台风“山竹”期间粤北降水水汽来源解析

The Analysis of Water Vapor Source of the Precipitation of Typhoon “Shanzhu” in North Guangdong on the Lagrangian Method

我国华南地区台风降水显著,但在厄尔尼诺状态下生成的台风降水水汽来源和作用机理认识仍不够清晰。以台风“山竹”为研究对象,基于实测降水数据,结合水汽输送通量和HYSPLIT后向水汽轨迹模拟,研究台风期间粤北水汽来源情况和作用机理。结合降水变化特征、水汽输送通量和模拟水汽轨迹,综合分析确定台风“山竹”期间粤北降水的主要水汽来源是西南方向带来的太平洋水汽。

Typhoon precipitation is conspicuous in South China, but the understanding of the change process and influence mechanism of precipitation in typhoon generated in the El Nino state weather are not clear. This study took typhoon Shanzhu as a research subject, based on measured precipitation data, the characteristics of typhoon precipitation and their influencing factors in North Guangdong were studied combining the water vapor transport flux and HYSPLIT backward water vapor trajectory simulation. Based on the comprehensive analysis of precipitation, water vapor transport flux, and simulated water vapor trajectory, it was determined that the main water vapor source of typhoon Shanzhu precipitation in North Guangdong was the southwest Pacific water vapor.