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| Titel |
Constraining GRACE-derived cryosphere-attributed signal to irregularly shaped ice-covered areas |
| VerfasserIn |
W. Colgan, S. Luthcke, W. Abdalati, M. Citterio |
| 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 ; 7, no. 6 ; Nr. 7, no. 6 (2013-12-17), S.1901-1914 |
| Datensatznummer |
250085192
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| Publikation (Nr.) |
 copernicus.org/tc-7-1901-2013.pdf |
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| Zusammenfassung |
| We use a Monte Carlo approach to invert a spherical harmonic representation
of cryosphere-attributed mass change in order to infer the most likely
underlying mass changes within irregularly shaped ice-covered areas at
nominal 26 km resolution. By inverting a spherical harmonic representation
through the incorporation of additional fractional ice coverage information,
this approach seeks to eliminate signal leakage between non-ice-covered and ice-covered
areas. The spherical harmonic representation suggests a Greenland mass loss
of 251 ± 25 Gt a−1 over the December 2003 to December 2010 period. The inversion
suggests 218 ± 20 Gt a−1 was due to the ice sheet proper, and 34 ± 5 Gt a−1
(or ~14%) was due to Greenland peripheral glaciers
and ice caps (GrPGICs). This mass loss from GrPGICs exceeds that inferred from
all ice masses on both Ellesmere and Devon islands combined. This partition
therefore highlights that GRACE-derived "Greenland" mass loss cannot be
taken as synonymous with "Greenland ice sheet" mass loss when making
comparisons with estimates of ice sheet mass balance derived from techniques
that sample only the ice sheet proper. |
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