江淮流域持续性暴雨过程水汽输送状况初析

选取江淮流域5个持续性暴雨过程，利用NCAR／NCEP再分析资料对水汽通量进行分析，结合HYSPLIT模式中空气质点倒退运动轨迹的计算，揭示此类强降水事件中海量水汽的源地、输送通道的统计特征和通道建立的天气系统条件：水汽多起源于南印度洋低纬度地区，越赤道气流、阿拉伯海急流、孟加拉湾急流和我国东南沿海低空急流在输送过程不同时期对于输送路径的形成起了重要的作用，同时亚洲夏季风系统的印度季风低压和西太平洋副热带高压的强度和位置也影响着输送路径．并在此基础上，提出了一个形成该类过程的水汽输送条件的初步概念模型．

Primary analysis on vapor transport of persistent heavy rainfall events over the Yangtze and Huaihe River valley

The water vapor transport of five most severe persistent heavy rainfall (PHR) events over the Yangtze and Huaihe River valley has been analyzed by calculating backward trajectory and examining the variation of water vapor flux during a 12-day period before the events. The results reveal the main source and the major transport pathways of the water vapor. The main source of the water vapor is located in the tropical southern Indian Ocean. The cross-equator flow and low-level jets of Arabian Sea,Bay of Bengal...