An analytical representation of raindrop size distribution in a mixed convective and stratiform precipitating system as revealed by field observations

This study investigated a rainfall event under typhoon influence using 2D video disdrometer and weather radar observations to characterize raindrop size distribution (DSD) in mixed convective stratiform precipitating system. During the time period when both rainfalls existed, DSDs generally indicated monotonically decreasing shape with increasing particle size, relatively gradual decrease at intermediate observed certain times; this feature is attributed combined effect of rainfalls. transitional between rainfalls, exhibited bimodal shape. The were well approximated by newly proposed gamma exponential (GRACE) function, which was defined as sum distribution. A comparison volume ratio components GRACE revealed that component DSD larger than DSD. These results suggest became during predominated because weakening rainfall. useful for understanding cloud-microphysical processes precipitation conditions.