C-Band Polarization Radar Data Preprocessing and Its Application to Rainfall Estimation

WEI Qing;HU Zhiqun;LIU Liping;WU Linlin

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Plateau Meteorology
Plateau Meteorology ›› 2016, Vol. 35 ›› Issue (1) : 231-243. DOI: 10.7522/j.issn.1000-0534.2014.00131

C-Band Polarization Radar Data Preprocessing and Its Application to Rainfall Estimation

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Abstract

Radar data processing method and qualitative precipitation estimation are tested based on the data observed at Dingyuan,Anhui Province in June and July 2013 with a C-band polarization radar(PCDJ) which is one of the instrument of Anhui Weather Modification Office.After filtered by median filter and wavelet analysis method respectively,the differential propagation phase shift ΦDP data filtered by wavelet analysis can significantly improve ΦDP data quality.The specific differential propagation phase shift KDP is estimated from ΦDP by least-square fitting approaches in 1.5~4.0 km resolution.ΦDP data filtered by wavelet analysis is more continuous and smooth.And the result of ΦDP data filtered by wavelet analysis applied to precipitation estimation is better.The attenuation of ZH in rain area is corrected by KDP which is estimated from ΦDP data filtered by wavelet analysis,and the corrected ZH values of PCDJ radar are smaller than SA's.Combining with hourly rainfall gauge,the comparison analysis were made between the rain rates estimated from PCDJ and SA.The results suggest that the rain rates estimated from i>R(ZH,KDP) are more accurate than those from i>R(ZH) when the rain rates are greater than 5 mm·h-1,but less accurate when the rain rates are smaller than 5 mm·h-1.In addition,SA radar rain rates estimated from i>R(ZH) is more accurate than PCDJ radar's.Also,PCDJ radar rain rates estimated from i>R(ZH,KDP) can further improve the accuracy than SA radar when the rain rates are greater than 5 mm·h-1.

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C-band polarization / Data optimization / Specific differentia / Rainfall estimation

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WEI Qing , HU Zhiqun , LIU Liping , WU Linlin. C-Band Polarization Radar Data Preprocessing and Its Application to Rainfall Estimation. Plateau Meteorology. 2016, 35(1): 231-243 https://doi.org/10.7522/j.issn.1000-0534.2014.00131

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