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...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/298662 2023-05-15T13:37:30+02:00 Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet Morlighem, M. Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Stevens Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, A. Jokat, Wilfried Karlsson, Nanna N.B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason J.L. Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Rvan Den M.R.v.d. Ommen, Tas Dvan T.D.v. Wessem, Melchior van Young, Duncan D.A. 2019-02-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/298662 https://dipot.ulb.ac.be/dspace/bitstream/2013/298662/3/BedMachinePaper.pdf en eng uri/info:doi/10.1038/s41561-019-0510-8 uri/info:scp/85076510316 https://dipot.ulb.ac.be/dspace/bitstream/2013/298662/3/BedMachinePaper.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/298662 1 full-text file(s): info:eu-repo/semantics/openAccess Nature Geoscience Sciences de la terre et du cosmos info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2019 ftunivbruxelles 2022-06-12T22:09:21Z 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. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier Wilkes Land DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) 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) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences de la terre et du cosmos |
spellingShingle |
Sciences de la terre et du cosmos Morlighem, M. Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Stevens Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, A. Jokat, Wilfried Karlsson, Nanna N.B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason J.L. Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Rvan Den M.R.v.d. Ommen, Tas Dvan T.D.v. Wessem, Melchior van Young, Duncan D.A. Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet |
topic_facet |
Sciences de la terre et du cosmos |
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. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Morlighem, M. Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Stevens Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, A. Jokat, Wilfried Karlsson, Nanna N.B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason J.L. Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Rvan Den M.R.v.d. Ommen, Tas Dvan T.D.v. Wessem, Melchior van Young, Duncan D.A. |
author_facet |
Morlighem, M. Rignot, Eric Binder, Tobias Blankenship, Donald Drews, Reinhard Eagles, Graeme Eisen, Olaf Ferraccioli, Fausto Forsberg, René Fretwell, Peter Goel, Vikram Greenbaum, Jamin Stevens Gudmundsson, Hilmar Guo, Jingxue Helm, Veit Hofstede, Coen Howat, Ian Humbert, A. Jokat, Wilfried Karlsson, Nanna N.B. Lee, Won Sang Matsuoka, Kenichi Millan, Romain Mouginot, Jeremie Paden, John Pattyn, Frank Roberts, Jason J.L. Rosier, Sebastian Ruppel, Antonia Seroussi, Helene Smith, Emma Steinhage, Daniel Sun, Bo Broeke, Michiel Rvan Den M.R.v.d. Ommen, Tas Dvan T.D.v. Wessem, Melchior van Young, Duncan D.A. |
author_sort |
Morlighem, M. |
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 |
2019 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/298662 https://dipot.ulb.ac.be/dspace/bitstream/2013/298662/3/BedMachinePaper.pdf |
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 |
Nature Geoscience |
op_relation |
uri/info:doi/10.1038/s41561-019-0510-8 uri/info:scp/85076510316 https://dipot.ulb.ac.be/dspace/bitstream/2013/298662/3/BedMachinePaper.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/298662 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766092638298046464 |