大气环流的不连续振荡和指数循环

本文利用两层斜压准地转模式,在低谱简化下,得到一个热力强迫波,瞬变波与纬向气流相互作用的非线性方程组。在近共振和弱斜压不稳定的假定下,利用多尺度方法和不连续振动分析方法,详细讨论了相空间中解的性质。初步讨论了大气环流非均匀指数循环的物理机制。

DISCONTINUOUS OSCILLATION IN THE ATMOSPHERIC CIRCULATION AND INDEX CYCLE

Using a low order, two-layer baroclinic quasi-geostrophic model, a nonlinear system including the interaction between a thermal forced wave, a transient wave and zonal flow is studied. Under the conditions of near-resonance and weak baroclinic instability, the features of solution in the phase space are discussed with the analytical method of multiple scale and discontinuous oscillation. The results show that the dynamic coupling between the forces wave and transient wave is responsible for the physical mechanism of the nonuniform index cycle of the atmospheric circulation.