Except for the intraseasonal oscillations(81d and 101d),the chlorophyll concentration has also apparent interannual oscillation signal(3 a) which correlates significantly with the ENSO index(-0.28).

• 进一步的分析表明；台湾海峡区域平均的叶绿素含量不仅具有周期约81 d和101 d的季节内振荡信号；还具有与ENSO指数呈显著负相关(-0.；28)的周期约3 a的年际振荡信号