Speculation on the water vapor source of precipitation in Hainan Island

According to the official website: Water vapor transport is one of the key factors in typhoon precipitation. Deng Guo et al. analyzed the water vapor transport characteristics of Typhoon No. 9914 Dan and showed that the typhoon moves westward with the subtropical high pressure to the south. The water vapor is mainly transported from the east, and after moving northward, it is transferred to the water vapor supply of the South China Sea. The water vapor transport is mainly concentrated in the middle and lower troposphere, generally at 925hPa. The water vapor flux divergence convergence field in this layer indicates the heavy precipitation area. It works better. This indicator more accurately determines the occurrence range of the "Morakot" heavy rain in 2009 and the extreme center of heavy precipitation. The article uses the Lagrangian trajectory model to track the typhoon water vapor transport path, combined with the air parcel tracking analysis method, to quantitatively analyze the impact on Hainan, China. Typhoon precipitation water vapor transport and source characteristics of the island.