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 1,2,3,4,5 . Whether continuing increased ice loss will accelerate further, and by how much, remains contentious 6,7,8,9 . A main contributor to futur...
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Online Access: | https://orbit.dtu.dk/en/publications/b8adb2b0-d17a-4920-96b8-2391fdf6eccb https://doi.org/10.1038/s41586-022-05301-z https://backend.orbit.dtu.dk/ws/files/298297954/s41586_022_05301_z_1_.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/b8adb2b0-d17a-4920-96b8-2391fdf6eccb 2024-09-15T17:41:02+00:00 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 application/pdf https://orbit.dtu.dk/en/publications/b8adb2b0-d17a-4920-96b8-2391fdf6eccb https://doi.org/10.1038/s41586-022-05301-z https://backend.orbit.dtu.dk/ws/files/298297954/s41586_022_05301_z_1_.pdf eng eng https://orbit.dtu.dk/en/publications/b8adb2b0-d17a-4920-96b8-2391fdf6eccb info:eu-repo/semantics/openAccess Khan , S A , Choi , Y , Morlighem , M , Rignot , E , Helm , V , Humbert , A , Mouginot , J , Millan , R , Kjær , K H & Bjørk , A A 2022 , ' Extensive inland thinning and speed-up of Northeast Greenland Ice Stream ' , Nature , vol. 611 , pp. 727–732 . https://doi.org/10.1038/s41586-022-05301-z /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2022 ftdtupubl https://doi.org/10.1038/s41586-022-05301-z 2024-08-13T00:03:06Z 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 1,2,3,4,5 . Whether continuing increased ice loss will accelerate further, and by how much, remains contentious 6,7,8,9 . 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 10,11,12 . 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 13,14,15,16,17,18,19,20 . 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. Article in Journal/Newspaper Antarc* Antarctica Greenland Ice Sheet Technical University of Denmark: DTU Orbit Nature 611 7937 727 732 |
institution |
Open Polar |
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Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water 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 |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
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 1,2,3,4,5 . Whether continuing increased ice loss will accelerate further, and by how much, remains contentious 6,7,8,9 . 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 10,11,12 . 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 13,14,15,16,17,18,19,20 . 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 |
Article in Journal/Newspaper |
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 |
publishDate |
2022 |
url |
https://orbit.dtu.dk/en/publications/b8adb2b0-d17a-4920-96b8-2391fdf6eccb https://doi.org/10.1038/s41586-022-05301-z https://backend.orbit.dtu.dk/ws/files/298297954/s41586_022_05301_z_1_.pdf |
genre |
Antarc* Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctica Greenland Ice Sheet |
op_source |
Khan , S A , Choi , Y , Morlighem , M , Rignot , E , Helm , V , Humbert , A , Mouginot , J , Millan , R , Kjær , K H & Bjørk , A A 2022 , ' Extensive inland thinning and speed-up of Northeast Greenland Ice Stream ' , Nature , vol. 611 , pp. 727–732 . https://doi.org/10.1038/s41586-022-05301-z |
op_relation |
https://orbit.dtu.dk/en/publications/b8adb2b0-d17a-4920-96b8-2391fdf6eccb |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41586-022-05301-z |
container_title |
Nature |
container_volume |
611 |
container_issue |
7937 |
container_start_page |
727 |
op_container_end_page |
732 |
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1810487110593937408 |