On the interaction of tropical cyclones with each other and with different atmospheric structures

Abstract

The paper deals with the investigation of the interaction of tropical cyclones (TC) of the Atlantic and Pacific oceans with each other and with the polar front on the basis of computations using the mesoscale numerical ETA-model. The process of the interaction is demonstrated of TC Man-yi with the polar front accompanied by the distortion of vorticity circle and its consolidation with the vorticity zone of the polar front as well as by the formation of a convective “tail” interacting with the frontal zone. It is shown how one can define the beginning of this interaction, the moment of the potential trajectory turn, and the interaction process between a pair of tropical cyclones using the sea level pressure and vorticity fields. The transformation of the kinetic energy field at the isobaric surface of 850 hPa can serve as an indicator of the energy transfer between the cyclones. The influence of islands on the hurricane Gustav resulting in certain changes in the structure of vorticity, wind speed and kinetic energy fields is considered.