Three-dimensional mapping by Cryosat 2 of subglacial lake volumes
We analyze data acquired by the CryoSat-2 interferometric radar altimeter and demonstrate its novel capability to track topographic features on the Antarctic Ice Sheet. We map the perimeter and depth of a 260 km2 surface depression above an Antarctic subglacial lake (SGL) and, in combination with Ic...
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ftnerc:oai:nora.nerc.ac.uk:502072 2023-05-15T13:48:07+02:00 Three-dimensional mapping by Cryosat 2 of subglacial lake volumes McMillan, Malcolm Corr, Hugh Shepherd, Andrew Ridout, Andrew Laxon, Seymour Cullen, Robert 2013-08-28 text http://nora.nerc.ac.uk/id/eprint/502072/ https://nora.nerc.ac.uk/id/eprint/502072/1/grl50689.pdf en eng https://nora.nerc.ac.uk/id/eprint/502072/1/grl50689.pdf McMillan, Malcolm; Corr, Hugh; Shepherd, Andrew; Ridout, Andrew; Laxon, Seymour; Cullen, Robert. 2013 Three-dimensional mapping by Cryosat 2 of subglacial lake volumes. Geophysical Research Letters, 40 (16). 4321-4327. https://doi.org/10.1002/grl.50689 <https://doi.org/10.1002/grl.50689> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1002/grl.50689 2023-02-04T19:37:04Z We analyze data acquired by the CryoSat-2 interferometric radar altimeter and demonstrate its novel capability to track topographic features on the Antarctic Ice Sheet. We map the perimeter and depth of a 260 km2 surface depression above an Antarctic subglacial lake (SGL) and, in combination with Ice, Cloud and land Elevation Satellite laser altimetry, chart decadal changes in SGL volume. During 2007–2008, between 4.9 and 6.4 km3 of water drained from the SGL, and peak discharge exceeded 160 m3 s−1. The flood was twice as large as any previously recorded and equivalent to ~ 10% of the meltwater generated annually beneath the ice sheet. The ice surface has since uplifted at a rate of 5.6 ± 2.8 m yr−1. Our study demonstrates the ability of CryoSat-2 to provide detailed maps of ice sheet topography, its potential to accurately measure SGL drainage events, and the contribution it can make to understanding water flow beneath Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Geophysical Research Letters 40 16 4321 4327 |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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English |
description |
We analyze data acquired by the CryoSat-2 interferometric radar altimeter and demonstrate its novel capability to track topographic features on the Antarctic Ice Sheet. We map the perimeter and depth of a 260 km2 surface depression above an Antarctic subglacial lake (SGL) and, in combination with Ice, Cloud and land Elevation Satellite laser altimetry, chart decadal changes in SGL volume. During 2007–2008, between 4.9 and 6.4 km3 of water drained from the SGL, and peak discharge exceeded 160 m3 s−1. The flood was twice as large as any previously recorded and equivalent to ~ 10% of the meltwater generated annually beneath the ice sheet. The ice surface has since uplifted at a rate of 5.6 ± 2.8 m yr−1. Our study demonstrates the ability of CryoSat-2 to provide detailed maps of ice sheet topography, its potential to accurately measure SGL drainage events, and the contribution it can make to understanding water flow beneath Antarctica. |
format |
Article in Journal/Newspaper |
author |
McMillan, Malcolm Corr, Hugh Shepherd, Andrew Ridout, Andrew Laxon, Seymour Cullen, Robert |
spellingShingle |
McMillan, Malcolm Corr, Hugh Shepherd, Andrew Ridout, Andrew Laxon, Seymour Cullen, Robert Three-dimensional mapping by Cryosat 2 of subglacial lake volumes |
author_facet |
McMillan, Malcolm Corr, Hugh Shepherd, Andrew Ridout, Andrew Laxon, Seymour Cullen, Robert |
author_sort |
McMillan, Malcolm |
title |
Three-dimensional mapping by Cryosat 2 of subglacial lake volumes |
title_short |
Three-dimensional mapping by Cryosat 2 of subglacial lake volumes |
title_full |
Three-dimensional mapping by Cryosat 2 of subglacial lake volumes |
title_fullStr |
Three-dimensional mapping by Cryosat 2 of subglacial lake volumes |
title_full_unstemmed |
Three-dimensional mapping by Cryosat 2 of subglacial lake volumes |
title_sort |
three-dimensional mapping by cryosat 2 of subglacial lake volumes |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/502072/ https://nora.nerc.ac.uk/id/eprint/502072/1/grl50689.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/502072/1/grl50689.pdf McMillan, Malcolm; Corr, Hugh; Shepherd, Andrew; Ridout, Andrew; Laxon, Seymour; Cullen, Robert. 2013 Three-dimensional mapping by Cryosat 2 of subglacial lake volumes. Geophysical Research Letters, 40 (16). 4321-4327. https://doi.org/10.1002/grl.50689 <https://doi.org/10.1002/grl.50689> |
op_doi |
https://doi.org/10.1002/grl.50689 |
container_title |
Geophysical Research Letters |
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40 |
container_issue |
16 |
container_start_page |
4321 |
op_container_end_page |
4327 |
_version_ |
1766248645863145472 |