摘要:利用ECMWF资料诊断分析了位涡倾向方程中的水平平流项和非绝热加热项分别在Muifa台风两次路径转折中的作用。结果表明：第一次路径转折过程中，非绝热加热项的量级比水平平流项小一个量级，水平平流项所表征的外部大尺度环流因素是第一次路径转折的主要原因；第二次路径转向过程由水平平流项和非绝热加热项共同控制，其中水平平流项控制台风的移向，非绝热加热项表征的内部非对称结构对台风转向有抑制作用。
关键词:位涡倾向/
水平平流项/
非绝热加热项/
非对称结构
Abstract:Horizontal advection and diabatic heating terms in the potential vorticity tendency equation are used to diagnose the twice track changes of typhoon Muifa based on ECMWF data. The results show that horizontal advection is about one order of magnitude larger than diabatic heating; large-scale steering flows represented by horizontal advection mainly contributed to the first track change; horizontal advection and diabatic heating both contributed to the second track change, while horizontal advection controlled the direction and diabatic heating restrained its track recurvature.
Key words:Potential vorticity tendency/
Horizontal advection/
Diabatic heating/
Asymmetric structure
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