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The regularity of the change of the unstable oscillation wave form and the structure of the power spectrum were analysed.
计算并绘出了非稳区域边界，分析了非稳振荡波形变化规律及其模结构。
The following conclusions are obtained: 1. the density wave in an unstable area develops a finite continuous oscillation.
得到如下一些重要结论：1。不稳定区域密度波振荡为有限的持续振荡。
Results show that the quasi biennial (QB) oscillation is the most unstable mode of the linear coupled air sea system and only the QB mode displays ENSO-like horizontal structure.
结果表明：准两年振荡是线性海气耦合系统中的最不稳定模态，且只有该模态类似于ENSO水平结构。
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