During the Third Qinghai-Tibetan Plateau Atmospheric Scientific Experiment Ⅲ, the precipitation clouds in Nagqu, Tibet was continuously detected with C-FMCW radar from July to August 2014.The dataset gained was then analyzed, as a consequences of which, 37 convective clouds is obtained; further, 13 characteristic parameters were extracted, including Convective Index (difference of updafts and downdrafts, CI), the maximum cloud top(Hctop), the maximum height of 35 dBZ (Hz35), the maximum reflectivity (Zmax), etc.The cluster analysis method was applied for categorization of all these characteristic parameter in terms of deep and shallow convective cloud.From which, it is found that the parameters of Hctop and Hz35 are most favorable for the classification, with a similarity of more than 0.8 to that of CI.In addition, the parameters of CI, Hz35 and Hctop, which are in possession of relatively excellent consistency, were employed for a cluster analysis, then the 37 clouds were identified as 9 deep convective precipitation clouds and 28 shallow convective precipitation clouds.For the deep convective clouds, the maximum of CI is up to 33 m·s-1, as well as maximum Hctop of 12.5 km and Hz35 of higher than 5 km(above ground level, hereinafter the same).While, for the shallow convective precipitation clouds, the average of CI and Hctop are 14 m·s-1and 2.5 km, respectively.In the deep convective clouds, a steady layer similar to the Bright Band often appeared at the height of about 0.8~1.5km, which is however not applicable to the shallow convective clouds.Based on the C-FMCW radar, it is believed that the horizontal distribution of the deep convective clouds was mainly manifested as organizing multi-monomer into convective precipitation system, and shallow convective clouds showed a distribution like individual scattering popcorn.The 9 deep convection clouds resulted in a accumulated ground rainfall of 82.7 mm, accounting for 28% of the whole rainfall of the very two months, and sometimes it was accompanied by hail.On the contrast, all 28 shallow convective clouds only generated an accumulation of ground rainfall of 28.7 mm, which is far less than that of the deep convection rainfall contribution.
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