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| Titel |
Reconstruction of reflectivity vertical profiles and data quality control for C-band radar rainfall estimation |
| VerfasserIn |
A. Fornasiero, P. P. Alberoni, G. Vulpiani, F. S. Marzano |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 6th Plinius Conference on Mediterranean Storms (2004) ; Nr. 2 (2005-06-08), S.209-215 |
| Datensatznummer |
250000322
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| Publikation (Nr.) |
 copernicus.org/adgeo-2-209-2005.pdf |
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| Zusammenfassung |
| Microwave Doppler radars are considered a fairly
established technique to retrieve rain rate fields from measured
reflectivity volumes. However, in a complex orographic environment radar
observations are affected by several impairments which should be carefully
evaluated. Together with the enhancement of ground-clutter effects, the
major limitation is represented by partial or total beam blocking caused by
natural obstructions which very often impose to scan at high-elevation
angles. These range-related limitations tend to reduce the potential role of
operational weather radars in monitoring precipitation amount at ground
within mountainous areas since, if either the nature or intensity of
rainfall varies with height (e.g., melting effects during stratiform rain),
radar returns at higher altitudes may be not representative of surface rain
rate. Therefore, before to use the radar data, it is necessary to reduce, as
much as possible, this evaluation errors and to estimate the reliability of
the processed data. Near to the quality control, are needed quality indexes,
taking into account each correction and elaboration step, that could be
useful to retrieve a final quality value. In this work, we analyse the main
factors that could be affect the efficiency of a reconstruction methodology
of near-surface reflectivity fields from high-elevation reflectivity bins,
in presence of complex orography. A climatologic schema is applied to infer
near-surface reflectivity at a given range interval. The technique is
developed in polar coordinates partially taking into account the antenna
beam width degradation at longer ranges and overall computational efficiency
for operational purposes. Thereafter, it is applied on a rainfall event
observed by a C-band Doppler radar operating in S. Pietro Capofiume
(Bologna, Italy) and the relation between the reconstruction error and
possible quality indicators is analysed and discussed. |
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