Extensive inland thinning and speed-up of Northeast Greenland Ice Stream
Over the past two decades, ice loss from the Greenland ice sheet (GrIS) has increased owing to enhanced surface melting and ice discharge to the ocean(1–5). Whether continuing increased ice loss will accelerate further, and by how much, remains contentious(6–9). A main contributor to future ice loss...
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ftpubmed:oai:pubmedcentral.nih.gov:9684075 2023-05-15T13:33:20+02:00 Extensive inland thinning and speed-up of Northeast Greenland Ice Stream Khan, Shfaqat A. Choi, Youngmin Morlighem, Mathieu Rignot, Eric Helm, Veit Humbert, Angelika Mouginot, Jérémie Millan, Romain Kjær, Kurt H. Bjørk, Anders A. 2022-11-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9684075/ http://www.ncbi.nlm.nih.gov/pubmed/36352226 https://doi.org/10.1038/s41586-022-05301-z en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9684075/ http://www.ncbi.nlm.nih.gov/pubmed/36352226 http://dx.doi.org/10.1038/s41586-022-05301-z © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Nature Article Text 2022 ftpubmed https://doi.org/10.1038/s41586-022-05301-z 2022-11-27T01:57:39Z Over the past two decades, ice loss from the Greenland ice sheet (GrIS) has increased owing to enhanced surface melting and ice discharge to the ocean(1–5). Whether continuing increased ice loss will accelerate further, and by how much, remains contentious(6–9). A main contributor to future ice loss is the Northeast Greenland Ice Stream (NEGIS), Greenland’s largest basin and a prominent feature of fast-flowing ice that reaches the interior of the GrIS(10–12). Owing to its topographic setting, this sector is vulnerable to rapid retreat, leading to unstable conditions similar to those in the marine-based setting of ice streams in Antarctica(13–20). Here we show that extensive speed-up and thinning triggered by frontal changes in 2012 have already propagated more than 200 km inland. We use unique global navigation satellite system (GNSS) observations, combined with surface elevation changes and surface speeds obtained from satellite data, to select the correct basal conditions to be used in ice flow numerical models, which we then use for future simulations. Our model results indicate that this marine-based sector alone will contribute 13.5–15.5 mm sea-level rise by 2100 (equivalent to the contribution of the entire ice sheet over the past 50 years) and will cause precipitous changes in the coming century. This study shows that measurements of subtle changes in the ice speed and elevation inland help to constrain numerical models of the future mass balance and higher-end projections show better agreement with observations. Text Antarc* Antarctica Greenland Ice Sheet PubMed Central (PMC) Greenland Nature 611 7937 727 732 |
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Article Khan, Shfaqat A. Choi, Youngmin Morlighem, Mathieu Rignot, Eric Helm, Veit Humbert, Angelika Mouginot, Jérémie Millan, Romain Kjær, Kurt H. Bjørk, Anders A. Extensive inland thinning and speed-up of Northeast Greenland Ice Stream |
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Article |
description |
Over the past two decades, ice loss from the Greenland ice sheet (GrIS) has increased owing to enhanced surface melting and ice discharge to the ocean(1–5). Whether continuing increased ice loss will accelerate further, and by how much, remains contentious(6–9). A main contributor to future ice loss is the Northeast Greenland Ice Stream (NEGIS), Greenland’s largest basin and a prominent feature of fast-flowing ice that reaches the interior of the GrIS(10–12). Owing to its topographic setting, this sector is vulnerable to rapid retreat, leading to unstable conditions similar to those in the marine-based setting of ice streams in Antarctica(13–20). Here we show that extensive speed-up and thinning triggered by frontal changes in 2012 have already propagated more than 200 km inland. We use unique global navigation satellite system (GNSS) observations, combined with surface elevation changes and surface speeds obtained from satellite data, to select the correct basal conditions to be used in ice flow numerical models, which we then use for future simulations. Our model results indicate that this marine-based sector alone will contribute 13.5–15.5 mm sea-level rise by 2100 (equivalent to the contribution of the entire ice sheet over the past 50 years) and will cause precipitous changes in the coming century. This study shows that measurements of subtle changes in the ice speed and elevation inland help to constrain numerical models of the future mass balance and higher-end projections show better agreement with observations. |
format |
Text |
author |
Khan, Shfaqat A. Choi, Youngmin Morlighem, Mathieu Rignot, Eric Helm, Veit Humbert, Angelika Mouginot, Jérémie Millan, Romain Kjær, Kurt H. Bjørk, Anders A. |
author_facet |
Khan, Shfaqat A. Choi, Youngmin Morlighem, Mathieu Rignot, Eric Helm, Veit Humbert, Angelika Mouginot, Jérémie Millan, Romain Kjær, Kurt H. Bjørk, Anders A. |
author_sort |
Khan, Shfaqat A. |
title |
Extensive inland thinning and speed-up of Northeast Greenland Ice Stream |
title_short |
Extensive inland thinning and speed-up of Northeast Greenland Ice Stream |
title_full |
Extensive inland thinning and speed-up of Northeast Greenland Ice Stream |
title_fullStr |
Extensive inland thinning and speed-up of Northeast Greenland Ice Stream |
title_full_unstemmed |
Extensive inland thinning and speed-up of Northeast Greenland Ice Stream |
title_sort |
extensive inland thinning and speed-up of northeast greenland ice stream |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9684075/ http://www.ncbi.nlm.nih.gov/pubmed/36352226 https://doi.org/10.1038/s41586-022-05301-z |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctica Greenland Ice Sheet |
op_source |
Nature |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9684075/ http://www.ncbi.nlm.nih.gov/pubmed/36352226 http://dx.doi.org/10.1038/s41586-022-05301-z |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41586-022-05301-z |
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Nature |
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611 |
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7937 |
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727 |
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732 |
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