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A simplified data set with 8°×8° grid system in a region of 32°S--32°N from 1951 to 1979 for theelements of sea surface temperature (SST), zonal wind at sea level (U), sea level pressure (SLP) and totalcloud amount (CA) is made from the COADS. The oscillation components with periods of 2 years (QBO),3.5 years (SO) and 5.5 years (FYO) in interannual low-frequency oscillations have been studied by usingthe methods of extended EOF (EEOF) and lag correlation analysis with the oscillational components of SSTin the equator of eastern Pacific as the reference element. In our paper, the relationship between oscilla-tion components and occurrence of El Nino is also investigated.
A simplified data set with 8 ° × 8 ° grid system in a region of 32 ° S - 32 ° N from 1951 to 1979 for the elements of sea surface temperature (SST), zonal wind at sea level (U), sea level pressure The oscillation components with periods of 2 years (QBO), 3.5 years (SO) and 5.5 years (FYO) in interannual low-frequency oscillations have been studied by using these methods of extended EOF (EEOF) and lag correlation analysis with the oscillational components of SSTin the equator of eastern Pacific as the reference element. In our paper, the relationship between oscillating components and occurrence of El Nino is also investigated.