The Asymmetry and Movement of Tropical Cyclones: A Numerical Simulation

[摘要] The relationship between the asymmetry and movement of storms is investigated using the numerical simulation of a model cyclone. Subtracting the symmetric vortex from the total flow yields the asymmetric wind. In the asymmetric wind field in the lower converging layer, there are two eddies. Looking downwind of the mean wind, the cyclonic eddy is found on the left and anticyclonic eddy on the right.The inner areal mean wind averaged within a 1.8° latitude radius in the lower convergint layer is directed to the left, while the outer areal mean wind averaged over the band from 1.8° to 9.5° latitude radii is directed to the right of the direction of movement during the developing period. Both of these mean winds during the decaying period are nearly in line with the direction of movement of the vortex.

[学科分类] 大气科学