On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling
Ice shelves play a key role in the stability of the Antarctic Ice Sheet due to their buttressing effect. A loss of buttressing as a result of increased basal melting or ice shelf disintegration will lead to increased ice discharge. Some ice shelves exhibit channels at the base that are not yet fully...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00063145 2023-05-15T13:49:21+02:00 On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling Humbert, Angelika Christmann, Julia Corr, Hugh F. J. Helm, Veit Höyns, Lea-Sophie Hofstede, Coen Müller, Ralf Neckel, Niklas Nicholls, Keith W. Schultz, Timm Steinhage, Daniel Wolovick, Michael Zeising, Ole 2022-10 electronic https://doi.org/10.5194/tc-16-4107-2022 https://noa.gwlb.de/receive/cop_mods_00063145 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062272/tc-16-4107-2022.pdf https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-4107-2022 https://noa.gwlb.de/receive/cop_mods_00063145 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062272/tc-16-4107-2022.pdf https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/tc-16-4107-2022 2022-10-23T23:12:06Z Ice shelves play a key role in the stability of the Antarctic Ice Sheet due to their buttressing effect. A loss of buttressing as a result of increased basal melting or ice shelf disintegration will lead to increased ice discharge. Some ice shelves exhibit channels at the base that are not yet fully understood. In this study, we present in situ melt rates of a channel which is up to 330 m high and located in the southern Filchner Ice Shelf. Maximum observed melt rates are 2 m yr−1. Melt rates inside the channel decrease in the direction of ice flow and turn to freezing ∼55 km downstream of the grounding line. While closer to the grounding line melt rates are higher within the channel than outside, this relationship reverses further downstream. Comparing the modeled evolution of this channel under present-day climate conditions over 250 years with its present geometry reveals a mismatch. Melt rates twice as large as the present-day values are required to fit the observed geometry. In contrast, forcing the model with present-day melt rates results in a closure of the channel, which contradicts observations. The ice shelf experiences strong tidal variability in vertical strain rates at the measured site, and discrete pulses of increased melting occurred throughout the measurement period. The type of melt channel in this study diminishes in height with distance from the grounding line and is hence not a destabilizing factor for ice shelves. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere Niedersächsisches Online-Archiv NOA Antarctic Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) The Antarctic The Cryosphere 16 10 4107 4139 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Humbert, Angelika Christmann, Julia Corr, Hugh F. J. Helm, Veit Höyns, Lea-Sophie Hofstede, Coen Müller, Ralf Neckel, Niklas Nicholls, Keith W. Schultz, Timm Steinhage, Daniel Wolovick, Michael Zeising, Ole On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling |
topic_facet |
article Verlagsveröffentlichung |
description |
Ice shelves play a key role in the stability of the Antarctic Ice Sheet due to their buttressing effect. A loss of buttressing as a result of increased basal melting or ice shelf disintegration will lead to increased ice discharge. Some ice shelves exhibit channels at the base that are not yet fully understood. In this study, we present in situ melt rates of a channel which is up to 330 m high and located in the southern Filchner Ice Shelf. Maximum observed melt rates are 2 m yr−1. Melt rates inside the channel decrease in the direction of ice flow and turn to freezing ∼55 km downstream of the grounding line. While closer to the grounding line melt rates are higher within the channel than outside, this relationship reverses further downstream. Comparing the modeled evolution of this channel under present-day climate conditions over 250 years with its present geometry reveals a mismatch. Melt rates twice as large as the present-day values are required to fit the observed geometry. In contrast, forcing the model with present-day melt rates results in a closure of the channel, which contradicts observations. The ice shelf experiences strong tidal variability in vertical strain rates at the measured site, and discrete pulses of increased melting occurred throughout the measurement period. The type of melt channel in this study diminishes in height with distance from the grounding line and is hence not a destabilizing factor for ice shelves. |
format |
Article in Journal/Newspaper |
author |
Humbert, Angelika Christmann, Julia Corr, Hugh F. J. Helm, Veit Höyns, Lea-Sophie Hofstede, Coen Müller, Ralf Neckel, Niklas Nicholls, Keith W. Schultz, Timm Steinhage, Daniel Wolovick, Michael Zeising, Ole |
author_facet |
Humbert, Angelika Christmann, Julia Corr, Hugh F. J. Helm, Veit Höyns, Lea-Sophie Hofstede, Coen Müller, Ralf Neckel, Niklas Nicholls, Keith W. Schultz, Timm Steinhage, Daniel Wolovick, Michael Zeising, Ole |
author_sort |
Humbert, Angelika |
title |
On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling |
title_short |
On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling |
title_full |
On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling |
title_fullStr |
On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling |
title_full_unstemmed |
On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling |
title_sort |
on the evolution of an ice shelf melt channel at the base of filchner ice shelf, from observations and viscoelastic modeling |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-4107-2022 https://noa.gwlb.de/receive/cop_mods_00063145 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062272/tc-16-4107-2022.pdf https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf |
long_lat |
ENVELOPE(-40.000,-40.000,-79.000,-79.000) |
geographic |
Antarctic Filchner Ice Shelf The Antarctic |
geographic_facet |
Antarctic Filchner Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-4107-2022 https://noa.gwlb.de/receive/cop_mods_00063145 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062272/tc-16-4107-2022.pdf https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-16-4107-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
10 |
container_start_page |
4107 |
op_container_end_page |
4139 |
_version_ |
1766251240318042112 |