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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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/tc-16-4107-2022 https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf https://doaj.org/article/5dfe9d0c25354de0a1e909df18e69804 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:5dfe9d0c25354de0a1e909df18e69804 2023-05-15T13:32:07+02:00 On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling A. Humbert J. Christmann H. F. J. Corr V. Helm L.-S. Höyns C. Hofstede R. Müller N. Neckel K. W. Nicholls T. Schultz D. Steinhage M. Wolovick O. Zeising 2022-10-01 https://doi.org/10.5194/tc-16-4107-2022 https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf https://doaj.org/article/5dfe9d0c25354de0a1e909df18e69804 en eng Copernicus Publications doi:10.5194/tc-16-4107-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf https://doaj.org/article/5dfe9d0c25354de0a1e909df18e69804 undefined The Cryosphere, Vol 16, Pp 4107-4139 (2022) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/tc-16-4107-2022 2023-01-22T17:49:58Z 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 Unknown Antarctic Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) The Antarctic The Cryosphere 16 10 4107 4139 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo A. Humbert J. Christmann H. F. J. Corr V. Helm L.-S. Höyns C. Hofstede R. Müller N. Neckel K. W. Nicholls T. Schultz D. Steinhage M. Wolovick O. Zeising On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling |
topic_facet |
envir geo |
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 |
A. Humbert J. Christmann H. F. J. Corr V. Helm L.-S. Höyns C. Hofstede R. Müller N. Neckel K. W. Nicholls T. Schultz D. Steinhage M. Wolovick O. Zeising |
author_facet |
A. Humbert J. Christmann H. F. J. Corr V. Helm L.-S. Höyns C. Hofstede R. Müller N. Neckel K. W. Nicholls T. Schultz D. Steinhage M. Wolovick O. Zeising |
author_sort |
A. Humbert |
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://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf https://doaj.org/article/5dfe9d0c25354de0a1e909df18e69804 |
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_source |
The Cryosphere, Vol 16, Pp 4107-4139 (2022) |
op_relation |
doi:10.5194/tc-16-4107-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/4107/2022/tc-16-4107-2022.pdf https://doaj.org/article/5dfe9d0c25354de0a1e909df18e69804 |
op_rights |
undefined |
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 |
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1766024357734252544 |