In order to analyze the characteristics of different types of precipitation in mid-latitude regions,the precipitation data have been divided into shallow convection,shallow stratiform,deep convection,deep stratiform and transition five types of precipitation based on spectral parameter(echo intensity,velocity,spectral width)of wind profile radar.The shallow convection and shallow stratiform precipitation belong to the category of warm rain,and the deep convection,deep stratiform and transition precipitation belong to the category of cold rain.In this paper,author classified and analyzed the characteristics of precipitation weather process in Beijing Yanqing during 2012 and 2013 summer(from May to October)with the above-mentioned classification scheme.The results show that,warm rain is an important part of precipitation in Beijing summer,accounted for 26%,its precipitation proportion takes 17%;cold rain accounted for 74%,the precipitation proportion takes 83%.A majority of the precipitation in Beijing summer is transition precipitation(47%),followed by stratiform precipitation,accounted for 43%,the lest is convection precipitation,takes 10%;the greatest contribution of precipitation is convection precipitation,followed by transition precipitation,the lest is stratiform precipitation.Characteristics of all types of precipitation are summarized: the variation of spectral parameters in shallow stratiform precipitation with altitude is not obvious,the whole trend smooth relatively;the variation of shallow convection is fiercer than shallow stratiform,it increases obviously at 3 km,and the number of precipitation data is increasing rapidly with altitude descent;spectral parameters of deep convection precipitation are distributed widely,especially the spectral width,is broader than that of other types,besides,the high value area is also exist in high altitude;deep stratiform precipitation echo presenting a uniform bright band distribution,velocity and spectral width comes out a strong gradient feature near zero layer;transition precipitation possess characteristics of both convection and stratiform precipitation,the echo distribution is similar to deep convection precipitation, but the distribution of velocity and spectral width is similar to deep stratiform precipitation.With the classification statistics on summer precipitation in Beijing,it can have a deeper understanding in precipitation system in Beijing,improving the prediction accuracy and working efficiency of weather modification.
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