Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data
International audience Denman Glacier, East Antarctica, holds an ice volume equivalent to a 1.5 m rise in global sea level. Using satellite radar interferometry from the COSMO‐SkyMed constellation, we detect a 5.4 ± 0.3 km grounding line retreat between 1996 and 2017–2018. A novel reconstruction of...
Published in: | Geophysical Research Letters |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-03026293 https://hal.science/hal-03026293/document https://hal.science/hal-03026293/file/2019GL086291.pdf https://doi.org/10.1029/2019GL086291 |
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ftunivnantes:oai:HAL:hal-03026293v1 2023-05-15T13:35:39+02:00 Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data Brancato, V. Rignot, E. Milillo, P. Morlighem, M. Mouginot, J. An, L. Scheuchl, B. Jeong, S. Rizzoli, P. Bueso bello, J. Prats‐iraola, P. 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) 2020-04-16 https://hal.science/hal-03026293 https://hal.science/hal-03026293/document https://hal.science/hal-03026293/file/2019GL086291.pdf https://doi.org/10.1029/2019GL086291 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2019GL086291 hal-03026293 https://hal.science/hal-03026293 https://hal.science/hal-03026293/document https://hal.science/hal-03026293/file/2019GL086291.pdf doi:10.1029/2019GL086291 http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess CC-BY-ND ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-03026293 Geophysical Research Letters, 2020, 47 (7), ⟨10.1029/2019GL086291⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.1029/2019GL086291 2023-03-01T02:34:17Z International audience Denman Glacier, East Antarctica, holds an ice volume equivalent to a 1.5 m rise in global sea level. Using satellite radar interferometry from the COSMO‐SkyMed constellation, we detect a 5.4 ± 0.3 km grounding line retreat between 1996 and 2017–2018. A novel reconstruction of the glacier bed topography indicates that the retreat proceeds on the western flank along a previously unknown 5 km wide, 1,800 m deep trough, deepening to 3,400 m below sea level. On the eastern flank, the grounding line is stabilized by a 10 km wide ridge. At tidal frequencies, the grounding line extends over a several kilometer‐wide grounding zone, enabling warm ocean water to melt ice at critical locations for glacier stability. If warm, modified Circumpolar Deep Water reaches the sub‐ice‐shelf cavity and continues to melt ice at a rate exceeding balance conditions, the potential exists for Denman Glacier to retreat irreversibly into the deepest, marine‐based basin in Antarctica. Article in Journal/Newspaper Antarc* Antarctica Denman Glacier East Antarctica Ice Shelf Université de Nantes: HAL-UNIV-NANTES Denman Glacier ENVELOPE(99.417,99.417,-66.750,-66.750) East Antarctica Geophysical Research Letters 47 7 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Brancato, V. Rignot, E. Milillo, P. Morlighem, M. Mouginot, J. An, L. Scheuchl, B. Jeong, S. Rizzoli, P. Bueso bello, J. Prats‐iraola, P. Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Denman Glacier, East Antarctica, holds an ice volume equivalent to a 1.5 m rise in global sea level. Using satellite radar interferometry from the COSMO‐SkyMed constellation, we detect a 5.4 ± 0.3 km grounding line retreat between 1996 and 2017–2018. A novel reconstruction of the glacier bed topography indicates that the retreat proceeds on the western flank along a previously unknown 5 km wide, 1,800 m deep trough, deepening to 3,400 m below sea level. On the eastern flank, the grounding line is stabilized by a 10 km wide ridge. At tidal frequencies, the grounding line extends over a several kilometer‐wide grounding zone, enabling warm ocean water to melt ice at critical locations for glacier stability. If warm, modified Circumpolar Deep Water reaches the sub‐ice‐shelf cavity and continues to melt ice at a rate exceeding balance conditions, the potential exists for Denman Glacier to retreat irreversibly into the deepest, marine‐based basin in Antarctica. |
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) |
format |
Article in Journal/Newspaper |
author |
Brancato, V. Rignot, E. Milillo, P. Morlighem, M. Mouginot, J. An, L. Scheuchl, B. Jeong, S. Rizzoli, P. Bueso bello, J. Prats‐iraola, P. |
author_facet |
Brancato, V. Rignot, E. Milillo, P. Morlighem, M. Mouginot, J. An, L. Scheuchl, B. Jeong, S. Rizzoli, P. Bueso bello, J. Prats‐iraola, P. |
author_sort |
Brancato, V. |
title |
Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data |
title_short |
Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data |
title_full |
Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data |
title_fullStr |
Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data |
title_full_unstemmed |
Grounding Line Retreat of Denman Glacier, East Antarctica, Measured With COSMO‐SkyMed Radar Interferometry Data |
title_sort |
grounding line retreat of denman glacier, east antarctica, measured with cosmo‐skymed radar interferometry data |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03026293 https://hal.science/hal-03026293/document https://hal.science/hal-03026293/file/2019GL086291.pdf https://doi.org/10.1029/2019GL086291 |
long_lat |
ENVELOPE(99.417,99.417,-66.750,-66.750) |
geographic |
Denman Glacier East Antarctica |
geographic_facet |
Denman Glacier East Antarctica |
genre |
Antarc* Antarctica Denman Glacier East Antarctica Ice Shelf |
genre_facet |
Antarc* Antarctica Denman Glacier East Antarctica Ice Shelf |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-03026293 Geophysical Research Letters, 2020, 47 (7), ⟨10.1029/2019GL086291⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019GL086291 hal-03026293 https://hal.science/hal-03026293 https://hal.science/hal-03026293/document https://hal.science/hal-03026293/file/2019GL086291.pdf doi:10.1029/2019GL086291 |
op_rights |
http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess |
op_rightsnorm |
CC-BY-ND |
op_doi |
https://doi.org/10.1029/2019GL086291 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
7 |
_version_ |
1766068487006978048 |