Abstract:Based on the observation of Parsivel disdrometer at Shangqiu Station in Henan Province, Feicheng and Shouguang stations in Shandong Province, Lushun and Changhai stations in Liaoning Province, the raindrop size distributions of Typhoon Rumbia after landfall in 2018 are analyzed. The results show that Shangqiu, Feicheng and Shouguang stations have the similar characteristics of the average raindrop size distribution at different rain intensities with high concentration of small raindrops and low concentration of large raindrops, and part of the average drop size distributions have the characteristics of balanced raindrop size distributions. On the contrary, the average raindrop size distributions at Lushun and Changhai stations have low concentration of small raindrops and high concentration of large raindrops, and the average raindrop size distribution is controlled by ice phase. The Z-R relation of Shangqiu, Feicheng and Shouguang stations are similar, and the Z-R relation between Lushun and Changhai is similar. There is a great difference in indexes between the two types, indicating that the microphysical characteristics of precipitation are obviously different.The parameter of normalized Gamma distribution of raindrop size distribution shows that the convective precipitations in Shangqiu, Feicheng and Shouguang have the characteristics of maritime raindrop size distribution, and the microphysical processes are mainly of warm rain process, which is dominated by the coalescence growth, and the mixing of warm rain and ice phase. By contrast, the convective precipitations at Lushun and Changhai stations have the characteristics of continental raindrop size distribution, and the microphysical processes are predominated by the ice phase and the mixing of warm rain and ice phase.The above analyses indicate that although the Typhoon Rumbia in Henan and Shandong provinces were affected by cold air continuously, there was no obvious change in the microphysical characteristics, the cloud microphysical process changed significantly after it weakened into an extratropical cyclone.