Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream
Subglacial hydrology can exert an important control on ice flow by affecting friction at the ice-bedrock interface. Here, we report on a series of subglacial drainage events along the Northeast Greenland Ice Stream (NEGIS), initiating as far inland as 500 km from the margin of Zachariae Isstrøm. The...
Published in: | Geophysical Research Letters |
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Main Authors: | , , , , , , |
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2023
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Online Access: | https://orbit.dtu.dk/en/publications/ef168b7f-187a-4c7b-bb05-ef2b77447085 https://doi.org/10.1029/2023GL103240 https://backend.orbit.dtu.dk/ws/files/326406345/Geophysical_Research_Letters_2023_Andersen_Episodic_Subglacial_Drainage_Cascades_Below_the_Northeast_Greenland_Ice.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/ef168b7f-187a-4c7b-bb05-ef2b77447085 2024-09-15T18:09:07+00:00 Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream Andersen, J. K. Rathmann, N. Hvidberg, C. S. Grinsted, A. Kusk, A. Merryman Boncori, J. P. Mouginot, J. 2023 application/pdf https://orbit.dtu.dk/en/publications/ef168b7f-187a-4c7b-bb05-ef2b77447085 https://doi.org/10.1029/2023GL103240 https://backend.orbit.dtu.dk/ws/files/326406345/Geophysical_Research_Letters_2023_Andersen_Episodic_Subglacial_Drainage_Cascades_Below_the_Northeast_Greenland_Ice.pdf eng eng https://orbit.dtu.dk/en/publications/ef168b7f-187a-4c7b-bb05-ef2b77447085 info:eu-repo/semantics/openAccess Andersen , J K , Rathmann , N , Hvidberg , C S , Grinsted , A , Kusk , A , Merryman Boncori , J P & Mouginot , J 2023 , ' Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream ' , Geophysical Research Letters , vol. 50 , no. 12 , e2023GL103240 . https://doi.org/10.1029/2023GL103240 article 2023 ftdtupubl https://doi.org/10.1029/2023GL103240 2024-08-13T00:03:06Z Subglacial hydrology can exert an important control on ice flow by affecting friction at the ice-bedrock interface. Here, we report on a series of subglacial drainage events along the Northeast Greenland Ice Stream (NEGIS), initiating as far inland as 500 km from the margin of Zachariae Isstrøm. The drainage events exhibit local transient uplift, followed by prolonged subsidence, measured by differential satellite synthetic aperture radar interferometry (DInSAR). In downstream regions, drainage events are associated with temporary acceleration in ice flow. The high spatiotemporal resolution of the DInSAR measurements allows for a detailed mapping of the drainage propagation pathway. We show that multiple drainage cascades have occurred along the same pathway over the years 2020–2022. Finally, the propagation speed of subglacial water flow is found to vary greatly along NEGIS, suggesting that fundamental differences could exist in the subglacial environment. Article in Journal/Newspaper Greenland Technical University of Denmark: DTU Orbit Geophysical Research Letters 50 12 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Subglacial hydrology can exert an important control on ice flow by affecting friction at the ice-bedrock interface. Here, we report on a series of subglacial drainage events along the Northeast Greenland Ice Stream (NEGIS), initiating as far inland as 500 km from the margin of Zachariae Isstrøm. The drainage events exhibit local transient uplift, followed by prolonged subsidence, measured by differential satellite synthetic aperture radar interferometry (DInSAR). In downstream regions, drainage events are associated with temporary acceleration in ice flow. The high spatiotemporal resolution of the DInSAR measurements allows for a detailed mapping of the drainage propagation pathway. We show that multiple drainage cascades have occurred along the same pathway over the years 2020–2022. Finally, the propagation speed of subglacial water flow is found to vary greatly along NEGIS, suggesting that fundamental differences could exist in the subglacial environment. |
format |
Article in Journal/Newspaper |
author |
Andersen, J. K. Rathmann, N. Hvidberg, C. S. Grinsted, A. Kusk, A. Merryman Boncori, J. P. Mouginot, J. |
spellingShingle |
Andersen, J. K. Rathmann, N. Hvidberg, C. S. Grinsted, A. Kusk, A. Merryman Boncori, J. P. Mouginot, J. Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream |
author_facet |
Andersen, J. K. Rathmann, N. Hvidberg, C. S. Grinsted, A. Kusk, A. Merryman Boncori, J. P. Mouginot, J. |
author_sort |
Andersen, J. K. |
title |
Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream |
title_short |
Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream |
title_full |
Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream |
title_fullStr |
Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream |
title_full_unstemmed |
Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream |
title_sort |
episodic subglacial drainage cascades below the northeast greenland ice stream |
publishDate |
2023 |
url |
https://orbit.dtu.dk/en/publications/ef168b7f-187a-4c7b-bb05-ef2b77447085 https://doi.org/10.1029/2023GL103240 https://backend.orbit.dtu.dk/ws/files/326406345/Geophysical_Research_Letters_2023_Andersen_Episodic_Subglacial_Drainage_Cascades_Below_the_Northeast_Greenland_Ice.pdf |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Andersen , J K , Rathmann , N , Hvidberg , C S , Grinsted , A , Kusk , A , Merryman Boncori , J P & Mouginot , J 2023 , ' Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream ' , Geophysical Research Letters , vol. 50 , no. 12 , e2023GL103240 . https://doi.org/10.1029/2023GL103240 |
op_relation |
https://orbit.dtu.dk/en/publications/ef168b7f-187a-4c7b-bb05-ef2b77447085 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2023GL103240 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
12 |
_version_ |
1810446519426351104 |