Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream
Abstract 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 Iss...
Published in: | Geophysical Research Letters |
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Online Access: | https://doi.org/10.1029/2023GL103240 https://doaj.org/article/6dc846118fab493db28b483b15fb3153 |
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ftdoajarticles:oai:doaj.org/article:6dc846118fab493db28b483b15fb3153 2024-09-15T18:08:51+00:00 Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream J. K. Andersen N. Rathmann C. S. Hvidberg A. Grinsted A. Kusk J. P. Merryman Boncori J. Mouginot 2023-06-01T00:00:00Z https://doi.org/10.1029/2023GL103240 https://doaj.org/article/6dc846118fab493db28b483b15fb3153 EN eng Wiley https://doi.org/10.1029/2023GL103240 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL103240 https://doaj.org/article/6dc846118fab493db28b483b15fb3153 Geophysical Research Letters, Vol 50, Iss 12, Pp n/a-n/a (2023) glaciology Greenland hydrology DInSAR Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2023GL103240 2024-08-05T17:49:23Z Abstract 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 Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 50 12 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
glaciology Greenland hydrology DInSAR Geophysics. Cosmic physics QC801-809 |
spellingShingle |
glaciology Greenland hydrology DInSAR Geophysics. Cosmic physics QC801-809 J. K. Andersen N. Rathmann C. S. Hvidberg A. Grinsted A. Kusk J. P. Merryman Boncori J. Mouginot Episodic Subglacial Drainage Cascades Below the Northeast Greenland Ice Stream |
topic_facet |
glaciology Greenland hydrology DInSAR Geophysics. Cosmic physics QC801-809 |
description |
Abstract 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 |
J. K. Andersen N. Rathmann C. S. Hvidberg A. Grinsted A. Kusk J. P. Merryman Boncori J. Mouginot |
author_facet |
J. K. Andersen N. Rathmann C. S. Hvidberg A. Grinsted A. Kusk J. P. Merryman Boncori J. Mouginot |
author_sort |
J. K. Andersen |
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 |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023GL103240 https://doaj.org/article/6dc846118fab493db28b483b15fb3153 |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Geophysical Research Letters, Vol 50, Iss 12, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2023GL103240 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL103240 https://doaj.org/article/6dc846118fab493db28b483b15fb3153 |
op_doi |
https://doi.org/10.1029/2023GL103240 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
12 |
_version_ |
1810446222044954624 |