Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry
International audience Getz Ice Shelf, the largest producer of ice shelf meltwater in Antarctica, buttresses glaciers that hold enough ice to raise sea level by 22 cm. We present a new bathymetry of its sub‐ice shelf cavity using a three‐dimensional inversion of airborne gravity data constrained by...
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Online Access: | https://hal.science/hal-03026251 https://hal.science/hal-03026251/document https://hal.science/hal-03026251/file/2019GL086522.pdf https://doi.org/10.1029/2019GL086522 |
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ftunivnantes:oai:HAL:hal-03026251v1 2023-05-15T13:35:39+02:00 Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry Millan, Romain St‐laurent, Pierre Rignot, Eric Morlighem, Mathieu Mouginot, Jeremie Scheuchl, Bernd 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) 2020-07-16 https://hal.science/hal-03026251 https://hal.science/hal-03026251/document https://hal.science/hal-03026251/file/2019GL086522.pdf https://doi.org/10.1029/2019GL086522 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2019GL086522 hal-03026251 https://hal.science/hal-03026251 https://hal.science/hal-03026251/document https://hal.science/hal-03026251/file/2019GL086522.pdf doi:10.1029/2019GL086522 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-03026251 Geophysical Research Letters, 2020, 47 (13), ⟨10.1029/2019GL086522⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.1029/2019GL086522 2023-03-01T02:34:17Z International audience Getz Ice Shelf, the largest producer of ice shelf meltwater in Antarctica, buttresses glaciers that hold enough ice to raise sea level by 22 cm. We present a new bathymetry of its sub‐ice shelf cavity using a three‐dimensional inversion of airborne gravity data constrained by multibeam bathymetry at sea and a reconstruction of the bedrock from mass conservation on land. The new bathymetry is deeper than previously estimated with differences exceeding 500 m in a number of regions. When incorporated into an ocean model, it yields a better description of the spatial distribution of ice shelf melt, specifically along glacier grounding lines. While the melt intensity is overestimated because of a positive bias in ocean thermal forcing, the study reveals the main pathways along which warm oceanic water enters the cavity and corroborates the observed rapid retreat of Berry Glacier along a deep channel with a retrograde bed slope. Article in Journal/Newspaper Antarc* Antarctica Berry Glacier Getz Ice Shelf Ice Shelf Université de Nantes: HAL-UNIV-NANTES Berry Glacier ENVELOPE(-134.000,-134.000,-75.000,-75.000) Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) Getz Ice Shelf ENVELOPE(-126.500,-126.500,-74.250,-74.250) Geophysical Research Letters 47 13 |
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Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Millan, Romain St‐laurent, Pierre Rignot, Eric Morlighem, Mathieu Mouginot, Jeremie Scheuchl, Bernd Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Getz Ice Shelf, the largest producer of ice shelf meltwater in Antarctica, buttresses glaciers that hold enough ice to raise sea level by 22 cm. We present a new bathymetry of its sub‐ice shelf cavity using a three‐dimensional inversion of airborne gravity data constrained by multibeam bathymetry at sea and a reconstruction of the bedrock from mass conservation on land. The new bathymetry is deeper than previously estimated with differences exceeding 500 m in a number of regions. When incorporated into an ocean model, it yields a better description of the spatial distribution of ice shelf melt, specifically along glacier grounding lines. While the melt intensity is overestimated because of a positive bias in ocean thermal forcing, the study reveals the main pathways along which warm oceanic water enters the cavity and corroborates the observed rapid retreat of Berry Glacier along a deep channel with a retrograde bed slope. |
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 |
Millan, Romain St‐laurent, Pierre Rignot, Eric Morlighem, Mathieu Mouginot, Jeremie Scheuchl, Bernd |
author_facet |
Millan, Romain St‐laurent, Pierre Rignot, Eric Morlighem, Mathieu Mouginot, Jeremie Scheuchl, Bernd |
author_sort |
Millan, Romain |
title |
Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry |
title_short |
Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry |
title_full |
Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry |
title_fullStr |
Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry |
title_full_unstemmed |
Constraining an Ocean Model Under Getz Ice Shelf, Antarctica, Using A Gravity‐Derived Bathymetry |
title_sort |
constraining an ocean model under getz ice shelf, antarctica, using a gravity‐derived bathymetry |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03026251 https://hal.science/hal-03026251/document https://hal.science/hal-03026251/file/2019GL086522.pdf https://doi.org/10.1029/2019GL086522 |
long_lat |
ENVELOPE(-134.000,-134.000,-75.000,-75.000) ENVELOPE(-145.217,-145.217,-76.550,-76.550) ENVELOPE(-126.500,-126.500,-74.250,-74.250) |
geographic |
Berry Glacier Getz Getz Ice Shelf |
geographic_facet |
Berry Glacier Getz Getz Ice Shelf |
genre |
Antarc* Antarctica Berry Glacier Getz Ice Shelf Ice Shelf |
genre_facet |
Antarc* Antarctica Berry Glacier Getz Ice Shelf Ice Shelf |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-03026251 Geophysical Research Letters, 2020, 47 (13), ⟨10.1029/2019GL086522⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019GL086522 hal-03026251 https://hal.science/hal-03026251 https://hal.science/hal-03026251/document https://hal.science/hal-03026251/file/2019GL086522.pdf doi:10.1029/2019GL086522 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019GL086522 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
13 |
_version_ |
1766068485044043776 |