A new digital elevation model of Antarctica derived from CryoSat-2 altimetry
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Published:2018-05-02
Issue:4
Volume:12
Page:1551-1562
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Slater Thomas, Shepherd Andrew, McMillan MalcolmORCID, Muir Alan, Gilbert Lin, Hogg Anna E., Konrad HannesORCID, Parrinello Tommaso
Abstract
Abstract. We present a new digital elevation model (DEM) of the Antarctic ice
sheet and ice shelves based on 2.5×108 observations
recorded by the CryoSat-2 satellite radar altimeter between
July 2010 and July 2016. The DEM is formed from spatio-temporal fits
to elevation measurements accumulated within 1, 2, and 5 km
grid cells, and is posted at the modal resolution of
1 km. Altogether, 94 % of the grounded ice sheet and
98 % of the floating ice shelves are observed, and the remaining
grid cells north of 88∘ S are interpolated using ordinary
kriging. The median and root mean square difference between the DEM
and 2.3×107 airborne laser altimeter measurements
acquired during NASA Operation IceBridge campaigns are −0.30 and
13.50 m, respectively. The DEM uncertainty rises in regions
of high slope, especially where elevation measurements were
acquired in low-resolution mode; taking this into account, we
estimate the average accuracy to be 9.5 m – a value that is
comparable to or better than that of other models derived from
satellite radar and laser altimetry.
Funder
Natural Environment Research Council
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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