摘要
利用一次台风的模拟资料,对台风内部的中尺度波动进行诊断。通过分析中尺度波的结构发现,台风内的中尺度波动具有重力惯性波和涡旋Rossby波的混合特征。一方面,波动的扰动高压对应于负的涡度扰动和反气旋性环流,扰动低压对应于正的涡度扰动和气旋性环流,波动的最大振幅出现在最大风速半径附近。另一方面,波动展示了强烈的辐合辐散和非地转特性。并提出了台风多边形眼墙和中尺度波动之间的联系机制模型。
The mesoscale waves in typhoon were diagnosed by using a simulated typhoon data in this paper. Through analyzing the structure of the waves in typhoon, we found that the waves possess the mixed features of gravity inertial waves and vortex Rossby waves. On the one hand, positive geopotential height perturbation is corresponding to negative vorticity perturbation and anticyclonic circulation. At the same time, negative geopotential height perturbation is corresponding to positive vorticity perturbation and cyclonic circulation. The maximum perturbation occurs near the radius of the maximum wind in typhoon. On the other hand, the mesoscale waves possess the features of strong convergence and divergence and ageostrophic wind. Finally, the authors presented a concept model to explain the linkage mechanism between the mesoscale waves and the formation of polygonal eye wall in typhoon.
出处
《热带气象学报》
CSCD
北大核心
2007年第1期21-26,共6页
Journal of Tropical Meteorology
基金
国家自然科学基金资助项目(40575022)
国家重点基础研究项目(2004CB418301)
