Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry
ERS images of the two ends of the ice front of the Filchner-Ronne Ice Shelf, Antarctica, were utilized interferometrically to study the deformation rate of the ice shelf in response to viscous creep. On the western flank of Berkner Island (BI), near Hemmen Ice Rise (HIR), a time series of ERS data a...
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1997
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ftcdlib:oai:escholarship.org/ark:/13030/qt8vk187g0 2023-05-15T13:39:57+02:00 Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry Rignot, E MacAyeal, DR 863 - 866 1997-12-01 application/pdf https://escholarship.org/uc/item/8vk187g0 unknown eScholarship, University of California qt8vk187g0 https://escholarship.org/uc/item/8vk187g0 CC-BY CC-BY European Space Agency, (Special Publication) ESA SP, vol 414, iss 414 PART 2 Astronomy & Astrophysics article 1997 ftcdlib 2020-03-20T23:55:51Z ERS images of the two ends of the ice front of the Filchner-Ronne Ice Shelf, Antarctica, were utilized interferometrically to study the deformation rate of the ice shelf in response to viscous creep. On the western flank of Berkner Island (BI), near Hemmen Ice Rise (HIR), a time series of ERS data acquired in Feb 1992, in both ascending and descending mode, and with a 3-day time interval, were utilized to map the ice velocity in two dimensions. Finite-element ice-shelf flow simulations are compared with the ERS interferograms to interpret the ice motion in terms of the physical constraints on ice-shelf flow. Our efforts to fit artificial interferograms generated with model velocity output suggest that the flow regime is strongly influenced by three processes. First, a void-creation process responsible for rifts at coastal margins tends to uncouple the ice shelf from the ice rise and neighboring coast of BI. Second, sea ice within the void space appears to act as a binding agent between discrete ice-shelf fragments, allowing rigid-body rotations of these fragments. Third, strain rates appear to be enhanced in a narrow zone adjacent to HIR, implying significant strain softening along the boundary. We believe that SAR interferogram/model intercomparison represents a powerful impetus toward the development of better, more physically realistic ice-shelf flow models. Article in Journal/Newspaper Antarc* Antarctica Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf 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 |
Astronomy & Astrophysics |
spellingShingle |
Astronomy & Astrophysics Rignot, E MacAyeal, DR Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry |
topic_facet |
Astronomy & Astrophysics |
description |
ERS images of the two ends of the ice front of the Filchner-Ronne Ice Shelf, Antarctica, were utilized interferometrically to study the deformation rate of the ice shelf in response to viscous creep. On the western flank of Berkner Island (BI), near Hemmen Ice Rise (HIR), a time series of ERS data acquired in Feb 1992, in both ascending and descending mode, and with a 3-day time interval, were utilized to map the ice velocity in two dimensions. Finite-element ice-shelf flow simulations are compared with the ERS interferograms to interpret the ice motion in terms of the physical constraints on ice-shelf flow. Our efforts to fit artificial interferograms generated with model velocity output suggest that the flow regime is strongly influenced by three processes. First, a void-creation process responsible for rifts at coastal margins tends to uncouple the ice shelf from the ice rise and neighboring coast of BI. Second, sea ice within the void space appears to act as a binding agent between discrete ice-shelf fragments, allowing rigid-body rotations of these fragments. Third, strain rates appear to be enhanced in a narrow zone adjacent to HIR, implying significant strain softening along the boundary. We believe that SAR interferogram/model intercomparison represents a powerful impetus toward the development of better, more physically realistic ice-shelf flow models. |
format |
Article in Journal/Newspaper |
author |
Rignot, E MacAyeal, DR |
author_facet |
Rignot, E MacAyeal, DR |
author_sort |
Rignot, E |
title |
Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry |
title_short |
Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry |
title_full |
Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry |
title_fullStr |
Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry |
title_full_unstemmed |
Ice velocity at the ice front of the Filchner-Ronne Ice Shelf, Antarctica, as observed with ERS interferometry |
title_sort |
ice velocity at the ice front of the filchner-ronne ice shelf, antarctica, as observed with ers interferometry |
publisher |
eScholarship, University of California |
publishDate |
1997 |
url |
https://escholarship.org/uc/item/8vk187g0 |
op_coverage |
863 - 866 |
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 Ronne Ice Shelf Sea ice |
genre_facet |
Antarc* Antarctica Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice |
op_source |
European Space Agency, (Special Publication) ESA SP, vol 414, iss 414 PART 2 |
op_relation |
qt8vk187g0 https://escholarship.org/uc/item/8vk187g0 |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766126396613066752 |