Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet
International audience The Antarctic ice sheet has been losing mass over past decades through the accelerated flow of its glaciers, conditioned by ocean temperature and bed topography. Glaciers retreating along retrograde slopes (that is, the bed elevation drops in the inland direction) are potentia...
Published in: | Nature Geoscience |
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Online Access: | https://hal.science/hal-03025912 https://hal.science/hal-03025912/document https://hal.science/hal-03025912/file/BedMachinePaper.pdf https://doi.org/10.1038/s41561-019-0510-8 |
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ftunigrenoble:oai:HAL:hal-03025912v1 2024-05-12T07:56:10+00:00 Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet Morlighem, Mathieu Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Ommen, Tas Wessem, Melchior Van Young, Duncan Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 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) 2020-02 https://hal.science/hal-03025912 https://hal.science/hal-03025912/document https://hal.science/hal-03025912/file/BedMachinePaper.pdf https://doi.org/10.1038/s41561-019-0510-8 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41561-019-0510-8 hal-03025912 https://hal.science/hal-03025912 https://hal.science/hal-03025912/document https://hal.science/hal-03025912/file/BedMachinePaper.pdf doi:10.1038/s41561-019-0510-8 info:eu-repo/semantics/OpenAccess ISSN: 1752-0894 Nature Geoscience https://hal.science/hal-03025912 Nature Geoscience, 2020, 13 (2), pp.132-137. ⟨10.1038/s41561-019-0510-8⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2020 ftunigrenoble https://doi.org/10.1038/s41561-019-0510-8 2024-04-18T03:12:00Z International audience The Antarctic ice sheet has been losing mass over past decades through the accelerated flow of its glaciers, conditioned by ocean temperature and bed topography. Glaciers retreating along retrograde slopes (that is, the bed elevation drops in the inland direction) are potentially unstable, while subglacial ridges slow down the glacial retreat. Despite major advances in the mapping of subglacial bed topography, significant sectors of Antarctica remain poorly resolved and critical spatial details are missing. Here we present a novel, high-resolution and physically based description of Antarctic bed topography using mass conservation. Our results reveal previously unknown basal features with major implications for glacier response to climate change. For example, glaciers flowing across the Transantarctic Mountains are protected by broad, stabilizing ridges. Conversely, in the marine basin of Wilkes Land, East Antarctica, we find retrograde slopes along Ninnis and Denman glaciers, with stabilizing slopes beneath Moscow University, Totten and Lambert glacier system, despite corrections in bed elevation of up to 1 km for the latter. This transformative description of bed topography redefines the high- and lower-risk sectors for rapid sea level rise from Antarctica; it will also significantly impact model projections of sea level rise from Antarctica in the coming centuries. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier Wilkes Land Université Grenoble Alpes: HAL Antarctic East Antarctica Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) The Antarctic Transantarctic Mountains Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Nature Geoscience 13 2 132 137 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Morlighem, Mathieu Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Ommen, Tas Wessem, Melchior Van Young, Duncan Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The Antarctic ice sheet has been losing mass over past decades through the accelerated flow of its glaciers, conditioned by ocean temperature and bed topography. Glaciers retreating along retrograde slopes (that is, the bed elevation drops in the inland direction) are potentially unstable, while subglacial ridges slow down the glacial retreat. Despite major advances in the mapping of subglacial bed topography, significant sectors of Antarctica remain poorly resolved and critical spatial details are missing. Here we present a novel, high-resolution and physically based description of Antarctic bed topography using mass conservation. Our results reveal previously unknown basal features with major implications for glacier response to climate change. For example, glaciers flowing across the Transantarctic Mountains are protected by broad, stabilizing ridges. Conversely, in the marine basin of Wilkes Land, East Antarctica, we find retrograde slopes along Ninnis and Denman glaciers, with stabilizing slopes beneath Moscow University, Totten and Lambert glacier system, despite corrections in bed elevation of up to 1 km for the latter. This transformative description of bed topography redefines the high- and lower-risk sectors for rapid sea level rise from Antarctica; it will also significantly impact model projections of sea level rise from Antarctica in the coming centuries. |
author2 |
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 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 |
Morlighem, Mathieu Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Ommen, Tas Wessem, Melchior Van Young, Duncan |
author_facet |
Morlighem, Mathieu Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Ommen, Tas Wessem, Melchior Van Young, Duncan |
author_sort |
Morlighem, Mathieu |
title |
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
title_short |
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
title_full |
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
title_fullStr |
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
title_full_unstemmed |
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
title_sort |
deep glacial troughs and stabilizing ridges unveiled beneath the margins of the antarctic ice sheet |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03025912 https://hal.science/hal-03025912/document https://hal.science/hal-03025912/file/BedMachinePaper.pdf https://doi.org/10.1038/s41561-019-0510-8 |
long_lat |
ENVELOPE(67.490,67.490,-73.065,-73.065) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctica Lambert Glacier The Antarctic Transantarctic Mountains Wilkes Land |
geographic_facet |
Antarctic East Antarctica Lambert Glacier The Antarctic Transantarctic Mountains Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier Wilkes Land |
op_source |
ISSN: 1752-0894 Nature Geoscience https://hal.science/hal-03025912 Nature Geoscience, 2020, 13 (2), pp.132-137. ⟨10.1038/s41561-019-0510-8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41561-019-0510-8 hal-03025912 https://hal.science/hal-03025912 https://hal.science/hal-03025912/document https://hal.science/hal-03025912/file/BedMachinePaper.pdf doi:10.1038/s41561-019-0510-8 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41561-019-0510-8 |
container_title |
Nature Geoscience |
container_volume |
13 |
container_issue |
2 |
container_start_page |
132 |
op_container_end_page |
137 |
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1798836129415299072 |