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 depend 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...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004305 2023-05-15T13:34:49+02:00 The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture King, Edward C. De Rydt, Jan Gudmundsson, G. Hilmar 2018-10 electronic https://doi.org/10.5194/tc-12-3361-2018 https://noa.gwlb.de/receive/cop_mods_00004305 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004262/tc-12-3361-2018.pdf https://tc.copernicus.org/articles/12/3361/2018/tc-12-3361-2018.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-12-3361-2018 https://noa.gwlb.de/receive/cop_mods_00004305 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004262/tc-12-3361-2018.pdf https://tc.copernicus.org/articles/12/3361/2018/tc-12-3361-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/tc-12-3361-2018 2022-02-08T23:00:09Z The rate and direction of rift propagation through ice shelves depend 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 (ca. 250 m) meteoric ice interspersed with thinner (ca. 150 m) sections of ice shelf that have a large proportion of sea ice and seawater-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, in contrast to the situation on other ice shelves where rift propagation speeds up in meteoric ice. Article in Journal/Newspaper Antarc* Antarctica Brunt Ice Shelf Ice Shelf Ice Shelves Sea ice The Cryosphere Niedersächsisches Online-Archiv NOA Brunt Ice Shelf ENVELOPE(-22.500,-22.500,-74.750,-74.750) The Cryosphere 12 10 3361 3372 |
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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 King, Edward C. De Rydt, Jan Gudmundsson, G. Hilmar The internal structure of the Brunt Ice Shelf from ice-penetrating radar analysis and implications for ice shelf fracture |
topic_facet |
article Verlagsveröffentlichung |
description |
The rate and direction of rift propagation through ice shelves depend 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 (ca. 250 m) meteoric ice interspersed with thinner (ca. 150 m) sections of ice shelf that have a large proportion of sea ice and seawater-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, in contrast to the situation on other ice shelves where rift propagation speeds up in meteoric ice. |
format |
Article in Journal/Newspaper |
author |
King, Edward C. De Rydt, Jan Gudmundsson, G. Hilmar |
author_facet |
King, Edward C. De Rydt, Jan Gudmundsson, G. Hilmar |
author_sort |
King, Edward C. |
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://doi.org/10.5194/tc-12-3361-2018 https://noa.gwlb.de/receive/cop_mods_00004305 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004262/tc-12-3361-2018.pdf https://tc.copernicus.org/articles/12/3361/2018/tc-12-3361-2018.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 |
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-12-3361-2018 https://noa.gwlb.de/receive/cop_mods_00004305 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004262/tc-12-3361-2018.pdf https://tc.copernicus.org/articles/12/3361/2018/tc-12-3361-2018.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-12-3361-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
10 |
container_start_page |
3361 |
op_container_end_page |
3372 |
_version_ |
1766058289954553856 |