涡旋Rossby波传播和台风切向风速变化的数值研究  

Numerical Study on Votex Rossby-Waves Propagation and Typhoon Tangential Velocity Changes

作　　者：余锦华[1] 

机构地区：[1]南京气象学院资源环境与城乡规划系,江苏南京210044

出　　处：《南京气象学院学报》2003年第2期172-180,共9页Journal of Nanjing Institute of Meteorology

基　　金：国家科学技术部专项项目 ( 2 0 0 1DIA 2 0 0 2 6);国家自然科学基金项目 ( 499750 13)

摘　　要：设计了一个高分辨率 f 平面准地转正压涡度方程半谱模式 ,用以研究非线性对台风切向风速变化 ,以及不同初始异常条件下台风环流内涡旋 Rossby波传播和台风切向风速变化特征。6类 (14组 )试验的数值结果表明 :非线性使台风切向风速的增强减弱 ,可能使最大风速半径收缩。初始扰动中心位置对涡旋 Rossby波传播和台风切向风速变化的影响明显。扰动中心在最大风速半径附近时 ,台风最大切向风速增强最多 ;异常中心在台风外区时 ,使最大切向风速减小。初始异常尺度 (范围 )减小对台风最大切向风速变化的影响减弱。双涡分布条件下 。A semi spectral model of a quasi geostrophic barotropic vorticity equation on a f plane with high resolution is designed in order to investigate the effects of nonlinear on typhoon tangential wind changes and the vortex Rossby wavespropagation characteristics in the circulation of typhoon and the mean flow changes under variable initial disturbances.The results show that the nonlinear weakens the acceleration of typhoon tangential velocity and probably thrinks the maximum wind radius.The location of initial disturbance center exerts a significant influences on vortex Rossby waves propagation and basic flow changes.The largest increase in the maximum azimuthal mean tangential velocity occurs when the convective patch is placed at the radius of maximum wind,in contrast the deceleration occurs when initial a symmetry in outside the region.The smaller convective patch corresponds to slight changes of maximum mean wind speed.The convective patch outside the region of typhoon circulation subtracts the influences of the convective patch at or near eyewall on typhoon maximum tangential velocity.

关 键 词：涡旋ROSSBY波 台风 切向风速 强度 物理机制 

分 类 号：P444[天文地球—大气科学及气象学] P433