Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison
AbstractWe 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 t...
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1998
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ftcdlib:oai:escholarship.org/ark:/13030/qt7fk5s6s1 2023-05-15T13:39:57+02:00 Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison MacAyeal, DR Rignot, E Hulbe, CL 419 - 428 1998-01-01 application/pdf https://escholarship.org/uc/item/7fk5s6s1 unknown eScholarship, University of California qt7fk5s6s1 https://escholarship.org/uc/item/7fk5s6s1 CC-BY CC-BY JOURNAL OF GLACIOLOGY, vol 44, iss 147 Meteorology & Atmospheric Sciences Physical Geography and Environmental Geoscience article 1998 ftcdlib 2020-03-06T23:56:38Z AbstractWe 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 Antarc* Antarctica Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Journal of Glaciology Ronne Ice Shelf Sea ice University of California: eScholarship Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Hemmen Ice Rise ENVELOPE(-49.767,-49.767,-77.950,-77.950) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences Physical Geography and Environmental Geoscience |
spellingShingle |
Meteorology & Atmospheric Sciences Physical Geography and Environmental Geoscience MacAyeal, DR Rignot, E Hulbe, CL Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison |
topic_facet |
Meteorology & Atmospheric Sciences Physical Geography and Environmental Geoscience |
description |
AbstractWe 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, DR Rignot, E Hulbe, CL |
author_facet |
MacAyeal, DR Rignot, E Hulbe, CL |
author_sort |
MacAyeal, DR |
title |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison |
title_short |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison |
title_full |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison |
title_fullStr |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison |
title_full_unstemmed |
Ice-shelf dynamics near the front of the Filchner-Ronne Ice Shelf, Antarctica, revealed by SAR interferometry: model/interferogram comparison |
title_sort |
ice-shelf dynamics near the front of the filchner-ronne ice shelf, antarctica, revealed by sar interferometry: model/interferogram comparison |
publisher |
eScholarship, University of California |
publishDate |
1998 |
url |
https://escholarship.org/uc/item/7fk5s6s1 |
op_coverage |
419 - 428 |
long_lat |
ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-49.767,-49.767,-77.950,-77.950) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Berkner Island Hemmen Ice Rise Ronne Ice Shelf |
geographic_facet |
Berkner Island Hemmen Ice Rise Ronne Ice Shelf |
genre |
Antarc* Antarctica Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Journal of Glaciology Ronne Ice Shelf Sea ice |
genre_facet |
Antarc* Antarctica 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, vol 44, iss 147 |
op_relation |
qt7fk5s6s1 https://escholarship.org/uc/item/7fk5s6s1 |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766126361393496064 |