The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture
The rate and direction of rift propagation through ice shelves depends on both the stress field and the heterogeneity, or otherwise, of the physical properties of the ice. The Brunt Ice Shelf in Antarctica has recently developed new rifts which are being actively monitored as they lengthen and inter...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2018
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/36208/ https://doi.org/10.5194/tc-12-3361-2018 https://nrl.northumbria.ac.uk/id/eprint/36208/1/King%20et%20al%20-%20The%20internal%20structure%20of%20the%20Brunt%20Ice%20Shelf%20from%20ice-penetrating%20radar%20analysis%20and%20implications%20for%20ice%20shelf%20fracture%20OA.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:36208 2023-05-15T13:56:54+02:00 The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture King, Edward de Rydt, Jan Gudmundsson, Hilmar 2018-10-24 text https://nrl.northumbria.ac.uk/id/eprint/36208/ https://doi.org/10.5194/tc-12-3361-2018 https://nrl.northumbria.ac.uk/id/eprint/36208/1/King%20et%20al%20-%20The%20internal%20structure%20of%20the%20Brunt%20Ice%20Shelf%20from%20ice-penetrating%20radar%20analysis%20and%20implications%20for%20ice%20shelf%20fracture%20OA.pdf en eng Copernicus Publications https://nrl.northumbria.ac.uk/id/eprint/36208/1/King%20et%20al%20-%20The%20internal%20structure%20of%20the%20Brunt%20Ice%20Shelf%20from%20ice-penetrating%20radar%20analysis%20and%20implications%20for%20ice%20shelf%20fracture%20OA.pdf King, Edward, de Rydt, Jan and Gudmundsson, Hilmar (2018) The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture. The Cryosphere, 12 (10). pp. 3361-3372. ISSN 1994-0416 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2018 ftunivnorthumb https://doi.org/10.5194/tc-12-3361-2018 2022-09-25T06:08:17Z The rate and direction of rift propagation through ice shelves depends on both the stress field and the heterogeneity, or otherwise, of the physical properties of the ice. The Brunt Ice Shelf in Antarctica has recently developed new rifts which are being actively monitored as they lengthen and interact with the internal structure of the ice shelf. Here we present the results of a ground-penetrating radar survey of the Brunt Ice Shelf aimed at understanding variations in the internal structure. We find that there are flow bands composed mostly of thick meteoric ice interspersed with thinner sections of ice shelf that have a large proportion of sea ice and sea-water-saturated firn. Therefore the ice shelf is, in essence, a series of ice tongues cemented together with ice mélange. The changes in structure are related both to the thickness and flow speed of ice at the grounding line and to subsequent processes of firn accumulation and brine infiltration as the ice shelf flows towards the calving front. It is shown that rifts propagating through the Brunt Ice Shelf preferentially skirt the edges of blocks of meteoric ice and slow their rate of propagation when forced by the stress field to break through them. Article in Journal/Newspaper Antarc* Antarctica Brunt Ice Shelf Ice Shelf Ice Shelves Sea ice The Cryosphere Northumbria University, Newcastle: Northumbria Research Link (NRL) Brunt Ice Shelf ENVELOPE(-22.500,-22.500,-74.750,-74.750) The Cryosphere 12 10 3361 3372 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences King, Edward de Rydt, Jan Gudmundsson, Hilmar The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
The rate and direction of rift propagation through ice shelves depends on both the stress field and the heterogeneity, or otherwise, of the physical properties of the ice. The Brunt Ice Shelf in Antarctica has recently developed new rifts which are being actively monitored as they lengthen and interact with the internal structure of the ice shelf. Here we present the results of a ground-penetrating radar survey of the Brunt Ice Shelf aimed at understanding variations in the internal structure. We find that there are flow bands composed mostly of thick meteoric ice interspersed with thinner sections of ice shelf that have a large proportion of sea ice and sea-water-saturated firn. Therefore the ice shelf is, in essence, a series of ice tongues cemented together with ice mélange. The changes in structure are related both to the thickness and flow speed of ice at the grounding line and to subsequent processes of firn accumulation and brine infiltration as the ice shelf flows towards the calving front. It is shown that rifts propagating through the Brunt Ice Shelf preferentially skirt the edges of blocks of meteoric ice and slow their rate of propagation when forced by the stress field to break through them. |
format |
Article in Journal/Newspaper |
author |
King, Edward de Rydt, Jan Gudmundsson, Hilmar |
author_facet |
King, Edward de Rydt, Jan Gudmundsson, Hilmar |
author_sort |
King, Edward |
title |
The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
title_short |
The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
title_full |
The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
title_fullStr |
The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
title_full_unstemmed |
The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
title_sort |
internal structure of the brunt ice shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://nrl.northumbria.ac.uk/id/eprint/36208/ https://doi.org/10.5194/tc-12-3361-2018 https://nrl.northumbria.ac.uk/id/eprint/36208/1/King%20et%20al%20-%20The%20internal%20structure%20of%20the%20Brunt%20Ice%20Shelf%20from%20ice-penetrating%20radar%20analysis%20and%20implications%20for%20ice%20shelf%20fracture%20OA.pdf |
long_lat |
ENVELOPE(-22.500,-22.500,-74.750,-74.750) |
geographic |
Brunt Ice Shelf |
geographic_facet |
Brunt Ice Shelf |
genre |
Antarc* Antarctica Brunt Ice Shelf Ice Shelf Ice Shelves Sea ice The Cryosphere |
genre_facet |
Antarc* Antarctica Brunt Ice Shelf Ice Shelf Ice Shelves Sea ice The Cryosphere |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/36208/1/King%20et%20al%20-%20The%20internal%20structure%20of%20the%20Brunt%20Ice%20Shelf%20from%20ice-penetrating%20radar%20analysis%20and%20implications%20for%20ice%20shelf%20fracture%20OA.pdf King, Edward, de Rydt, Jan and Gudmundsson, Hilmar (2018) The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture. The Cryosphere, 12 (10). pp. 3361-3372. ISSN 1994-0416 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-12-3361-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
10 |
container_start_page |
3361 |
op_container_end_page |
3372 |
_version_ |
1766264499800637440 |