Extended Abstract (136K)10D.4
The Dynamic Characteristics of Typhoon Vortex Spiral Wave and its Transportation: Diagnostic Analyses
Xiangde Xu, Chinese Academy of Meteorological Sciences, Beijing, P. R. China, China; and S. Zhang, L. Chen, and F. Wei
By using the power-spectrum analysis and the TBB time-serial data, the wave-train characteristics of typhoon spiral band are analyzed in a relative coordinate centered on the typhoon center, with 3 typhoons as the targets of case study. The results show that the correlation coefficient field between the TBB on the eye and around it 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 the periods of 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. Besides, the deviation distribution of the disturbed TBB is similar to the vortex Rossby-wave train, and the structure model of typhoon vortex spiral wave is put forward.
Session 10D, tropical cyclone observations and structure V
Wednesday, 5 May 2004, 10:15 AM-11:45 AM, Napoleon III Room
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