阻高建立和副高北跳的非线性机理研究

We established a thermal forcing and friction dissipating nonlinear baroclinic atmosphere dynamical system in which ultra-long wave and long wave interact on zonal flow are considered..The synthesis analysis method among phase trajectory, phase variable time curve, stream function and Poincaré are adopted. It is researched to the system states and flow patterns evolvement on zonal well-proportioned and heterogeneous thermal forcing and the effect of friction dissipation. Truncate spectral step’ influence for system is also studied. We discussed the mechanism of blocking high pressure establishing the mountain’s effect on the blocking high pressure on the Northern Hemisphere winter, and subtropical high’s jumping northward and extending westward.The results show that there is no substantiality effect but increasing more complexity for.atmosphere system when considering long wave, and the shift of thermal force make system states and flow patterns change greatly. The establishing of Ural blocking high pressure has close.relations with oscillating wave of the system and Rossby wave of mix module. The develop of weather wave is of advantage to arose oscillation, but altitude of the mountains can change.oscillation of blocking high pressure and the state phase. The phenomenon of subtropical high jumping northward and extending westward can take place on a certain condition.

针对冬季阻高建立与夏季副高北跳这两个环流突变问题，采用非线性动力学的理论和方法，将特定的大气环流方程组转化为阶数很高的非线性谱模式。然后研究该模式中波与基流的相互作用；分析大尺度地形与非绝热加热强迫下的环流突变；探讨阻高建立及副高北跳与系统内部物理过程和外部影响因子的关系，深入认识突变机理，寻找物理判据。