Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland
Reliable knowledge of ice discharge dynamics for the Greenland ice sheet via its ice streams is essential if we are to understand its stability under future climate scenarios. Currently active ice streams in Greenland have been well mapped using remote-sensing data while past ice-stream paths in wha...
Published in: | Nature Geoscience |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/holocene-icestream-shutdown-and-drainage-basin-reconfiguration-in-northeast-greenland(783a6a33-81d9-42ea-a7e7-921ac29e71c3).html https://doi.org/10.1038/s41561-022-01082-2 https://curis.ku.dk/ws/files/337791220/s41561_022_01082_2.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/783a6a33-81d9-42ea-a7e7-921ac29e71c3 2024-06-09T07:46:17+00:00 Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland Franke, Steven Bons, Paul D. Westhoff, Julien Weikusat, Ilka Binder, Tobias Streng, Kyra Steinhage, Daniel Helm, Veit Eisen, Olaf Paden, John D. Eagles, Graeme Jansen, Daniela 2022-12-05 application/pdf https://curis.ku.dk/portal/da/publications/holocene-icestream-shutdown-and-drainage-basin-reconfiguration-in-northeast-greenland(783a6a33-81d9-42ea-a7e7-921ac29e71c3).html https://doi.org/10.1038/s41561-022-01082-2 https://curis.ku.dk/ws/files/337791220/s41561_022_01082_2.pdf eng eng info:eu-repo/semantics/openAccess Franke , S , Bons , P D , Westhoff , J , Weikusat , I , Binder , T , Streng , K , Steinhage , D , Helm , V , Eisen , O , Paden , J D , Eagles , G & Jansen , D 2022 , ' Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland ' , Nature Geoscience , vol. 15 , no. 12 , pp. 995-1001 . https://doi.org/10.1038/s41561-022-01082-2 FLOW DIRECTION THERMAL STATE SHEET MODEL STRATIGRAPHY SUSTAIN PATCHES FOLDS article 2022 ftcopenhagenunip https://doi.org/10.1038/s41561-022-01082-2 2024-05-16T11:29:28Z Reliable knowledge of ice discharge dynamics for the Greenland ice sheet via its ice streams is essential if we are to understand its stability under future climate scenarios. Currently active ice streams in Greenland have been well mapped using remote-sensing data while past ice-stream paths in what are now deglaciated regions can be reconstructed from the landforms they left behind. However, little is known about possible former and now defunct ice streams in areas still covered by ice. Here we use radio-echo sounding data to decipher the regional ice-flow history of the northeastern Greenland ice sheet on the basis of its internal stratigraphy. By creating a three-dimensional reconstruction of time-equivalent horizons, we map folds deep below the surface that we then attribute to the deformation caused by now-extinct ice streams. We propose that locally this ancient ice-flow regime was much more focused and reached much farther inland than today's and was deactivated when the main drainage system was reconfigured and relocated southwards. The insight that major ice streams in Greenland might start, shift or abruptly disappear will affect future approaches to understanding and modelling the response of Earth's ice sheets to global warming. Article in Journal/Newspaper Greenland Ice Sheet University of Copenhagen: Research Greenland Nature Geoscience 15 12 995 1001 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
FLOW DIRECTION THERMAL STATE SHEET MODEL STRATIGRAPHY SUSTAIN PATCHES FOLDS |
spellingShingle |
FLOW DIRECTION THERMAL STATE SHEET MODEL STRATIGRAPHY SUSTAIN PATCHES FOLDS Franke, Steven Bons, Paul D. Westhoff, Julien Weikusat, Ilka Binder, Tobias Streng, Kyra Steinhage, Daniel Helm, Veit Eisen, Olaf Paden, John D. Eagles, Graeme Jansen, Daniela Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland |
topic_facet |
FLOW DIRECTION THERMAL STATE SHEET MODEL STRATIGRAPHY SUSTAIN PATCHES FOLDS |
description |
Reliable knowledge of ice discharge dynamics for the Greenland ice sheet via its ice streams is essential if we are to understand its stability under future climate scenarios. Currently active ice streams in Greenland have been well mapped using remote-sensing data while past ice-stream paths in what are now deglaciated regions can be reconstructed from the landforms they left behind. However, little is known about possible former and now defunct ice streams in areas still covered by ice. Here we use radio-echo sounding data to decipher the regional ice-flow history of the northeastern Greenland ice sheet on the basis of its internal stratigraphy. By creating a three-dimensional reconstruction of time-equivalent horizons, we map folds deep below the surface that we then attribute to the deformation caused by now-extinct ice streams. We propose that locally this ancient ice-flow regime was much more focused and reached much farther inland than today's and was deactivated when the main drainage system was reconfigured and relocated southwards. The insight that major ice streams in Greenland might start, shift or abruptly disappear will affect future approaches to understanding and modelling the response of Earth's ice sheets to global warming. |
format |
Article in Journal/Newspaper |
author |
Franke, Steven Bons, Paul D. Westhoff, Julien Weikusat, Ilka Binder, Tobias Streng, Kyra Steinhage, Daniel Helm, Veit Eisen, Olaf Paden, John D. Eagles, Graeme Jansen, Daniela |
author_facet |
Franke, Steven Bons, Paul D. Westhoff, Julien Weikusat, Ilka Binder, Tobias Streng, Kyra Steinhage, Daniel Helm, Veit Eisen, Olaf Paden, John D. Eagles, Graeme Jansen, Daniela |
author_sort |
Franke, Steven |
title |
Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland |
title_short |
Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland |
title_full |
Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland |
title_fullStr |
Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland |
title_full_unstemmed |
Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland |
title_sort |
holocene ice-stream shutdown and drainage basin reconfiguration in northeast greenland |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/holocene-icestream-shutdown-and-drainage-basin-reconfiguration-in-northeast-greenland(783a6a33-81d9-42ea-a7e7-921ac29e71c3).html https://doi.org/10.1038/s41561-022-01082-2 https://curis.ku.dk/ws/files/337791220/s41561_022_01082_2.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Franke , S , Bons , P D , Westhoff , J , Weikusat , I , Binder , T , Streng , K , Steinhage , D , Helm , V , Eisen , O , Paden , J D , Eagles , G & Jansen , D 2022 , ' Holocene ice-stream shutdown and drainage basin reconfiguration in northeast Greenland ' , Nature Geoscience , vol. 15 , no. 12 , pp. 995-1001 . https://doi.org/10.1038/s41561-022-01082-2 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41561-022-01082-2 |
container_title |
Nature Geoscience |
container_volume |
15 |
container_issue |
12 |
container_start_page |
995 |
op_container_end_page |
1001 |
_version_ |
1801376061681827840 |