Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes
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...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2013
|
Subjects: | |
Online Access: | https://eprints.lancs.ac.uk/id/eprint/128844/ https://doi.org/10.1002/grl.50689 |
id |
ftulancaster:oai:eprints.lancs.ac.uk:128844 |
---|---|
record_format |
openpolar |
spelling |
ftulancaster:oai:eprints.lancs.ac.uk:128844 2023-08-27T04:06:15+02:00 Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes McMillan, Malcolm Corr, Hugh Shepherd, Andrew Ridout, Andrew Laxon, Seymour Cullen, Robert 2013-08-28 https://eprints.lancs.ac.uk/id/eprint/128844/ https://doi.org/10.1002/grl.50689 unknown McMillan, Malcolm and Corr, Hugh and Shepherd, Andrew and Ridout, Andrew and Laxon, Seymour and Cullen, Robert (2013) Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes. Geophysical Research Letters, 40 (16). pp. 4321-4327. ISSN 0094-8276 Journal Article PeerReviewed 2013 ftulancaster https://doi.org/10.1002/grl.50689 2023-08-03T22:34:21Z 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. Key Points Assessment of novel CryoSat-2 interferometric altimetry over land ice Demonstration of interferometric capability to track off-nadir topography Mapping of largest Antarctic subglacial lake drainage event observed to date. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Lancaster University: Lancaster Eprints Antarctic The Antarctic Geophysical Research Letters 40 16 4321 4327 |
institution |
Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
unknown |
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. Key Points Assessment of novel CryoSat-2 interferometric altimetry over land ice Demonstration of interferometric capability to track off-nadir topography Mapping of largest Antarctic subglacial lake drainage event observed to date. |
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 volume changes |
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 volume changes |
title_short |
Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes |
title_full |
Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes |
title_fullStr |
Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes |
title_full_unstemmed |
Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes |
title_sort |
three-dimensional mapping by cryosat-2 of subglacial lake volume changes |
publishDate |
2013 |
url |
https://eprints.lancs.ac.uk/id/eprint/128844/ https://doi.org/10.1002/grl.50689 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_relation |
McMillan, Malcolm and Corr, Hugh and Shepherd, Andrew and Ridout, Andrew and Laxon, Seymour and Cullen, Robert (2013) Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes. Geophysical Research Letters, 40 (16). pp. 4321-4327. ISSN 0094-8276 |
op_doi |
https://doi.org/10.1002/grl.50689 |
container_title |
Geophysical Research Letters |
container_volume |
40 |
container_issue |
16 |
container_start_page |
4321 |
op_container_end_page |
4327 |
_version_ |
1775347064910118912 |