Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology
Abstract Petermann Glacier is a major outlet glacier of northern Greenland that drains a marine‐based basin vulnerable to destabilization from enhanced oceanic and atmospheric forcings. Using satellite radar interferometry data from the Sentinel‐1a/b missions, we observe a seasonal glacier accelerat...
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Online Access: | https://doi.org/10.1029/2022GL098009 https://doaj.org/article/c6c5f8e3989a46339b8b8195b91946fb |
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ftdoajarticles:oai:doaj.org/article:c6c5f8e3989a46339b8b8195b91946fb 2024-09-15T18:07:38+00:00 Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology Shivani Ehrenfeucht Mathieu Morlighem Eric Rignot Christine F. Dow Jeremie Mouginot 2023-01-01T00:00:00Z https://doi.org/10.1029/2022GL098009 https://doaj.org/article/c6c5f8e3989a46339b8b8195b91946fb EN eng Wiley https://doi.org/10.1029/2022GL098009 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL098009 https://doaj.org/article/c6c5f8e3989a46339b8b8195b91946fb Geophysical Research Letters, Vol 50, Iss 1, Pp n/a-n/a (2023) Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2022GL098009 2024-08-05T17:49:23Z Abstract Petermann Glacier is a major outlet glacier of northern Greenland that drains a marine‐based basin vulnerable to destabilization from enhanced oceanic and atmospheric forcings. Using satellite radar interferometry data from the Sentinel‐1a/b missions, we observe a seasonal glacier acceleration of 15% in the summer, from 1,250 to 1,500 m/yr near the grounding line, but the physical drivers of this seasonality have not been elucidated. Here, we use a subglacial hydrology model coupled one‐way to an ice sheet model to evaluate the role of subglacial hydrology as a physical mechanism explaining the seasonal acceleration. We find excellent agreement between the observed and predicted velocity in terms of timing and magnitude with the addition of an applied lower limit on effective pressure of 6% of ice overburden pressure. We conclude that seasonal changes in subglacial hydrology are sufficient to explain the observed seasonal speed up of Petermann Glacier. Article in Journal/Newspaper glacier Greenland Ice Sheet Petermann glacier Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 50 1 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Geophysics. Cosmic physics QC801-809 Shivani Ehrenfeucht Mathieu Morlighem Eric Rignot Christine F. Dow Jeremie Mouginot Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology |
topic_facet |
Geophysics. Cosmic physics QC801-809 |
description |
Abstract Petermann Glacier is a major outlet glacier of northern Greenland that drains a marine‐based basin vulnerable to destabilization from enhanced oceanic and atmospheric forcings. Using satellite radar interferometry data from the Sentinel‐1a/b missions, we observe a seasonal glacier acceleration of 15% in the summer, from 1,250 to 1,500 m/yr near the grounding line, but the physical drivers of this seasonality have not been elucidated. Here, we use a subglacial hydrology model coupled one‐way to an ice sheet model to evaluate the role of subglacial hydrology as a physical mechanism explaining the seasonal acceleration. We find excellent agreement between the observed and predicted velocity in terms of timing and magnitude with the addition of an applied lower limit on effective pressure of 6% of ice overburden pressure. We conclude that seasonal changes in subglacial hydrology are sufficient to explain the observed seasonal speed up of Petermann Glacier. |
format |
Article in Journal/Newspaper |
author |
Shivani Ehrenfeucht Mathieu Morlighem Eric Rignot Christine F. Dow Jeremie Mouginot |
author_facet |
Shivani Ehrenfeucht Mathieu Morlighem Eric Rignot Christine F. Dow Jeremie Mouginot |
author_sort |
Shivani Ehrenfeucht |
title |
Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology |
title_short |
Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology |
title_full |
Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology |
title_fullStr |
Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology |
title_full_unstemmed |
Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology |
title_sort |
seasonal acceleration of petermann glacier, greenland, from changes in subglacial hydrology |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022GL098009 https://doaj.org/article/c6c5f8e3989a46339b8b8195b91946fb |
genre |
glacier Greenland Ice Sheet Petermann glacier |
genre_facet |
glacier Greenland Ice Sheet Petermann glacier |
op_source |
Geophysical Research Letters, Vol 50, Iss 1, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2022GL098009 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL098009 https://doaj.org/article/c6c5f8e3989a46339b8b8195b91946fb |
op_doi |
https://doi.org/10.1029/2022GL098009 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
1 |
_version_ |
1810445011890733056 |