STUDY ON RAINFALL MEASUREMENT AND RAINDROP SPECTRA WITH THE DIFFERENTIAL REFLECTIVITY Z_DR TECHNIQUE OF A DUAL LINEAR POLARIZATION RADAR^*

In this paper,it is shown that the differential reflectivity ZDR is related to drop size distribution (DSD) and the spectral shape variation of different truncated diameters.ZDR is a sensitive function to variation of DSD of the spectra.The effects of shape variation of DSD on rainfall can be deduced with a (ZH,ZDR) dual-parameter technique,which is effective to improve the accuracy of rainfall measurement and is of the priority of identifying large particles of hydrometeors (especially hailstone) from the rain region.