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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ftcdlib:oai:escholarship.org:ark:/13030/qt0x35w9xn 2023-09-05T13:20:20+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 2009-01-01 application/pdf https://escholarship.org/uc/item/0x35w9xn unknown eScholarship, University of California qt0x35w9xn https://escholarship.org/uc/item/0x35w9xn CC-BY Journal of Geophysical Research, vol 114, iss F4 Life Below Water Meteorology & Atmospheric Sciences article 2009 ftcdlib 2023-08-21T18:04:15Z 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 Sea Weddell |
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Open Polar |
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University of California: eScholarship |
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language |
unknown |
topic |
Life Below Water Meteorology & Atmospheric Sciences |
spellingShingle |
Life Below Water Meteorology & Atmospheric Sciences 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 |
topic_facet |
Life Below Water Meteorology & Atmospheric Sciences |
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 |
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 |
https://escholarship.org/uc/item/0x35w9xn |
geographic |
Weddell Sea Weddell |
geographic_facet |
Weddell Sea Weddell |
genre |
Ice Shelf Weddell Sea |
genre_facet |
Ice Shelf Weddell Sea |
op_source |
Journal of Geophysical Research, vol 114, iss F4 |
op_relation |
qt0x35w9xn https://escholarship.org/uc/item/0x35w9xn |
op_rights |
CC-BY |
_version_ |
1776201027255533568 |