Dynamic characteristics of typhoo n vortex spiral wave and its translation: a diagnostic analyses
台风涡旋螺旋波及其波列传播动力学特征：诊断分析

By using the power spectrum analysis and the T BB time serial data, the wave train characteristics of typhoon spiral band are analyzed in a relative coordinate centered on the typhoon center for three typhoons as the targets of case study. The results show that the correlation coefficient field between the T BB on and around the eye presents remarkable wave characteristics of spiral band. There exists a distinct characteristic of sub synoptic scale and meso scale wave in typhoon spiral band with above 6h and about 24h time scale, and their phase speeds are similar to those of inner gravity wave and vortex Rossby wave. The high and low level streams of the spiral bands have close relation with the sustaining and developing of typhoon. In addition, the deviation distribution of the disturbed T BB is similar to the vortex Rossby wave train, and the structure model of the typhoon vortex spiral wave is put forward.