Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison
Abstract We compare European remote-sensing satellite (ERS) synthetic aperture radar interferograms with artificial interferograms constructed using output of a finite-element ice-shelf flow model to study the dynamics of Filchner-Ronne Ice Shelf (FRIS), Antaretica, near Hemmen Ice Rise (HIR) where...
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Cambridge University Press (CUP)
1998
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Online Access: | http://dx.doi.org/10.1017/s0022143000002744 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002744 |
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crcambridgeupr:10.1017/s0022143000002744 2024-03-03T08:43:17+00:00 Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison MacAyeal, Douglas R Rignot, Eric Hulbe, Christina L 1998 http://dx.doi.org/10.1017/s0022143000002744 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002744 en eng Cambridge University Press (CUP) Journal of Glaciology volume 44, issue 147, page 419-428 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1998 crcambridgeupr https://doi.org/10.1017/s0022143000002744 2024-02-08T08:36:10Z Abstract We compare European remote-sensing satellite (ERS) synthetic aperture radar interferograms with artificial interferograms constructed using output of a finite-element ice-shelf flow model to study the dynamics of Filchner-Ronne Ice Shelf (FRIS), Antaretica, near Hemmen Ice Rise (HIR) where the iceberg-calving front intersects Berkner Island. We find that the model must account for rifts, mechanically competent sea ice which fills rifts, and ice softening in coastal boundary layers in order to agree with the ice-deformation pattern implied by observed interferograms. Analysis of the stress field in the model experiment that best matches the observed interferograms suggests that: (1) HIR introduces weakness into the ice shelf through the generation of large-scale rifts, and (2) the melange of sea ice and ice-shelf fragments that fills the rifts stabilizes the shelf front by providing mechanical coupling between the fractured shelf front and the adjacent coast. The rift-filling melange could melt more easily than the surrounding ice shelf and thus could represent a vulnerability of the FRIS to climate warming. Article in Journal/Newspaper Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Journal of Glaciology Ronne Ice Shelf Sea ice Cambridge University Press Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Hemmen Ice Rise ENVELOPE(-49.767,-49.767,-77.950,-77.950) Journal of Glaciology 44 147 419 428 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes MacAyeal, Douglas R Rignot, Eric Hulbe, Christina L Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison |
topic_facet |
Earth-Surface Processes |
description |
Abstract We compare European remote-sensing satellite (ERS) synthetic aperture radar interferograms with artificial interferograms constructed using output of a finite-element ice-shelf flow model to study the dynamics of Filchner-Ronne Ice Shelf (FRIS), Antaretica, near Hemmen Ice Rise (HIR) where the iceberg-calving front intersects Berkner Island. We find that the model must account for rifts, mechanically competent sea ice which fills rifts, and ice softening in coastal boundary layers in order to agree with the ice-deformation pattern implied by observed interferograms. Analysis of the stress field in the model experiment that best matches the observed interferograms suggests that: (1) HIR introduces weakness into the ice shelf through the generation of large-scale rifts, and (2) the melange of sea ice and ice-shelf fragments that fills the rifts stabilizes the shelf front by providing mechanical coupling between the fractured shelf front and the adjacent coast. The rift-filling melange could melt more easily than the surrounding ice shelf and thus could represent a vulnerability of the FRIS to climate warming. |
format |
Article in Journal/Newspaper |
author |
MacAyeal, Douglas R Rignot, Eric Hulbe, Christina L |
author_facet |
MacAyeal, Douglas R Rignot, Eric Hulbe, Christina L |
author_sort |
MacAyeal, Douglas R |
title |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison |
title_short |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison |
title_full |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison |
title_fullStr |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison |
title_full_unstemmed |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antaretica, revealed by SAR interferometry: model/interferogram comparison |
title_sort |
ice-shelf dynamics near the front of the filchner-ronne ice shelf, antaretica, revealed by sar interferometry: model/interferogram comparison |
publisher |
Cambridge University Press (CUP) |
publishDate |
1998 |
url |
http://dx.doi.org/10.1017/s0022143000002744 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002744 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-49.767,-49.767,-77.950,-77.950) |
geographic |
Ronne Ice Shelf Berkner Island Hemmen Ice Rise |
geographic_facet |
Ronne Ice Shelf Berkner Island Hemmen Ice Rise |
genre |
Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Journal of Glaciology Ronne Ice Shelf Sea ice |
genre_facet |
Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Journal of Glaciology Ronne Ice Shelf Sea ice |
op_source |
Journal of Glaciology volume 44, issue 147, page 419-428 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000002744 |
container_title |
Journal of Glaciology |
container_volume |
44 |
container_issue |
147 |
container_start_page |
419 |
op_container_end_page |
428 |
_version_ |
1792498703921053696 |