The Effect Of Tangential Wind Profile On Track And Intensity

Recently, the factors of inner dynamics have been paid more attention in studying typhoon's track and intensity. Among them, the reaction between typhoon circulation and adjacent mesoscale vortex is more and more noticed. The relation of the structure of circular basic flow of typhoon and the reaction is short of study in existent work. The paper collected three types of the structure of circular basic flow of typhoon, namely three types of tangential wind profile. Through performing six experiments by means of a beta-plane quasi-geostrophic model and a high resolution f-plane quasi-geostrophic model, the effect of initial tangential wind profile on typhoon's track and intensity is examined. The result shows that the profile which has a narrow region of peak value of tangential wind and a shorter radius of maximum wind, corresponds with the leaning northwest track and the maintenance or enhancement of intensity; The profile which has a wide region of peak value of tangential wind and a longer radius of maximum wind, corresponds with the northern-turn track and the attenuation of intensity. So tangential wind profile is an important factor that impacts on typhoon's track and intensity.