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| Titel |
Mesoscale GPS Zenith Delay assimilation during a Mediterranean heavy precipitation event |
| VerfasserIn |
X. Yan, V. Ducrocq, P. Poli, G. Jaubert, A. Walpersdorf |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 9th EGU Plinius Conference on Mediterranean Storms (2007) ; Nr. 17 (2008-07-29), S.71-77 |
| Datensatznummer |
250013627
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| Publikation (Nr.) |
 copernicus.org/adgeo-17-71-2008.pdf |
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| Zusammenfassung |
| The impact of assimilating Zenith Total delay (ZTD) observations
from a mesoscale ground-based GPS network over Western Europe is evaluated for
the heavy precipitation event of 5–9 September 2005 over Southern France. The ZTD
assimilation is performed using a three dimensional variational data assimilation
system at the 9.5-km horizontal resolution. Then using as initial conditions the 3DVAR analyses
with and without assimilation of ZTD, we perform 2.4-km non-hydrostatic MESO-NH simulations.
The results of the fine-scale simulations indicate that assimilation of ZTD help to improve the
forecast of the tropospheric water vapour content and the quantitative precipitation forecast.
We have also assessed through single observation experiments the influence of the formulation of
the observation operator which is used to compute the model equivalent ZTD. |
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