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| Titel |
Global modelling of continental water storage changes – sensitivity to different climate data sets |
| VerfasserIn |
K. Fiedler, P. Döll |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Large-scale hydrological modelling and the European Union water policies ; Nr. 11 (2007-06-11), S.63-68 |
| Datensatznummer |
250009010
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| Publikation (Nr.) |
 copernicus.org/adgeo-11-63-2007.pdf |
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| Zusammenfassung |
| Since 2002, the GRACE satellite mission provides estimates of the Earth's
dynamic gravity field with unprecedented accuracy. Differences between
monthly gravity fields contain a clear hydrological signal due to
continental water storage changes. In order to evaluate GRACE results, the
state-of-the-art WaterGAP Global Hydrological Model (WGHM) is applied to
calculate terrestrial water storage changes on a global scale. WGHM is
driven by different climate data sets to analyse especially the influence of
different precipitation data on calculated water storage. The data sets used
are the CRU TS 2.1 climate data set, the GPCC Full Data Product for
precipitation and data from the ECMWF integrated forecast system. A simple
approach for precipitation correction is introduced. WGHM results are then
compared with GRACE data. The use of different precipitation data sets leads
to considerable differences in computed water storage change for a large
number of river basins. Comparing model results with GRACE observations
shows a good spatial correlation and also a good agreement in phase.
However, seasonal variations of water storage as derived from GRACE tend to
be significantly larger than those computed by WGHM, regardless of which
climate data set is used. |
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