Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland
Greenland’s outlet glaciers have been a leading source of mass loss and accompanying sea-level rise from the Greenland Ice Sheet (GrIS) over the last 25 years. The dynamic component of outlet glacier mass loss depends on both the ice flux through the terminus and the inland extent of glacier thinnin...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/411208 2023-12-10T09:48:49+01:00 Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland Felikson, Denis Catania, Ginny Bartholomaus, Timothy C. Morlighem, Mathieu Noël, Brice P. Y. Sub Dynamics Meteorology Marine and Atmospheric Research 2021-01-28 application/pdf https://dspace.library.uu.nl/handle/1874/411208 eng eng https://dspace.library.uu.nl/handle/1874/411208 info:eu-repo/semantics/OpenAccess 2021 ftunivutrecht 2023-11-15T23:15:43Z Greenland’s outlet glaciers have been a leading source of mass loss and accompanying sea-level rise from the Greenland Ice Sheet (GrIS) over the last 25 years. The dynamic component of outlet glacier mass loss depends on both the ice flux through the terminus and the inland extent of glacier thinning, initiated at the ice-ocean interface. Here, we find limits to the inland spread of thinning that initiates at glacier termini for 141 ocean-terminating outlet glaciers around the GrIS. Inland diffusion of thinning is limited by steep reaches of bed topography that we call “knickpoints.” We show that knickpoints exist beneath the majority of outlet glaciers but they are less steep in regions of gentle bed topography, giving glaciers in gentle bed topography the potential to contribute to ongoing and future mass loss from the GrIS by allowing the diffusion of thinning far into the ice sheet interior. Other/Unknown Material glacier Greenland Ice Sheet Utrecht University Repository Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
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ftunivutrecht |
language |
English |
description |
Greenland’s outlet glaciers have been a leading source of mass loss and accompanying sea-level rise from the Greenland Ice Sheet (GrIS) over the last 25 years. The dynamic component of outlet glacier mass loss depends on both the ice flux through the terminus and the inland extent of glacier thinning, initiated at the ice-ocean interface. Here, we find limits to the inland spread of thinning that initiates at glacier termini for 141 ocean-terminating outlet glaciers around the GrIS. Inland diffusion of thinning is limited by steep reaches of bed topography that we call “knickpoints.” We show that knickpoints exist beneath the majority of outlet glaciers but they are less steep in regions of gentle bed topography, giving glaciers in gentle bed topography the potential to contribute to ongoing and future mass loss from the GrIS by allowing the diffusion of thinning far into the ice sheet interior. |
author2 |
Sub Dynamics Meteorology Marine and Atmospheric Research |
author |
Felikson, Denis Catania, Ginny Bartholomaus, Timothy C. Morlighem, Mathieu Noël, Brice P. Y. |
spellingShingle |
Felikson, Denis Catania, Ginny Bartholomaus, Timothy C. Morlighem, Mathieu Noël, Brice P. Y. Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland |
author_facet |
Felikson, Denis Catania, Ginny Bartholomaus, Timothy C. Morlighem, Mathieu Noël, Brice P. Y. |
author_sort |
Felikson, Denis |
title |
Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland |
title_short |
Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland |
title_full |
Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland |
title_fullStr |
Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland |
title_full_unstemmed |
Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland |
title_sort |
steep glacier bed knickpoints mitigate inland thinning in greenland |
publishDate |
2021 |
url |
https://dspace.library.uu.nl/handle/1874/411208 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_relation |
https://dspace.library.uu.nl/handle/1874/411208 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784892988959227904 |