Abstract
本文采用多重尺度法研究了基本气流具有弱切变的非线性正压Rossby波，得到了偶极子阻塞形成的一个理论及其影响。在f平面下求得它的波包满足非线性Schrodinger方程。指出：当Rossby波的波数满足 (k为纬向波数，m为经向波数)时，大气中周期Rossby波可以产生调制不稳定，形成包络Rossby孤立波。 In this paper, the multiple-scale method is adopted to study the basic flow which has a weak nonlinear barotropic Rossby wave, and a theory and its influence on the formation of dipole blocking are obtained. Under the f plane, its obtained wave packet satisfies the nonlinear Schrodinger equation. It pointed out: when the wave number of Rossby wave meets (k for zonal wave number, m for meridional wave number), the period Rossby wave in the atmosphere can produce modulation instability and form enveloping Rossby solitary wave.
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