热带大气能量频散波射线的低频动力学特征

THE LOW FREQUENCY DYNAMICS ON THE WAVE RAY PROPAGATION OF TROPICAL ATMOSPHERE ENERGY DISPERSION

首先在非零频波条件下采用有、无辐散两类数学模型 ,讨论热带大气低频波传播动力特征 ,研究结果表明 ,非零频的波频率参数是热带大气低频振荡源能量频散波路径及其波振幅的关键影响因子 ,且热带地区低频振荡的经向传播与其伴随着的强对流云团有显著相关 ,并与热带低纬 β因子等相关。文中还进一步揭示了低纬大气低频振荡经向传播伴随的积云对流现象及向高中纬传播机理 ,描述了 WKB近似方法数学模型及其波射线方程解模态对大气低频动力特性及其水汽分布垂直结构、不稳定层结等因子的响应特征。

In the presence of non zero freqnency wave (NFW),two kinds of mathemaical models witrh or witrout divergence are investigated ahiut the dynamics of low frequency propagation of tropical atmosphere in tre study .The results suggest that the frequency parameter of NFW is a key factor ,which dominates the wave train qath of energy disqersion as well as the amplitude variation ,and that the meridionalpropagation of low frequency oscillation(LFO )in tropics has the significant correlatiln with the strong convetive cloud cluster accompanied anf ,to a certain eztent ,with β effect in the lower latitudes .The conclusion presdnted here confirms further the phenomena and mechanisms about the metidional migration of armospheric LFO imn lower latitudes and the accompanying cumulus convection.The mathematical mode of wave ray epuation responding to the atmospheric LFO dynamic characteristics.The vertical structure lf water vapor and umstable stratification etc.are also shown in the paper,