Three-dimensional mapping by CryoSat-2 of subglacial lake volume changes

被引:51
作者
McMillan, Malcolm [1 ]
Corr, Hugh [2 ]
Shepherd, Andrew [1 ]
Ridout, Andrew [3 ]
Laxon, Seymour [3 ]
Cullen, Robert [4 ]
机构
[1] Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
[2] British Antarctic Survey, Cambridge CB3 0ET, England
[3] UCL, Dept Earth Sci, London, England
[4] European Space Agcy, NL-2200 AG Noordwijk, Netherlands
关键词
CryoSat-2; radar altimetry; SARin; Antarctica; subglacial lake; ICESat; MACAYEAL ICE STREAM; WEST ANTARCTICA; SHEET; INVENTORY; DISCHARGE; ALTIMETRY; SYSTEM; FLOODS; OCEAN;
D O I
10.1002/grl.50689
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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 260km(2) 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 6.4km(3) of water drained from the SGL, and peak discharge exceeded 160m(3)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 5.62.8myr(-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.
引用
收藏
页码:4321 / 4327
页数:7
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