北方气旋和南方气旋发展的反演对比分析

Contrast Analysis of Inversion of the Development of Northern and Southern Cyclone

通过 Davis扰动位涡反演方法 ,对北方和南方气旋分别进行反演诊断和对比分析 ,结果表明 :北方气旋的发展具有显著的中纬度斜压扰动发展特征。低层锋区扰动强迫是中低层气旋发展的最主要因子 ,低层位涡扰动反演所得的负位势扰动大值中心位于气旋的前方 ,有导前现象 ,为气旋继续东移、发展提供一个铺垫 ;高层系统起着间接强迫作用 ,高层槽脊系统的发展和低层锋区的相互作用所导致的斜压扰动成为气旋发展的重要机制。南方气旋发展的主要因子为中层槽脊系统及凝结潜热加热 ;

Davis’s disturbance potential vorticity inversion method is used to diagnose the northern and southern cyclones, and the contrast analysis is conducted. The results show that the development of northern cyclone has the characteristics of remarkable middle latitude baroclinicity disturbance development. The force of low level frontal zone disturbance is a major factor of the development of middle and low level cyclone. The large center of negative geopotential perturbation inversed by low level disturbance potential vorticity is located in the front of cyclone providing a favourable condition for the eastward moving and development of cyclone. The high level system plays a role of indirect force action. The interaction of the development of high level trough and ridge and low level frontal zone becomes an important mechanism of the developing of cyclone. The main factor of southern cyclone is latent heat release and middle level trough and ridge systems. The frontal zone baroclinicity force performs a certain function only at low level.