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| Titel |
Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2 |
| VerfasserIn |
V. Helm, A. Humbert, H. Miller  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 4 ; Nr. 8, no. 4 (2014-08-20), S.1539-1559 |
| Datensatznummer |
250116266
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| Publikation (Nr.) |
 copernicus.org/tc-8-1539-2014.pdf |
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| Zusammenfassung |
| This study focuses on the present-day surface elevation of the Greenland and
Antarctic ice sheets. Based on 3 years of CryoSat-2 data acquisition
we derived new elevation models (DEMs) as well as elevation change maps and
volume change estimates for both ice sheets. Here we present the new DEMs and
their corresponding error maps. The accuracy of the derived DEMs for
Greenland and Antarctica is similar to those of previous DEMs obtained by
satellite-based laser and radar altimeters. Comparisons with ICESat data show
that 80% of the CryoSat-2 DEMs have an uncertainty of less than
3 m ± 15 m. The surface elevation change rates between
January 2011 and January 2014 are presented for both ice sheets. We compared
our results to elevation change rates obtained from ICESat data covering the
time period from 2003 to 2009. The comparison reveals that in West Antarctica
the volume loss has increased by a factor of 3. It also shows an anomalous
thickening in Dronning Maud Land, East Antarctica which represents a known
large-scale accumulation event. This anomaly partly compensates for the
observed increased volume loss of the Antarctic Peninsula and West
Antarctica. For Greenland we find a volume loss increased by a factor of 2.5
compared to the ICESat period with large negative elevation changes
concentrated at the west and southeast coasts. The combined volume change of
Greenland and Antarctica for the observation period is estimated to be −503
± 107 km3 yr−1. Greenland contributes nearly 75% to the
total volume change with −375 ± 24 km3 yr−1. |
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