正压大气中的代数Rossby孤立波

本文研究了基本气流具有线性弱切变的非线性Rossby波,得到了一个非线性发展方程为Kubota方程,在一定的条件下,可变为Benjamin-Ono方程,并指出当代数Rossby孤立波的振幅越大时,代数Rossby孤立波的传播速度越小,基流切变越强,代数Rossby孤立波越慢,同时我们还指出在代数Rossby孤立波的振幅满足一定的条件下,代数Rossby孤立波才随纬度的增高(β减小)而减慢。并且代数Rossby孤立波的结构与大气中的偶极子阻塞是一致的。

ALGEBRAIC SOLITARY ROSSBY WAVE IN THE ATMOSPHERE

In this paper, nonlinear Rossby waves for the linear weak shear basic flow are investigated to obtain nonlinear Kubota equation, under certain condition, the Kubota equation reduces to Benjamin-Ono equation. Furthermore, author finds that 1)the larger the amplitude of algebraic solitary Rossby wave and the shear of basic flow, the smaller the propagation speed of algebraic solitary Rossby wave, 2) when the amplitude of algebraic solitary Rossby wave satisfies a certain condition, the phase speed of algebraic solitary Rossby wave decreases with increasing of latitude, and 3) the horizontal structure of algebraic solitary Rossby wave is consistent with dipole blocking in the atmosphere.