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| Titel |
Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance |
| VerfasserIn |
J. A. Bonin, D. P. Chambers |
| 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 ; 9, no. 5 ; Nr. 9, no. 5 (2015-09-04), S.1761-1772 |
| Datensatznummer |
250116847
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| Publikation (Nr.) |
 copernicus.org/tc-9-1761-2015.pdf |
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| Zusammenfassung |
| Mass change over Greenland can be caused by either changes in the glacial
dynamic mass balance (DMB) or the surface mass balance (SMB). The GRACE
satellite gravity mission cannot directly separate the two physical causes
because it measures the sum of the entire mass column with limited spatial
resolution. We demonstrate one theoretical way to indirectly separate
cumulative SMB from DMB with GRACE, using a least squares inversion
technique with knowledge of the location of the glaciers. However, we find
that the limited 60 × 60 spherical harmonic representation of current GRACE
data does not provide sufficient resolution to adequately accomplish the
task. We determine that at a maximum degree/order of 90 × 90 or above, a
noise-free gravity measurement could theoretically separate the SMB from DMB
signals. However, current GRACE satellite errors are too large at present to
separate the signals. A noise reduction of a factor of 10 at a resolution of
90 × 90 would provide the accuracy needed for the interannual cumulative SMB
and DMB to be accurately separated. |
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