gimbert, Florent Gagliardini, Olivier |
author_sort |
Maier, Nathan |
title |
Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland |
title_short |
Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland |
title_full |
Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland |
title_fullStr |
Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland |
title_full_unstemmed |
Wintertime Supraglacial Lake Drainage Cascade Triggers Large‐Scale Ice Flow Response in Greenland |
title_sort |
wintertime supraglacial lake drainage cascade triggers large‐scale ice flow response in greenland |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04303862 https://hal.science/hal-04303862/document https://hal.science/hal-04303862/file/Maier2023.pdf https://doi.org/10.1029/2022gl102251 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-04303862 Geophysical Research Letters, 2023, 50 (4), ⟨10.1029/2022gl102251⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2022gl102251 hal-04303862 https://hal.science/hal-04303862 https://hal.science/hal-04303862/document https://hal.science/hal-04303862/file/Maier2023.pdf doi:10.1029/2022gl102251 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2022gl102251 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
4 |
_version_ |
1801376148294205440 |