相当正压Rossby波和斜压Rossby波相互转换的分析

利用由两层准地转模式简化的低谱模式，得知相当正压结构Ｒｒｏｓｓｂｙ波为平衡态，讨论了具有相当正压结构的Ｒｏｓｓｂｙ波存在所需条件；并以定常Ｒｏｓｓｂｙ波（相当正压结构）为基态，导出反映高低层Ｒｏｓｓｂｙ波位相变化的振荡方程，指出高低层位相差的变化与垂直切交流的扰动、平均层上流函数和热成风流函数波动部分振幅扰动（Ａ’和Ｂ’）的关系，说明相当正压结构和斜医结构的Ｒｏｓｓｂｙ波是相互转换的。

THE ANALYSIS OF TRANSITION OF THE EQUIVALENT AROTROPIC ROSSBY WAVE AND BAROCLINIC ROSSBY WAVE

Through a two-level low-order quasi-geostropic medel. it is learned that equivalent barotropic state is a equilibrium state of the model. The existing conditions of the equivalent barotropic Rossby wave is discussed and then an oscillation equation reflecting the variation of the phase difference in low and up-level with the stationary Rossby wave(equvalent barotropic structure) as basic state is derived. The results show that there is relation among the variation of phase in low and up-level, the disturbance of vertical shear flow. the disturbance of phase of the stream and that of thermal wind in middle-level.Finally,it is found that the equivalent barotropic and baroclinic Rossby waves can be transformed to each other.