The operational weather radar of Fossalon di Grado (Gorizia, Italy): accuracy of reflectivity and differential reflectivity measurements |
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Authors: | R Bechini E Gorgucci G Scarchilli S Dietrich |
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Institution: | (1) Osservatorio Meteorologico Regionale, Centro Radar Meteorologico (ARPA Friuli-Venezia Giulia), Fossalon di Grado, Italy, IT;(2) Instituto di Fisica dell’Atmosfera (CNR), Roma, Italy, IT |
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Abstract: | Summary The error structure of radar measurements should be accurately known in order to provide reliable estimates for a number
of quantitative meteorological applications, from rainfall rate estimation to cloud microphysics. The aim of this paper is
to give a detailed characterization of Z
H
and Z
DR
measurements obtained by the weather radar of Fossalon di Grado (Gorizia, Italy). Vertical-looking observations are used
to determine the system bias on differential reflectivity and to estimate the measurement error on both Z
H
and Z
DR
in the rain medium. It is estimated that no bias is affecting Z
DR
and the accuracy of Z
H
and Z
DR
is 0.8 and 0.1 dB, respectively. A similar evaluation is done in the rain medium at larger ranges with the antenna pointing
at low elevation angles. The long time stability of the absolute reflectivity calibration is also established by radar-rain
gage inter-comparison over almost 200 hours of precipitation data collected during nearly two years.
Received June 21, 2001 Revised November 13, 2001 |
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Keywords: | |
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