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

被引：54

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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2013年 / 40卷 / 16期

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

页码：4321 / 4327

页数：7

共 25 条

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[Anonymous], GLAS ICESAT L2 ANTAR

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