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: | http://nora.nerc.ac.uk/id/eprint/503569/ https://nora.nerc.ac.uk/id/eprint/503569/1/Ng%20and%20King%202013.pdf https://doi.org/10.3189/2013AoG64A202 |
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ftnerc:oai:nora.nerc.ac.uk:503569 2023-05-15T13:29:43+02:00 Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin NG, Felix King, Edward C. 2013-10 text http://nora.nerc.ac.uk/id/eprint/503569/ https://nora.nerc.ac.uk/id/eprint/503569/1/Ng%20and%20King%202013.pdf https://doi.org/10.3189/2013AoG64A202 en eng International Glaciological Society https://nora.nerc.ac.uk/id/eprint/503569/1/Ng%20and%20King%202013.pdf NG, Felix; King, Edward C. orcid:0000-0003-3793-3915 . 2013 Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin. Annals of Glaciology, 54 (64). 90-96. https://doi.org/10.3189/2013AoG64A202 <https://doi.org/10.3189/2013AoG64A202> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.3189/2013AoG64A202 2023-02-04T19:37:54Z 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 Natural Environment Research Council: NERC Open Research Archive West Antarctica Bindschadler Ice Stream ENVELOPE(-142.000,-142.000,-81.000,-81.000) Annals of Glaciology 54 64 90 96 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
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, Felix King, Edward C. |
spellingShingle |
NG, Felix King, Edward C. Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin |
author_facet |
NG, Felix King, Edward C. |
author_sort |
NG, Felix |
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 |
http://nora.nerc.ac.uk/id/eprint/503569/ https://nora.nerc.ac.uk/id/eprint/503569/1/Ng%20and%20King%202013.pdf https://doi.org/10.3189/2013AoG64A202 |
long_lat |
ENVELOPE(-142.000,-142.000,-81.000,-81.000) |
geographic |
West Antarctica Bindschadler Ice Stream |
geographic_facet |
West Antarctica Bindschadler Ice Stream |
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://nora.nerc.ac.uk/id/eprint/503569/1/Ng%20and%20King%202013.pdf NG, Felix; King, Edward C. orcid:0000-0003-3793-3915 . 2013 Formation of RADARSAT backscatter feature and undulating firn stratigraphy at an ice-stream margin. Annals of Glaciology, 54 (64). 90-96. https://doi.org/10.3189/2013AoG64A202 <https://doi.org/10.3189/2013AoG64A202> |
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_ |
1766002369729921024 |