Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin
On RADARSAT imagery, the southern margin of the onset zone of Bindschadler Ice Stream, West Antarctica, manifests a multi-banded feature, with brightness varying across the bands and oscillating along each band. Ground-based radar profiles across the margin reveal folds in the firn stratigraphy asso...
Published in: | Annals of Glaciology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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International Glaciological Society
2013
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Online Access: | https://eprints.whiterose.ac.uk/78911/ https://eprints.whiterose.ac.uk/78911/1/ng_and_king_2013.pdf https://doi.org/10.3189/2013AoG64A202 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:78911 2024-06-02T07:55:22+00:00 Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin Ng, F.S. King, E.C. 2013-09-01 text https://eprints.whiterose.ac.uk/78911/ https://eprints.whiterose.ac.uk/78911/1/ng_and_king_2013.pdf https://doi.org/10.3189/2013AoG64A202 en eng International Glaciological Society https://eprints.whiterose.ac.uk/78911/1/ng_and_king_2013.pdf Ng, F.S. and King, E.C. (2013) Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin. Annals of Glaciology, 54 (64). 90 - 96. ISSN 0260-3055 Article PeerReviewed 2013 ftleedsuniv https://doi.org/10.3189/2013AoG64A202 2024-05-06T12:43:25Z On RADARSAT imagery, the southern margin of the onset zone of Bindschadler Ice Stream, West Antarctica, manifests a multi-banded feature, with brightness varying across the bands and oscillating along each band. Ground-based radar profiles across the margin reveal folds in the firn stratigraphy associated with this pattern and provide evidence for correlation between the depth of shallow isochrones and the RADARSAT backscatter intensity on each profile, allowing us to interpret the banded feature for firn-layer geometry in three dimensions. We use a kinematic model of isochrone depth evolution to show how layer folding and the band expression may result from deformation and advection in the near-surface flow field at ice-stream margins, even with steady flow. The model predicts the formation of longitudinally patterned bands when the ice-stream acceleration fluctuates along flow. Concerted study of the planform and stratigraphy of other RADARSAT-detected features on the ice sheets may help us understand their origin. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Bindschadler Ice Stream West Antarctica White Rose Research Online (Universities of Leeds, Sheffield & York) Bindschadler Ice Stream ENVELOPE(-142.000,-142.000,-81.000,-81.000) West Antarctica Annals of Glaciology 54 64 90 96 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
On RADARSAT imagery, the southern margin of the onset zone of Bindschadler Ice Stream, West Antarctica, manifests a multi-banded feature, with brightness varying across the bands and oscillating along each band. Ground-based radar profiles across the margin reveal folds in the firn stratigraphy associated with this pattern and provide evidence for correlation between the depth of shallow isochrones and the RADARSAT backscatter intensity on each profile, allowing us to interpret the banded feature for firn-layer geometry in three dimensions. We use a kinematic model of isochrone depth evolution to show how layer folding and the band expression may result from deformation and advection in the near-surface flow field at ice-stream margins, even with steady flow. The model predicts the formation of longitudinally patterned bands when the ice-stream acceleration fluctuates along flow. Concerted study of the planform and stratigraphy of other RADARSAT-detected features on the ice sheets may help us understand their origin. |
format |
Article in Journal/Newspaper |
author |
Ng, F.S. King, E.C. |
spellingShingle |
Ng, F.S. King, E.C. Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin |
author_facet |
Ng, F.S. King, E.C. |
author_sort |
Ng, F.S. |
title |
Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin |
title_short |
Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin |
title_full |
Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin |
title_fullStr |
Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin |
title_full_unstemmed |
Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin |
title_sort |
formation of radarsat backscatter feature and undulating firn stratigraphy at an ice-stream margin |
publisher |
International Glaciological Society |
publishDate |
2013 |
url |
https://eprints.whiterose.ac.uk/78911/ https://eprints.whiterose.ac.uk/78911/1/ng_and_king_2013.pdf https://doi.org/10.3189/2013AoG64A202 |
long_lat |
ENVELOPE(-142.000,-142.000,-81.000,-81.000) |
geographic |
Bindschadler Ice Stream West Antarctica |
geographic_facet |
Bindschadler Ice Stream West Antarctica |
genre |
Annals of Glaciology Antarc* Antarctica Bindschadler Ice Stream West Antarctica |
genre_facet |
Annals of Glaciology Antarc* Antarctica Bindschadler Ice Stream West Antarctica |
op_relation |
https://eprints.whiterose.ac.uk/78911/1/ng_and_king_2013.pdf Ng, F.S. and King, E.C. (2013) Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin. Annals of Glaciology, 54 (64). 90 - 96. ISSN 0260-3055 |
op_doi |
https://doi.org/10.3189/2013AoG64A202 |
container_title |
Annals of Glaciology |
container_volume |
54 |
container_issue |
64 |
container_start_page |
90 |
op_container_end_page |
96 |
_version_ |
1800748157891510272 |