The data obtained from vertical radar can give better understanding of the microphysical processes inside precipitation cloud. A direct method of precipitation echo spectrum parameters estimate raindrop parameters is presented. Assumed the raindrop distribution is Gamma distribution, via radar meteorological equation, the relationship of raindrop terminal velocity and the diameter, exported the relationship of radar precipitation echo spectrum parameters and raindrop parameters. Using implicit functions explicit and series expansions to solve the equation, obtained approximate solution of the precipitation echo spectrum parameters estimate the raindrop parameters. Using forward method to establish testing database, verify the accuracy of approximate solution intercept parameter mean average relative error is 0.83%, slope parameter mean average relative error is 3.04%, and shape parameter mean average relative error is 13.60%. Test results show that the estimation method is feasible. Radar data of a precipitation event in Tengchong, Yunnan Province on 22-23 July 2012 is used to estimate the raindrop size parameters, and compared with terrestrial laser spectrometer obtained average diameter of the results, the results relatively consistency. This method of retrieving Gamma parameters is suit for straitiform precipitation cloud.
RUAN Zheng
,
LIU Chuyi
,
MA Jianli
,
JIN Long
. Research of Retrieving Gamma parameters in Precipitation Cloud from Data Obtained of Vertical Radar[J]. Plateau Meteorology, 2015
, 34(4)
: 1019
-1028
.
DOI: 10.7522/j.issn.1000-0534.2014.00037
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