低纬大气Kelvin波和Rossby波的非线性相互作用  

Nonlinear Interaction between Atmospheric Kelvin and Rossby Waves in Low Latitudes

作　　者：吴建云[1] 周伟灿[1] 沈新勇[1] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室,江苏南京210044

出　　处：《南京气象学院学报》2008年第5期662-670,共9页Journal of Nanjing Institute of Meteorology

基　　金：江苏省气象灾害重点实验室资助项目(KLME060206)

摘　　要：利用多重尺度摄动法,对低纬大气Kelvin波和Rossby波的波包演变进行了分析,得到两波的非线性相互作用方程为耦合的非线性复系数Landau方程组。数值计算表明两波相遇将使波振幅变化,波宽变窄;两波非线性相互作用可能是低纬强烈天气突然爆发的原因之一。The nonlinear Kelvin and Rossby waves of atmosphere in low latitudes are studied. Using the Wentzel-Kramers-Brillouin（WKB） method, it is found that the interaction between two wave packets is governed by the coupled nonlinear Landau equations with complex coefficients. Numerical calculations show that the wave amplitudes change and the wave widths become narrow after the collision of two solitary waves. The results indicate that the nonlinear interaction between Kelvin and Rossby waves may be one of causes, which inspire the severe convective weather in low latitudes.

关 键 词：KELVIN波 ROSSBY波 耦合非线性Landau方程组 包络孤立波解 

分 类 号：P732.6[天文地球—海洋科学]