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| Titel |
Preliminary study of an intense rainfall episode in Corsica, 14 September 2006 |
| VerfasserIn |
D. Lambert, S. Argence |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Observation, Prediction and Verification of Precipitation (EGU Session 2007) ; Nr. 16 (2008-04-09), S.125-129 |
| Datensatznummer |
250013079
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| Publikation (Nr.) |
 copernicus.org/adgeo-16-125-2008.pdf |
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| Zusammenfassung |
| A preliminary study of the 14 September 2006 heavy
rainfall episode in Corsica is presented. Two sets of initial and coupling
fields were used to run the French non-hydrostatic mesoscale model, MESO-NH.
Three interactive 2-way nested domains were used, having 150×120,
150×150 and 125×200 grid points and 50 km, 10 km and 2 km mesh
sizes. 50 vertical levels were defined. From ground level to 2000 m, the
vertical resolution was 60 m, whereas it was 600 m above. Convection was
parameterized for the coarser and intermediate domains and assumed to be
explicitly resolved for the 2 km grid. At large scale, the situation is well
represented by both simulations but, at the fine scale, they present
significant differences. Comparison with the observations did not allow the
two simulations to be discriminated. Even though the main high-level
dynamical ingredients usually associated with rain storms were present in
both simulations, their fine scale evolution was not reproduced well. Near
the surface, there were significant differences between the two simulations.
Vertical motion fields associated with convective phenomena were different
in the innermost domain. A cold pool acting as a warm front off the east
coast was associated with the main rainfall area over the sea in one
simulation whereas in the second one, it seemed that the Corsican mountains
acted as a barrier, leading to inland rainfall. This preliminary study gives
perspectives for future sensitivity tests. For example, an investigation is
planned of the influence of the high level dynamics, the SST and a better
description of the orography. |
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