影响贵州低频强降水的主要气象因子特征

本文基于贵州低频降水和东亚水汽输送路径,对比分析低频降水多少年的水汽差异和先兆海温差异,得到主要结论有：（1）7月开始在欧亚大陆的中纬度地区开始形成“两槽一脊”的环流形势;8、9月“两槽一脊”环流形势稳固。副热带高压的西伸脊点位于120oE附近,环流形势逐渐稳定,南方地区降水有所减弱;（2）影响贵州地区水汽输送的水汽通道主要为为孟加拉湾、南海和西北太平洋,尤其是从孟加拉湾经中南半岛进入的西南风水汽输送和南半球经南海的越赤道气流;（3）低频强降水年频次多年与拉尼娜事件从准备到爆发再衰弱的不同位相期相对应,低频强降水年频次少年与厄尔尼诺事件从准备到爆发再衰弱的不同位相期相对应

Characteristics of main meteorological factors affecting low-frequency heavy precipitation in Guizhou

Based on the low-frequency precipitation in Guizhou and the water vapor transport path in East Asia, this paper also compares and analyzes the water vapor difference and the precursory SST difference between low-frequency precipitation over many years and young years. The main conclusions are as follows :(1) The circulation pattern of "two trough and one ridge" began to form in the mid-latitude region of Eurasia in July; The circulation situation of "two trough and one ridge" was stable in August and September. The western ridge point of the subtropical high is located near 120oE, the circulation situation is gradually stable, and the precipitation in the southern region is weakened. (2) The main water vapor transport channels in Guizhou are the Bay of Bengal, the South China Sea and the Northwest Pacific Ocean, especially the water vapor transport from the Bay of Bengal through the Indo-China Peninsula and the trans-equatorial air flow from the Southern Hemisphere over the South China Sea. (3) low frequency annual precipitation frequency in the sea surface temperature (SST) over many years of the evolution of the tropical eastern Pacific anomaly largely reflects a la Nina event from the different phase of outbreak and weak period, low precipitation years frequency of juvenile sea surface temperature (SST) over the tropical eastern Pacific anomaly largely reflects the evolution of an el nino event from the different phase of outbreak and weak