The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica
This paper studies the evolution of a zone in the Fimbul Ice Shelf that is characterised by large crevasses and rifts west of Jutulstraumen, an outlet glacier flowing into Fimbulisen. High-resolution radar imagery and radio echo sounding data were used to study the surface and internal structure of...
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ftcopernicus:oai:publications.copernicus.org:tc11048 2023-05-15T13:36:36+02:00 The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica Humbert, A. Steinhage, D. 2018-09-27 application/pdf https://doi.org/10.5194/tc-5-931-2011 https://tc.copernicus.org/articles/5/931/2011/ eng eng doi:10.5194/tc-5-931-2011 https://tc.copernicus.org/articles/5/931/2011/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-5-931-2011 2020-07-20T16:25:59Z This paper studies the evolution of a zone in the Fimbul Ice Shelf that is characterised by large crevasses and rifts west of Jutulstraumen, an outlet glacier flowing into Fimbulisen. High-resolution radar imagery and radio echo sounding data were used to study the surface and internal structure of this rift area and to define zones of similar characteristics. The western rift area is dominated by two factors: a small ice rumple that leads to basal crevasses and disturbs the homogeneity of the ice, and a zone with fibre-like blocks. Downstream of the rumple we found down-welling of internal layers and local thinning, which we explain as a result of basal crevasses due to the basal drag at the ice rumple. North of Ahlmannryggen the ice loses its lateral constraint and forms individual blocks, which are deformed like fibres under shear, where the ice stream merges with slower moving ice masses of the western side. There, the ice loses its integrity, which initiates the western rift system. The velocity difference between the slow moving western part and the fast moving extension of Jutulstraumen produces shear stress that causes the rifts to form tails and expand them to the major rifts of up to 30 km length. Text Antarc* Antarctica Fimbul Ice Shelf Ice Shelf Copernicus Publications: E-Journals Ahlmannryggen ENVELOPE(-2.500,-2.500,-71.833,-71.833) Fimbul Ice Shelf ENVELOPE(-0.500,-0.500,-70.750,-70.750) Fimbulisen ENVELOPE(-0.500,-0.500,-70.750,-70.750) Jutulstraumen ENVELOPE(-1.000,-1.000,-72.000,-72.000) The Cryosphere 5 4 931 944 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
This paper studies the evolution of a zone in the Fimbul Ice Shelf that is characterised by large crevasses and rifts west of Jutulstraumen, an outlet glacier flowing into Fimbulisen. High-resolution radar imagery and radio echo sounding data were used to study the surface and internal structure of this rift area and to define zones of similar characteristics. The western rift area is dominated by two factors: a small ice rumple that leads to basal crevasses and disturbs the homogeneity of the ice, and a zone with fibre-like blocks. Downstream of the rumple we found down-welling of internal layers and local thinning, which we explain as a result of basal crevasses due to the basal drag at the ice rumple. North of Ahlmannryggen the ice loses its lateral constraint and forms individual blocks, which are deformed like fibres under shear, where the ice stream merges with slower moving ice masses of the western side. There, the ice loses its integrity, which initiates the western rift system. The velocity difference between the slow moving western part and the fast moving extension of Jutulstraumen produces shear stress that causes the rifts to form tails and expand them to the major rifts of up to 30 km length. |
format |
Text |
author |
Humbert, A. Steinhage, D. |
spellingShingle |
Humbert, A. Steinhage, D. The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica |
author_facet |
Humbert, A. Steinhage, D. |
author_sort |
Humbert, A. |
title |
The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica |
title_short |
The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica |
title_full |
The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica |
title_fullStr |
The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica |
title_full_unstemmed |
The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica |
title_sort |
evolution of the western rift area of the fimbul ice shelf, antarctica |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-5-931-2011 https://tc.copernicus.org/articles/5/931/2011/ |
long_lat |
ENVELOPE(-2.500,-2.500,-71.833,-71.833) ENVELOPE(-0.500,-0.500,-70.750,-70.750) ENVELOPE(-0.500,-0.500,-70.750,-70.750) ENVELOPE(-1.000,-1.000,-72.000,-72.000) |
geographic |
Ahlmannryggen Fimbul Ice Shelf Fimbulisen Jutulstraumen |
geographic_facet |
Ahlmannryggen Fimbul Ice Shelf Fimbulisen Jutulstraumen |
genre |
Antarc* Antarctica Fimbul Ice Shelf Ice Shelf |
genre_facet |
Antarc* Antarctica Fimbul Ice Shelf Ice Shelf |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-5-931-2011 https://tc.copernicus.org/articles/5/931/2011/ |
op_doi |
https://doi.org/10.5194/tc-5-931-2011 |
container_title |
The Cryosphere |
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5 |
container_issue |
4 |
container_start_page |
931 |
op_container_end_page |
944 |
_version_ |
1766081254804946944 |