A squall line process as the research object which occurs on 20 May 2013,at Sanshui in Guangdong has been selected.Firstly,the precipitation process is divided into three stages by the distribution of radar echo over time and height and the characteristics when the squall line moving towards Sanshui.Secondly,analyzing the change of the raindrop spectrum in this precipitation by calculating the number density of total particles、the median diameter and peak number.Thirdly,stating the relationships between echo and precipitation intensity in the whole process and the grading process respectively according to the data of raindrop spectrum,then discussing the influence of raindrop spectrum's change and radar echo on the rainfall estimation.The following conclusions have been given:The median diameter in stages of convective cloud precipitation is basically in line with stratiform cloud precipitation stages,but its number density is much greater.Convective cloud precipitation phase is given priority to two peaks,and when the precipitation reaches to a stratiform one,the ratio of multi-peak spectrum is increasing.Radar echo is often less than the reflectivity calculated by HSC-OTT Parsivel,their correlation increases with descent height.Between the relationship of echo and precipitation intensity,b fluctuates within the range of 1~2,however,a has major fluctuation,especially when the convective cloud precipitation stages progressing towards stratiform clouds,a value increases and b value decreases;Then a segmented relationship between echo and precipitation intensity is defined according to the characteristics of three stages,the precipitation's inversion of segmented relationship is much better,the relative error given by raindrop spectrum is minimal in the period of transition,but the inversion accuracy in stratiform cloud precipitation stages is higher than convective clouds,which bears on the rapid and dramatic changes of convective clouds raindrop spectrum and its rainfall intensity;In the aspect of radar observations,the precipitation inversion of segmented relationship is better,the deviation caused by radar is smaller in convective clouds,but this value will be higher when the type of precipitation transits to stratiform clouds,which is mainly due to the the minimum error between the distrometer and radar in the phase of convection,the differences of two instruments on time and height,the precision of radar observation and the changes of raindrops spectrum also have important influence on rainfall estimation.
Key words
Raindrop size distri /
Z-R relatio /
Precipitation estima
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