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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Copernicus Publications
2011
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ftdoajarticles:oai:doaj.org/article:198b1ca5ccd443849337cdc450163239 2023-05-15T13:38:55+02:00 The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica A. Humbert D. Steinhage 2011-10-01T00:00:00Z https://doi.org/10.5194/tc-5-931-2011 https://doaj.org/article/198b1ca5ccd443849337cdc450163239 EN eng Copernicus Publications http://www.the-cryosphere.net/5/931/2011/tc-5-931-2011.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-5-931-2011 1994-0416 1994-0424 https://doaj.org/article/198b1ca5ccd443849337cdc450163239 The Cryosphere, Vol 5, Iss 4, Pp 931-944 (2011) Environmental sciences GE1-350 Geology QE1-996.5 article 2011 ftdoajarticles https://doi.org/10.5194/tc-5-931-2011 2023-01-08T01:24:27Z 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. Article in Journal/Newspaper Antarc* Antarctica Fimbul Ice Shelf Ice Shelf The Cryosphere Directory of Open Access Journals: DOAJ Articles Fimbul Ice Shelf ENVELOPE(-0.500,-0.500,-70.750,-70.750) Jutulstraumen ENVELOPE(-1.000,-1.000,-72.000,-72.000) Ahlmannryggen ENVELOPE(-2.500,-2.500,-71.833,-71.833) Fimbulisen ENVELOPE(-0.500,-0.500,-70.750,-70.750) The Cryosphere 5 4 931 944 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 A. Humbert D. Steinhage The evolution of the western rift area of the Fimbul Ice Shelf, Antarctica |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
Article in Journal/Newspaper |
author |
A. Humbert D. Steinhage |
author_facet |
A. Humbert D. Steinhage |
author_sort |
A. Humbert |
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 |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/tc-5-931-2011 https://doaj.org/article/198b1ca5ccd443849337cdc450163239 |
long_lat |
ENVELOPE(-0.500,-0.500,-70.750,-70.750) ENVELOPE(-1.000,-1.000,-72.000,-72.000) ENVELOPE(-2.500,-2.500,-71.833,-71.833) ENVELOPE(-0.500,-0.500,-70.750,-70.750) |
geographic |
Fimbul Ice Shelf Jutulstraumen Ahlmannryggen Fimbulisen |
geographic_facet |
Fimbul Ice Shelf Jutulstraumen Ahlmannryggen Fimbulisen |
genre |
Antarc* Antarctica Fimbul Ice Shelf Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctica Fimbul Ice Shelf Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 5, Iss 4, Pp 931-944 (2011) |
op_relation |
http://www.the-cryosphere.net/5/931/2011/tc-5-931-2011.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-5-931-2011 1994-0416 1994-0424 https://doaj.org/article/198b1ca5ccd443849337cdc450163239 |
op_doi |
https://doi.org/10.5194/tc-5-931-2011 |
container_title |
The Cryosphere |
container_volume |
5 |
container_issue |
4 |
container_start_page |
931 |
op_container_end_page |
944 |
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1766112344799182848 |