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Analysis of the Cause of Precipitation Difference Induced by the Typhoons “Jelawat” and “Haiku” with Similar Tracks

Chen Yunhui;Wan Ming;Wu Fan;Tang Chunyan;Qian Xuecheng;Jiangxi Provincial Meteorological Observatory;Jiangxi Provincial Meteorological Service Center;  
The conventional data, satellite cloud image and NECP(1°×1°) reanalysis data were employed to analyze the cause of precipitation difference induced by the Typhoon Jelawat(0008) and Typhoon Haikui(1211) with similar tracks. The result showed that the difference intensity of precipitation was caused mainly by the maintenance time and intensity of the typhoon circulations.Short maintenance time and weak intensity after landing led to less precipitation, and vice versa. The maintenance time of typhoon and precipitation intensity were affected by its circulation and the position of subtropical high before and after landing. The typhoon was connected with the maritime monsoon airflow, strong ascending motion and slow-moving speed caused by the strong low-level circulation, which had an important impact on typhoon rainfall. Also, the rainfall had an important relationship with the blocking of water vapor channel. Water vapor inflow from the south and west border was corresponding to the precipitation of typhoon.
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