Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf
Marine ice, sometimes as part of an ice mélange, significantly affects ice shelf flow and ice fracture. The highly heterogeneous structure of the Brunt/Stancomb-Wills Ice Shelf (BSW) system in the east Weddell Sea offers a rare setting for uncovering the difference in rheology between meteoric and m...
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Language: | English |
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ftcdlib:qt0x35w9xn 2023-05-15T16:41:45+02:00 Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf Khazendar, A Rignot, E Larour, E 2009-12-01 application/pdf http://www.escholarship.org/uc/item/0x35w9xn english eng eScholarship, University of California qt0x35w9xn http://www.escholarship.org/uc/item/0x35w9xn Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Khazendar, A; Rignot, E; & Larour, E. (2009). Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf. Journal of Geophysical Research: Earth Surface, 114(4). doi:10.1029/2008JF001124. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/0x35w9xn article 2009 ftcdlib https://doi.org/10.1029/2008JF001124 2017-10-13T22:51:39Z Marine ice, sometimes as part of an ice mélange, significantly affects ice shelf flow and ice fracture. The highly heterogeneous structure of the Brunt/Stancomb-Wills Ice Shelf (BSW) system in the east Weddell Sea offers a rare setting for uncovering the difference in rheology between meteoric and marine ice. Here, we use data assimilation to infer the rheology of the Brunt/Stancomb-Wills Ice Shelf by an inverse control method that combines interferometric synthetic aperture radar measurements with numerical modeling. We then apply the inferred rheology to support the hypothesis attributing the observed 1970s ice shelf flow acceleration to a change in the stiffness of the ice mélange area connecting Brunt proper with Stancomb-Wills and to examine the consequences of frontal rift propagation. We conclude that while the Brunt/Stancomb-Wills system is currently not susceptible to extreme fragmentation similar to that of the Larsen B Ice Shelf in 2002, our inverse and forward modeling results emphasize its vulnerability to destabilization by relatively rapid changes in the ice mélange properties, resulting from the interaction of its marine ice component with ocean water, or by the further propagation of a frontal rift. Copyright 2009 by the American Geophysical Union. Article in Journal/Newspaper Ice Shelf Weddell Sea University of California: eScholarship Weddell Weddell Sea Journal of Geophysical Research 114 F4 |
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Open Polar |
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University of California: eScholarship |
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ftcdlib |
language |
English |
description |
Marine ice, sometimes as part of an ice mélange, significantly affects ice shelf flow and ice fracture. The highly heterogeneous structure of the Brunt/Stancomb-Wills Ice Shelf (BSW) system in the east Weddell Sea offers a rare setting for uncovering the difference in rheology between meteoric and marine ice. Here, we use data assimilation to infer the rheology of the Brunt/Stancomb-Wills Ice Shelf by an inverse control method that combines interferometric synthetic aperture radar measurements with numerical modeling. We then apply the inferred rheology to support the hypothesis attributing the observed 1970s ice shelf flow acceleration to a change in the stiffness of the ice mélange area connecting Brunt proper with Stancomb-Wills and to examine the consequences of frontal rift propagation. We conclude that while the Brunt/Stancomb-Wills system is currently not susceptible to extreme fragmentation similar to that of the Larsen B Ice Shelf in 2002, our inverse and forward modeling results emphasize its vulnerability to destabilization by relatively rapid changes in the ice mélange properties, resulting from the interaction of its marine ice component with ocean water, or by the further propagation of a frontal rift. Copyright 2009 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Khazendar, A Rignot, E Larour, E |
spellingShingle |
Khazendar, A Rignot, E Larour, E Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf |
author_facet |
Khazendar, A Rignot, E Larour, E |
author_sort |
Khazendar, A |
title |
Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf |
title_short |
Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf |
title_full |
Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf |
title_fullStr |
Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf |
title_full_unstemmed |
Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf |
title_sort |
roles of marine ice, rheology, and fracture in the flow and stability of the brunt/stancomb-wills ice shelf |
publisher |
eScholarship, University of California |
publishDate |
2009 |
url |
http://www.escholarship.org/uc/item/0x35w9xn |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Ice Shelf Weddell Sea |
genre_facet |
Ice Shelf Weddell Sea |
op_source |
Khazendar, A; Rignot, E; & Larour, E. (2009). Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf. Journal of Geophysical Research: Earth Surface, 114(4). doi:10.1029/2008JF001124. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/0x35w9xn |
op_relation |
qt0x35w9xn http://www.escholarship.org/uc/item/0x35w9xn |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2008JF001124 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
F4 |
_version_ |
1766032215962025984 |