摘要
应用中国气象局T213客观分析资料,对四川盆地2003年8月28日～9月1日发生区域性特大暴雨的成因进行了分析.结果表明,南支低空急流的建立为该次暴雨提供了充沛的水汽输送与水汽辐合,中低层冷平流与低空急流的风速脉动是该次暴雨过程的触发机制,西南低涡是暴雨开始后才生成的,但大气低层辐合、高层辐散产生的抽气机效应促使上升运动加强,而上升运动区与正涡度区的耦合又使西南低涡得以发展和维持,给四川盆地带来更强的降水.
Based on the T213 objective analysis data, the causes of heavy rain in Sichuan from 28 August to 1 September of 2003 have been analyzed. The results show that the building of south low-level jet provided abundant vopour transfer and convergence for the heavy rain. The cold advection in low- and-mid levels and the wind of low-level jet are and trigger mechanism of the heavy rain process. South-West (SW) vortex occurred after heavy rain. The pumping effect resulted from low-level convergence and upper-level divergence caused stronger upward current, the coupling of convergence region with positive vorticity make SW vortex to develop and maintain, leading to more rainfall in Sichuan Basin.
出处
《高原气象》
CSCD
北大核心
2004年第z1期31-36,共6页
Plateau Meteorology
基金
中国气象局成都高原气象研究所开放实验室基金
四川省气象局重大项目共同资助
关键词
冷平流
低空急流
风速脉动
西南低涡
Cold advection
Low-level jet
Wind fluctuation
South west vortex
