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| Titel |
Polarimetric X-band weather radar measurements in the tropics: radome and rain attenuation correction |
| VerfasserIn |
M. Schneebeli, J. Sakuragi, T. Biscaro, C. F. Angelis, I. Carvalho da Costa, C. Morales, L. Baldini, L. A. T. Machado |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 9 ; Nr. 5, no. 9 (2012-09-10), S.2183-2199 |
| Datensatznummer |
250003085
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| Publikation (Nr.) |
 copernicus.org/amt-5-2183-2012.pdf |
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| Zusammenfassung |
| A polarimetric X-band radar has been deployed during one month (April 2011)
for a field campaign in Fortaleza, Brazil, together with three additional
laser disdrometers. The disdrometers are capable of measuring the raindrop
size distributions (DSDs), hence making it possible to forward-model
theoretical polarimetric X-band radar observables at the point where the
instruments are located. This set-up allows to thoroughly test the accuracy
of the X-band radar measurements as well as the algorithms that are used to
correct the radar data for radome and rain attenuation. For the campaign in
Fortaleza it was found that radome attenuation dominantly affects the
measurements. With an algorithm that is based on the self-consistency of the
polarimetric observables, the radome induced reflectivity offset was
estimated. Offset corrected measurements were then further corrected for rain
attenuation with two different schemes. The performance of the
post-processing steps was analyzed by comparing the data with
disdrometer-inferred polarimetric variables that were measured at a distance
of 20 km from the radar. Radome attenuation reached values up to 14 dB which
was found to be consistent with an empirical radome attenuation vs. rain
intensity relation that was previously developed for the same radar type. In
contrast to previous work, our results suggest that radome attenuation should
be estimated individually for every view direction of the radar in order to
obtain homogenous reflectivity fields. |
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