The second-order shear of the basic flow represents an instable factor for the symmetric disturbance, and drives the unstable mesoscale disturbance to travel in the meridional direction;
基流二次切变对于中尺度对称扰动来说是一个不稳定因子，并且驱动不稳定的中尺度对称扰动在南北方向传播；
This paper discusses the stability of internal inertial gravity wave in the heterogeneous stratified atmosphere when basic flow appears to be weak vertical shear by the WKB method.
本文应用WKB方法研究了在弱非均匀层结大气中，当基本气流具有弱垂直切变时，重力惯性内波的稳定性问题。
When the motion of the basic state is the shear flow (or the differential rotation), this property means that the unstable waves would evolve automatically into the quasi-stationary stage.
当基态运动为剪切流(或较差旋转)时，这一性质将使不稳定波自动演化到准稳阶段。
The results show that, when the wind shear of basic flow is not zero, there exists continuous spectrum of gravitational inertial wave and vortex wave.
结果发现：当基流存在切变时，无论是重力惯性波还是涡旋波都存在连续谱。
The results show that, when the wind shear of basic flow is not zero, there exists continuous spectrum of gravitational inertial wave and vortex wave.
结果发现：当基流存在切变时，无论是重力惯性波还是涡旋波都存在连续谱。
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