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《Chinese Journal of Atmospheric Sciences》 1984-04
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THE NONLINEAR INTERACTION BETWEEN DIFFERENT WAVE COMPONENTS AND THE PROCESS OF INDEX CYCLE OF GENERAL CIRCULATION

Xu Youfeng(Institute of Atmospheric Physics, Academia Sinica)  
By using a two-level quasi-geostrophic truncated spectral model, and taking the nonlinear interaction between different wave components (basic current, ultra-long waves and long waves) into consideration, the index cycle of circulation is investigated. The calculated results show that the circulation index has a quasi-periodic vacillation with period of 8 to 16 days, which can be created by the nonlinear interaction, and that the nonlinear interaction between different wave components can cause the tilted-trough vacillation, amplitude vacillation of wave pattern and the quasiperiodic change of wa-venumber of flow pattern.
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