摘要
本文采用位涡反演方法，对一次西太平洋地区爆发性气旋的生成机制进行了诊断分析。结果表明：高层位涡扰动（即高空槽脊系统）所诱生的低层扰动风场特征为一支位于高空槽前下方的偏南气流，这支偏南气流是促使低层锋区扰动发展的主要动力因子；而低层位涡扰动（即低层锋区扰动）所诱生的低层扰动位势场和扰动风场是低层降压和气旋性环流生成的主要原因。
A diagnostic study of the explosive Cyclone is conducted by using the PV invertibility approach. The result shows that the characteristics of low level perturbation windfield induced by the upper PV perturbation,i. e., upper trough and ridge system,is a southerly flow located beneath the eastern flank of the mobile upper trough, which is the main dynamic factor driving the development of low level frontal perturbation. The fall of pressureand the strengthening of cyclonic circulation in low level are determined by the perturbationgeopotential and perturbation wind fields associated with low level PV perturbation,i. e,lowlevel frontal perturbation.
出处
《气象科学》
CSCD
北大核心
1998年第2期121-127,共7页
Journal of the Meteorological Sciences
关键词
气旋
生成机制
位涡反演
诊断分析
Cyclogenesis mechanism
PV invertibility
diagnostic analysis
