Coupling effect diagnoses of quasi-stationary mesoscale vortex in Guangxi rainstorm process of China
The mesoscale weather system which affected the Guangxi flash-flood-producing rainstorm of China in June 2008 is a quasi-stationary mesoscale vortex.Its genesis and development is closely related to the coupling effects of weather systems in different scales and different latitudes.On the one hand,the coupling of synoptic scale high- and low-level jets provides the environmental conditions for development of vortices and vertical circulations in the mesoscale vortex; On the other hand,the coupling of waves in mid-latitude westerlies and perturbations in low-latitude warm-moist flow under the influence of complex terrain makes the mesoscale vortex circulations strengthened.With the piecewise potential vorticity (PV) inversion method,PV anomalies in different regions are analyzed; also the vortex-vortex interactions and vortex-background flow interactions are diagnosed.Thus,the reasons why the mesoscale is quasi-stationary at first,while developing and deepening later are indicated.Under the condition of coupling effects,the vertical motions accompanied with the mesoscale vortex can be diagnosed with the PV-ω inversion system based on the analysis of quasi-balanced flow.
Mesoscale vortex Coupling Vortex-vortex interactions Vortex-background flow interactions Quasi-balanced flow
葛晶晶 陆汉城 钟玮
南京军区气象水文中心 解放军理工大学气象学院
国内会议
沈阳
英文
1-23
2012-09-01（万方平台首次上网日期，不代表论文的发表时间）