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| Titel |
A simple groundwater scheme in the TRIP river routing model: global off-line evaluation against GRACE terrestrial water storage estimates and observed river discharges |
| VerfasserIn |
J.-P. Vergnes, B. Decharme |
| 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 ; 16, no. 10 ; Nr. 16, no. 10 (2012-10-30), S.3889-3908 |
| Datensatznummer |
250013535
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| Publikation (Nr.) |
 copernicus.org/hess-16-3889-2012.pdf |
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| Zusammenfassung |
| Groundwater is a non-negligible component of the global hydrological cycle,
and its interaction with overlying unsaturated zones can influence water
and energy fluxes between the land surface and the atmosphere. Despite its
importance, groundwater is not yet represented in most climate models. In
this paper, the simple groundwater scheme implemented in the Total Runoff
Integrating Pathways (TRIP) river routing model is applied in off-line mode
at global scale using a 0.5° model resolution. The simulated river
discharges are evaluated against a large dataset of about 3500 gauging
stations compiled from the Global Data Runoff Center (GRDC) and other
sources, while the terrestrial water storage (TWS) variations derived from
the Gravity Recovery and Climate Experiment (GRACE) satellite mission help
to evaluate the simulated TWS. The forcing fields (surface runoff and deep
drainage) come from an independent simulation of the Interactions between
Soil-Biosphere-Atmosphere (ISBA) land surface model
covering the period from 1950 to 2008. Results show that groundwater
improves the efficiency scores for about 70% of the gauging stations and
deteriorates them for 15%. The simulated TWS are also in better
agreement with the GRACE estimates. These results are mainly explained by
the lag introduced by the low-frequency variations of groundwater, which
tend to shift and smooth the simulated river discharges and TWS. A
sensitivity study on the global precipitation forcing used in ISBA to
produce the forcing fields is also proposed. It shows that the groundwater
scheme is not influenced by the uncertainties in precipitation data. |
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