Analysis on the microphysical features of raindrop size distribution in mountainous area Fujian

Microphysical parameters of raindrop size distribution got at Youxi from March to October 2014 were used to analyze microphysical characteristics of natural precipitations under different synoptic systems in mountainous area Fujian. When in small and moderate rain, there are large numbers of small raindrop contribute to the rainfall intensity mainly under warm convergent zone or low-vortex shear, which contains cumulus and stratus-cumulus mixing precipitation (half and half). However, the size spectrums under low-vortex shear have broadest width and obvious double-peak or multi-peak structures. The precipitations under typhoon or intertropical convergence zone are more stable with single-peak size spectrums and centralized raindrops distribution. The parameters mu and lambda meet the linear function, and they both decrease with rainfall intensity increasing.