摘要
应用湿位涡理论 ,对 1 998年 6月滇中地区罕见的 6场暴雨过程进行了诊断分析。结果表明 :θe 面陡立且南侧暖湿气流活跃 ,易导致湿斜压涡度发展 ,形成θe 陡峭密集区 ,密集区内暴雨容易发生 ;湿空气对流活动层仅能达到 50 0hPa至 60 0hPa之间 ,若对流层低层MPV1 <0 ,同时MPV2 >0 ,易产生暴雨。
By using the concept of moist potential vorticity, the characteristics of moist potential vorticity are analyzed in the process of the six heavy rain days over the middle Yunnan in June 1998. The results show that the very stiff moist isentropes and strong warm and moist air located its south can lead to the development of moist slantwise vorticity and the heavy rain occurred. The top of moist convection air can only attain between 600 hPa and 500 hPa levels. When MPV 1<0 and MPV 2>0, sudden heavy rain will probably happen.
出处
《高原气象》
CSCD
北大核心
2000年第2期253-259,共7页
Plateau Meteorology
关键词
湿位涡
倾斜涡度发展
暴雨
诊断分析
Moist potential vorticity Slantwise vorticity development Heavy rain
