DIAGNOSIS OF THE DEVELOPMENTAL MECHANISM OF AN EXTRATROPICAL TRANSITION OF TROPICAL CYCLONES USING OF POTENTIAL VORTICITY INVERSION OF FRONTOGENESIS

This paper diagnoses and analyses the developmental mechanism of a process of extratropical transition of tropical cyclones which occured on West Pacific Ocean based on potential vorticity inversion of frontogenesis diagnosis method.The study diagnoses quantitatively the action and affection of dynamic influence of westerly cold trough,middle latitude baroclinic frontal zone,cyclone cycle and inbalanced wind field during the different stages of the extratropical transition of tropical cyclones,and also discusses the interaction between them and the developmental mechanism of the extratropical transition of tropical cyclones.The results show that:there are different developmental mechanisms during each stage of the extratropical transition of tropical cyclones,and the processes are also unbalanced.