Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet
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 sub...
Published in: | Nature Geoscience |
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Online Access: | https://epic.awi.de/id/eprint/50703/ https://epic.awi.de/id/eprint/50703/1/Morlighem_etal_2019_NatGeosc_BedMachine_published_s41561-019-0510-8.pdf https://doi.org/10.1038/s41561-019-0510-8 https://hdl.handle.net/10013/epic.4e481a2c-cfab-47f1-843a-27ddc0d83ae0 |
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ftawi:oai:epic.awi.de:50703 2024-09-15T17:44:41+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 S. Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma C. Steinhage, Daniel Sun, Bo Broeke, Michiel R. van den Ommen, Tas D. van Wessem, Melchior van Young, Duncan A. 2020-02-12 application/pdf https://epic.awi.de/id/eprint/50703/ https://epic.awi.de/id/eprint/50703/1/Morlighem_etal_2019_NatGeosc_BedMachine_published_s41561-019-0510-8.pdf https://doi.org/10.1038/s41561-019-0510-8 https://hdl.handle.net/10013/epic.4e481a2c-cfab-47f1-843a-27ddc0d83ae0 unknown https://epic.awi.de/id/eprint/50703/1/Morlighem_etal_2019_NatGeosc_BedMachine_published_s41561-019-0510-8.pdf Morlighem, M. , Rignot, E. , Binder, T. , Blankenship, D. , Drews, R. , Eagles, G. orcid:0000-0001-5325-0810 , Eisen, O. orcid:0000-0002-6380-962X , Ferraccioli, F. , Forsberg, R. , Fretwell, P. , Goel, V. , Greenbaum, J. S. , Gudmundsson, H. , Guo, J. , Helm, V. orcid:0000-0001-7788-9328 , Hofstede, C. orcid:0000-0002-6015-6918 , Howat, I. , Humbert, A. , Jokat, W. orcid:0000-0002-7793-5854 , Karlsson, N. B. , Lee, W. S. , Matsuoka, K. , Millan, R. , Mouginot, J. , Paden, J. , Pattyn, F. , Roberts, J. , Rosier, S. , Ruppel, A. , Seroussi, H. , Smith, E. C. orcid:0000-0002-8672-8259 , Steinhage, D. orcid:0000-0003-4737-9751 , Sun, B. , Broeke, M. R. v. d. , Ommen, T. D. v. , Wessem, M. v. and Young, D. A. (2020) Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet , Nature Geoscience, 13 , pp. 132-137 . doi:10.1038/s41561-019-0510-8 <https://doi.org/10.1038/s41561-019-0510-8> , hdl:10013/epic.4e481a2c-cfab-47f1-843a-27ddc0d83ae0 EPIC3Nature Geoscience, 13, pp. 132-137, ISSN: 1752-0894 Article isiRev 2020 ftawi https://doi.org/10.1038/s41561-019-0510-8 2024-06-24T04:23:24Z 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Nature Geoscience 13 2 132 137 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
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. |
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 S. Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma C. Steinhage, Daniel Sun, Bo Broeke, Michiel R. van den Ommen, Tas D. van Wessem, Melchior van Young, Duncan A. |
spellingShingle |
Morlighem, Mathieu Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin S. Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma C. Steinhage, Daniel Sun, Bo Broeke, Michiel R. van den Ommen, Tas D. van Wessem, Melchior van Young, Duncan A. Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
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 S. Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, Angelika Jokat, Wilfried Karlsson, Nanna B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma C. Steinhage, Daniel Sun, Bo Broeke, Michiel R. van den Ommen, Tas D. van Wessem, Melchior van Young, Duncan A. |
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 |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/50703/ https://epic.awi.de/id/eprint/50703/1/Morlighem_etal_2019_NatGeosc_BedMachine_published_s41561-019-0510-8.pdf https://doi.org/10.1038/s41561-019-0510-8 https://hdl.handle.net/10013/epic.4e481a2c-cfab-47f1-843a-27ddc0d83ae0 |
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 |
EPIC3Nature Geoscience, 13, pp. 132-137, ISSN: 1752-0894 |
op_relation |
https://epic.awi.de/id/eprint/50703/1/Morlighem_etal_2019_NatGeosc_BedMachine_published_s41561-019-0510-8.pdf Morlighem, M. , Rignot, E. , Binder, T. , Blankenship, D. , Drews, R. , Eagles, G. orcid:0000-0001-5325-0810 , Eisen, O. orcid:0000-0002-6380-962X , Ferraccioli, F. , Forsberg, R. , Fretwell, P. , Goel, V. , Greenbaum, J. S. , Gudmundsson, H. , Guo, J. , Helm, V. orcid:0000-0001-7788-9328 , Hofstede, C. orcid:0000-0002-6015-6918 , Howat, I. , Humbert, A. , Jokat, W. orcid:0000-0002-7793-5854 , Karlsson, N. B. , Lee, W. S. , Matsuoka, K. , Millan, R. , Mouginot, J. , Paden, J. , Pattyn, F. , Roberts, J. , Rosier, S. , Ruppel, A. , Seroussi, H. , Smith, E. C. orcid:0000-0002-8672-8259 , Steinhage, D. orcid:0000-0003-4737-9751 , Sun, B. , Broeke, M. R. v. d. , Ommen, T. D. v. , Wessem, M. v. and Young, D. A. (2020) Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet , Nature Geoscience, 13 , pp. 132-137 . doi:10.1038/s41561-019-0510-8 <https://doi.org/10.1038/s41561-019-0510-8> , hdl:10013/epic.4e481a2c-cfab-47f1-843a-27ddc0d83ae0 |
op_doi |
https://doi.org/10.1038/s41561-019-0510-8 |
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Nature Geoscience |
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