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| Titel |
Intercomparison of simulations using 5 WRF microphysical schemes with dual-Polarization data for a German squall line |
| VerfasserIn |
W. A. Gallus, M. Pfeifer |
| 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.109-116 |
| Datensatznummer |
250013077
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| Publikation (Nr.) |
 copernicus.org/adgeo-16-109-2008.pdf |
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| Zusammenfassung |
| Simulations of a squall line system which occurred on 12 August 2004 near
Munich, Germany are performed using a fine grid version of the Weather
Research and Forecasting (WRF) model with five different microphysical
schemes. Synthetic dual polarization observations are created from the model
output and compared with detailed observations gathered by the DLR
polarimetric radar POLDIRAD located near Munich. Synthetic polarimetric
radar scans are derived from the model forecasts employing the polarimetric
radar forward operator SynPolRad. Evaluations of the microphysical
parameterization schemes are carried out comparing Plan Position Indicator
(PPI) and Range Height Indicator (RHI) scans of reflectivity and the spatial
distribution of hydrometeor types. The hydrometeor types are derived
applying a hydrometeor classification scheme to the observed and simulated
polarimetric radar quantities. Furthermore, the Ebert-McBride contiguous
rain area method of verification is tested in a variety of ways on the
reflectivity output from the simulations. It is found that all five schemes
overestimate reflectivity in the domain, particularly in the stratiform
region of the convective system. All four schemes including graupel as a
hydrometeor type produce too much of it. Differences are seen among the
schemes in their depiction of reflectivity in the convective line and their
representation of radar bright bands. |
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