Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area
International audience The subglacial observatory beneath the Argentiere glacier provides a rare opportunity to study the interactions between glacier sliding velocity and subglacial runoff. The sliding velocity has been monitored in this cavity almost continuously since 1997 and the resulting data...
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fttriple:oai:gotriple.eu:10670/1.i8q8ai 2023-05-15T16:57:27+02:00 Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area Vincent, Christian Moreau, Luc Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ) 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 Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-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 Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) https://hal.archives-ouvertes.fr/hal-02009228/file/sliding-velocity-fluctuations-and-subglacial-hydrology-over-the-last-two-decades-on-argentiere-glacier-mont-blanc-area.pdf https://hal.archives-ouvertes.fr/hal-02009228 en eng HAL CCSD International Glaciological Society hal-02009228 10670/1.i8q8ai https://hal.archives-ouvertes.fr/hal-02009228/file/sliding-velocity-fluctuations-and-subglacial-hydrology-over-the-last-two-decades-on-argentiere-glacier-mont-blanc-area.pdf https://hal.archives-ouvertes.fr/hal-02009228 lic_creative-commons Archive Ouverte d'INRAE ISSN: 0022-1430 Journal of Glaciology Journal of Glaciology, International Glaciological Society, 2016, 62 (235), pp.805-815 geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ fttriple 2023-01-22T17:27:56Z International audience The subglacial observatory beneath the Argentiere glacier provides a rare opportunity to study the interactions between glacier sliding velocity and subglacial runoff. The sliding velocity has been monitored in this cavity almost continuously since 1997 and the resulting data indicate a decrease in annual sliding velocities over the last two decades. We found close relationships between annual surface velocity, sliding velocity and ice thickness. These relationships indicate that the ice-flow velocity changes do not depend on subglacial water runoff changes at the annual timescale. The seasonal magnitudes of sliding also show a decrease over the last two decades. At the seasonal timescale, sliding velocity increases before or simultaneously with the large runoff increase in May, indicating a distributed drainage system. Conversely, at the end of the melt season, sliding velocity continues to decrease after the runoff returns to low winter values. The simultaneous increases of runoff and sliding velocity occur mainly before the spring transition. Later, sliding velocity generally appears not to be related to water inputs coming from the surface, except for some large accelerations after midAugust that are always associated with periods of rapidly increasing water inputs to the subglacial drainage system. Article in Journal/Newspaper Journal of Glaciology Unknown Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) |
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fttriple |
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English |
topic |
geo envir |
spellingShingle |
geo envir Vincent, Christian Moreau, Luc Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area |
topic_facet |
geo envir |
description |
International audience The subglacial observatory beneath the Argentiere glacier provides a rare opportunity to study the interactions between glacier sliding velocity and subglacial runoff. The sliding velocity has been monitored in this cavity almost continuously since 1997 and the resulting data indicate a decrease in annual sliding velocities over the last two decades. We found close relationships between annual surface velocity, sliding velocity and ice thickness. These relationships indicate that the ice-flow velocity changes do not depend on subglacial water runoff changes at the annual timescale. The seasonal magnitudes of sliding also show a decrease over the last two decades. At the seasonal timescale, sliding velocity increases before or simultaneously with the large runoff increase in May, indicating a distributed drainage system. Conversely, at the end of the melt season, sliding velocity continues to decrease after the runoff returns to low winter values. The simultaneous increases of runoff and sliding velocity occur mainly before the spring transition. Later, sliding velocity generally appears not to be related to water inputs coming from the surface, except for some large accelerations after midAugust that are always associated with periods of rapidly increasing water inputs to the subglacial drainage system. |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ) 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 Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-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 Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) |
format |
Article in Journal/Newspaper |
author |
Vincent, Christian Moreau, Luc |
author_facet |
Vincent, Christian Moreau, Luc |
author_sort |
Vincent, Christian |
title |
Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area |
title_short |
Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area |
title_full |
Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area |
title_fullStr |
Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area |
title_full_unstemmed |
Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area |
title_sort |
sliding velocity fluctuations and subglacial hydrology over the last two decades on argentière glacier, mont blanc area |
publisher |
HAL CCSD |
url |
https://hal.archives-ouvertes.fr/hal-02009228/file/sliding-velocity-fluctuations-and-subglacial-hydrology-over-the-last-two-decades-on-argentiere-glacier-mont-blanc-area.pdf https://hal.archives-ouvertes.fr/hal-02009228 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Mont Blanc |
geographic_facet |
Mont Blanc |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Archive Ouverte d'INRAE ISSN: 0022-1430 Journal of Glaciology Journal of Glaciology, International Glaciological Society, 2016, 62 (235), pp.805-815 |
op_relation |
hal-02009228 10670/1.i8q8ai https://hal.archives-ouvertes.fr/hal-02009228/file/sliding-velocity-fluctuations-and-subglacial-hydrology-over-the-last-two-decades-on-argentiere-glacier-mont-blanc-area.pdf https://hal.archives-ouvertes.fr/hal-02009228 |
op_rights |
lic_creative-commons |
_version_ |
1766049008142254080 |