斜压基流中的非线性中尺度重力惯性波

THE NONLINEAR MESO-SCALEINERTIAL-GRAVITATIONALWAVE IN BAROCLINICBASIC FLOW

本文使用行波法分析求解y-z平面上的二维流体非线性动力学方程组,在斜压基流的背景场下讨论了CISK加热影响下的粘性非线性椭园弦波以及重力惯性孤立波的特征。一般情况下,中高纬度地区层结较稳定在呈气旋性切变的强斜压性基流背景场之中,CISK加热系数ηb较小而ηd较大影响下的重力惯性孤立波表现为陡而范围小的特征。也就是说,在较小的中尺度范围内,集中产生较为强烈的灾害性天气。

The present paper have solved the nonlinear two-dimensional fluid-dynamics equations on a y-z plane by using travelling-wave method and analyzed the characteristics of nonlinear viscous elliptic cosine wave and inertial-gravitational wave with CISK heating process in a baroclinic basic flow. In general,the inertial-gravitational solitary wave appears to be abrupt, i. e. , bigger in its amplitude intensity but smaller in its horizontal width, influenced by the smaller CISK heating coefficient ηb and the bigger ηd in stabler stratification, strong baroclinic cyclonic basic flow in the zone of midhigher latitude. In other words,this kind of solitary wave can produce some disastrous weathers in meso-β scale range.