Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps
International audience Rock glaciers are creeping bodies of ice and rock that account for an important part of the mountain cryosphere. In this study, we investigated long-term changes of the Laurichard rock glacier (French Alps), to understand how this rock glacier is responding to climate change....
Published in: | Journal of Geophysical Research: Earth Surface |
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Online Access: | https://hal.science/hal-03356405 https://hal.science/hal-03356405/document https://hal.science/hal-03356405/file/2021JF006161.pdf https://doi.org/10.1029/2021JF006161 |
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ftunivsavoie:oai:HAL:hal-03356405v1 2024-04-28T08:23:49+00:00 Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps Cusicanqui, Diego Rabatel, Antoine Vincent, Christian Bodin, Xavier Thibert, Emmanuel Francou, Bernard Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 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) 2021-09 https://hal.science/hal-03356405 https://hal.science/hal-03356405/document https://hal.science/hal-03356405/file/2021JF006161.pdf https://doi.org/10.1029/2021JF006161 en eng HAL CCSD American Geophysical Union/Wiley info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JF006161 hal-03356405 https://hal.science/hal-03356405 https://hal.science/hal-03356405/document https://hal.science/hal-03356405/file/2021JF006161.pdf doi:10.1029/2021JF006161 WOS: 000702256600007 http://creativecommons.org/licenses/by-nc-sa/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-03356405 Journal of Geophysical Research: Earth Surface, 2021, 126 (9), pp.e2021JF006161. ⟨10.1029/2021JF006161⟩ rock glacier mountain permafrost volume changes rock glacier displacements photogrammetry [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography info:eu-repo/semantics/article Journal articles 2021 ftunivsavoie https://doi.org/10.1029/2021JF006161 2024-04-11T00:39:17Z International audience Rock glaciers are creeping bodies of ice and rock that account for an important part of the mountain cryosphere. In this study, we investigated long-term changes of the Laurichard rock glacier (French Alps), to understand how this rock glacier is responding to climate change. Using feature-tracking and photogrammetric measurements between 1952 and 2019, we quantified changes in thickness, flow velocities and from which we derived the ice/rock flux of the rock glacier at a decadal time scale. This is the first time that emergence velocity and surface mass balance changes have been reconstructed for a rock glacier. Our results reveal a very small surface mass balance ranging from -0.1 m a(-1) to +0.05 m a(-1), reflecting the role of debris in damping the melt rate of the underlying ice. Surprisingly, we found a more negative surface mass balance in the upper part than in the lower part of the rock glacier during the 1952-1971 cold period, likely due to a reduction in rock and snow mass accumulation. Our study shows that thickness changes are mainly driven by changes in surface mass balance except during the most recent period in the lower part of the rock glacier, which was also influenced by a compressive flow related to a protrusion that prevented the rock glacier from advancing. We conclude that the period 1994-2019 witnessed a marked acceleration in rock glacier flow, in agreement with the observations of other rock glaciers in the European Alps. This strong increase in surface speed is likely a consequence of changes in the basal conditions. Article in Journal/Newspaper Ice permafrost Université Savoie Mont Blanc: HAL Journal of Geophysical Research: Earth Surface 126 9 |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
English |
topic |
rock glacier mountain permafrost volume changes rock glacier displacements photogrammetry [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography |
spellingShingle |
rock glacier mountain permafrost volume changes rock glacier displacements photogrammetry [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography Cusicanqui, Diego Rabatel, Antoine Vincent, Christian Bodin, Xavier Thibert, Emmanuel Francou, Bernard Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps |
topic_facet |
rock glacier mountain permafrost volume changes rock glacier displacements photogrammetry [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography |
description |
International audience Rock glaciers are creeping bodies of ice and rock that account for an important part of the mountain cryosphere. In this study, we investigated long-term changes of the Laurichard rock glacier (French Alps), to understand how this rock glacier is responding to climate change. Using feature-tracking and photogrammetric measurements between 1952 and 2019, we quantified changes in thickness, flow velocities and from which we derived the ice/rock flux of the rock glacier at a decadal time scale. This is the first time that emergence velocity and surface mass balance changes have been reconstructed for a rock glacier. Our results reveal a very small surface mass balance ranging from -0.1 m a(-1) to +0.05 m a(-1), reflecting the role of debris in damping the melt rate of the underlying ice. Surprisingly, we found a more negative surface mass balance in the upper part than in the lower part of the rock glacier during the 1952-1971 cold period, likely due to a reduction in rock and snow mass accumulation. Our study shows that thickness changes are mainly driven by changes in surface mass balance except during the most recent period in the lower part of the rock glacier, which was also influenced by a compressive flow related to a protrusion that prevented the rock glacier from advancing. We conclude that the period 1994-2019 witnessed a marked acceleration in rock glacier flow, in agreement with the observations of other rock glaciers in the European Alps. This strong increase in surface speed is likely a consequence of changes in the basal conditions. |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 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) |
format |
Article in Journal/Newspaper |
author |
Cusicanqui, Diego Rabatel, Antoine Vincent, Christian Bodin, Xavier Thibert, Emmanuel Francou, Bernard |
author_facet |
Cusicanqui, Diego Rabatel, Antoine Vincent, Christian Bodin, Xavier Thibert, Emmanuel Francou, Bernard |
author_sort |
Cusicanqui, Diego |
title |
Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps |
title_short |
Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps |
title_full |
Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps |
title_fullStr |
Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps |
title_full_unstemmed |
Interpretation of Volume and Flux Changes of the Laurichard Rock Glacier Between 1952 and 2019, French Alps |
title_sort |
interpretation of volume and flux changes of the laurichard rock glacier between 1952 and 2019, french alps |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03356405 https://hal.science/hal-03356405/document https://hal.science/hal-03356405/file/2021JF006161.pdf https://doi.org/10.1029/2021JF006161 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-03356405 Journal of Geophysical Research: Earth Surface, 2021, 126 (9), pp.e2021JF006161. ⟨10.1029/2021JF006161⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JF006161 hal-03356405 https://hal.science/hal-03356405 https://hal.science/hal-03356405/document https://hal.science/hal-03356405/file/2021JF006161.pdf doi:10.1029/2021JF006161 WOS: 000702256600007 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021JF006161 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
9 |
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1797584491473010688 |