Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method
The Antarctic Ice Sheet is surrounded by large floating ice shelves that spread under their own weight into the ocean. Ice shelf rigidity depends on ice temperature and fabrics, and is influenced by ice flow and the delicate balance between bottom and surface accumulation. Here, we use an inverse co...
Published in: | Geophysical Research Letters |
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Language: | English |
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ftcdlib:qt6w21g3td 2023-05-15T14:04:14+02:00 Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method Larour, E Rignot, E Joughin, I Aubry, D 1 - 4 2005-03-16 application/pdf http://www.escholarship.org/uc/item/6w21g3td english eng eScholarship, University of California qt6w21g3td http://www.escholarship.org/uc/item/6w21g3td Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Larour, E; Rignot, E; Joughin, I; & Aubry, D. (2005). Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method. Geophysical Research Letters, 32(5), 1 - 4. doi:10.1029/2004GL021693. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/6w21g3td article 2005 ftcdlib https://doi.org/10.1029/2004GL021693 2018-07-06T22:51:35Z The Antarctic Ice Sheet is surrounded by large floating ice shelves that spread under their own weight into the ocean. Ice shelf rigidity depends on ice temperature and fabrics, and is influenced by ice flow and the delicate balance between bottom and surface accumulation. Here, we use an inverse control method to infer the rigidity of the Ronne Ice Shelf that best matches observations of ice velocity from satellite radar interferometry. Ice rigidity, or flow law parameter B, is shown to vary between 300 and 900 kPa a1/3. Ice is softer along the side margins due to frictional heating, and harder along the outflow of large glaciers, which advect cold continental ice. Melting at the bottom surface of the ice shelf increases its rigidity, while freezing decreases it. Accurate numerical modelling of ice shelf flow must account for this spatial variability in mechanical characteristics. Copyright 2005 by the American Geophysical Union. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Ronne Ice Shelf University of California: eScholarship Antarctic Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) The Antarctic Geophysical Research Letters 32 5 |
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Open Polar |
collection |
University of California: eScholarship |
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ftcdlib |
language |
English |
description |
The Antarctic Ice Sheet is surrounded by large floating ice shelves that spread under their own weight into the ocean. Ice shelf rigidity depends on ice temperature and fabrics, and is influenced by ice flow and the delicate balance between bottom and surface accumulation. Here, we use an inverse control method to infer the rigidity of the Ronne Ice Shelf that best matches observations of ice velocity from satellite radar interferometry. Ice rigidity, or flow law parameter B, is shown to vary between 300 and 900 kPa a1/3. Ice is softer along the side margins due to frictional heating, and harder along the outflow of large glaciers, which advect cold continental ice. Melting at the bottom surface of the ice shelf increases its rigidity, while freezing decreases it. Accurate numerical modelling of ice shelf flow must account for this spatial variability in mechanical characteristics. Copyright 2005 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Larour, E Rignot, E Joughin, I Aubry, D |
spellingShingle |
Larour, E Rignot, E Joughin, I Aubry, D Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method |
author_facet |
Larour, E Rignot, E Joughin, I Aubry, D |
author_sort |
Larour, E |
title |
Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method |
title_short |
Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method |
title_full |
Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method |
title_fullStr |
Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method |
title_full_unstemmed |
Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method |
title_sort |
rheology of the ronne ice shelf, antarctica, inferred from satellite radar interferometry data using an inverse control method |
publisher |
eScholarship, University of California |
publishDate |
2005 |
url |
http://www.escholarship.org/uc/item/6w21g3td |
op_coverage |
1 - 4 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic Ronne Ice Shelf The Antarctic |
geographic_facet |
Antarctic Ronne Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Ronne Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Ronne Ice Shelf |
op_source |
Larour, E; Rignot, E; Joughin, I; & Aubry, D. (2005). Rheology of the Ronne Ice Shelf, Antarctica, inferred from satellite radar interferometry data using an inverse control method. Geophysical Research Letters, 32(5), 1 - 4. doi:10.1029/2004GL021693. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/6w21g3td |
op_relation |
qt6w21g3td http://www.escholarship.org/uc/item/6w21g3td |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2004GL021693 |
container_title |
Geophysical Research Letters |
container_volume |
32 |
container_issue |
5 |
_version_ |
1766275265897431040 |