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| Titel |
Regional GRACE-based estimates of water mass variations over Australia: validation and interpretation |
| VerfasserIn |
L. Seoane, G. Ramillien, F. Frappart, M. Leblanc |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 12 ; Nr. 17, no. 12 (2013-12-06), S.4925-4939 |
| Datensatznummer |
250086023
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| Publikation (Nr.) |
 copernicus.org/hess-17-4925-2013.pdf |
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| Zusammenfassung |
| Time series of regional 2° × 2°
Gravity Recovery and Climate
Experiment (GRACE) solutions have been computed from 2003 to 2011 with a 10-day resolution by using an energy integral method over Australia
(112° E–156° E; 44° S–10° S). This approach uses the dynamical orbit analysis of GRACE
Level 1 measurements, and specially accurate along-track K-band range rate
(KBRR) residuals with a 1 μm s−1 level of errors, to estimate
the total water mass over continental regions. The advantages of regional
solutions are a significant reduction of GRACE aliasing errors (i.e.
north–south stripes) providing a more accurate estimation of water mass
balance for hydrological applications. In this paper, the validation of these
regional solutions over Australia is presented, as well as their ability to
describe water mass change as a response of climate forcings such as El Niño. Principal
component analysis of GRACE-derived total water storage (TWS)
maps shows spatial and temporal patterns that are consistent with independent
data sets (e.g. rainfall, climate index and in situ observations). Regional
TWS maps show higher spatial correlations with in situ water table measurements
over Murray–Darling drainage basin (80–90%), and they offer a better
localization of hydrological structures than classical GRACE global solutions
(i.e. Level 2 Groupe de Recherche en Géodésie Spatiale (GRGS)) products
and 400 km independent component analysis solutions as a linear combination
of GRACE solutions provided by different centers. |
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