认为云在准三年周期振荡过程中起着重要作用，而在准半年周期振荡中自身反馈过程则是主要的过程。

It is found that clouds play an important role in the feedback process of quasi three-yearly oscillation, and that the self feedback process is important in the quasi half-yearly oscillation.

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结果表明，夏半年南海地区存在显著的30 ~ 60天的周期振荡。

Results reveal that there are significant low frequency oscillations with 30-60 day period over the SCS region.

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