Comparative Analysis Of Reflectivity Attenuation Correction For C-band Dual-polarization Radar

C-band dual polarization radar plays important roles on improving the accuracy of rainfall estimation, hail identification, solid precipitation distribution as well as the recognition of drop-size distribution, while the echo attention of C-band radar is still a problem to be solved. Using the data from joint-observation completed by NUIST C-band dual polarization radar and the adjacent S-band Doppler radar in July,2014, the study focuses on the ZH-KDP attenuation correction algorithm and the assessment of attenuation correction to the C-band dual polarization radar. Such assessment are based on reflectivity data comparison between C-band dual polarization radar and S-band Doppler radar. The analysis results indicate that(1) the ZH-KDP algorithm can compensate for the attenuation especially in the case of strong echo through long path. The correction is almost perfect for the reflectivity below 40dBZ, but over corrected 2-5dB for the case of strong echo above 40 dBZ.(2)ΦDP self-consistent method with constrains attenuation correction algorithms. Optimal coeffiecint of AH-KDP relationship can be got by such a self-consistent scheme, which takes the rain droplet size distribution, shape and temperature into account. The scheme produces a satisfied attenuation correction for most cases but comparatively less compenstation for echoes at far distance or behind strong echoes.