Polarimetric X-band weather radar measurements in the tropics: radome and rain attenuation correction (Articolo in rivista)

Type
Label
  • Polarimetric X-band weather radar measurements in the tropics: radome and rain attenuation correction (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.5194/amt-5-2183-2012 (literal)
Alternative label
  • M. Schneebeli1,2,*, J. Sakuragi1, T. Biscaro1, C. F. Angelis1, I. Carvalho da Costa1, C. Morales3, L. Baldini4, and L. A. T. Machado1 (2012)
    Polarimetric X-band weather radar measurements in the tropics: radome and rain attenuation correction
    in Atmospheric measurement techniques (Internet)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Schneebeli1,2,*, J. Sakuragi1, T. Biscaro1, C. F. Angelis1, I. Carvalho da Costa1, C. Morales3, L. Baldini4, and L. A. T. Machado1 (literal)
Pagina inizio
  • 2183 (literal)
Pagina fine
  • 2199 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.atmos-meas-tech.net/5/2183/2012/amt-5-2183-2012.html (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 5 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 17 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Google Scholar (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1Instituto Nacional de Pesquisas Espaciais (INPE), Centro de Previsão de Tempo e Estudos Climáticos (CPTEC), Cachoeira Paulista, Brazil 2École Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering (ENAC), Lausanne, Switzerland 3Instituto de Astronomia, Geofisica e Ciéncias Atmosféricas, Universidade de São Paulo, São Paulo, Brazil 4Instituto di Scienze dell'Atmosfera e del Clima (CNR), Rome, Italy *now at: MeteoSwiss, Radar and Satellites, Locarno, Switzerland (literal)
Titolo
  • Polarimetric X-band weather radar measurements in the tropics: radome and rain attenuation correction (literal)
Abstract
  • 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. (literal)
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