EVOLUTIONAL FEATURES OF INTERANNUAL LOW-FREQUENCY OSCILLATIONS AND THEIR RELATION TO THE OCCURRENCE OF EL NINO

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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 the elements of sea surface temperature (SST),zonal wind at sea level (U),sea level pressure (SLP) and total cloud 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 using the methods of extended EOF (EEOF) and lag comelation analysis with the oscillational components of SST in the equator of eastern Pacific as the reference element.In our paper,the relationship between oscillation components and occumence of El Nino is also investigated.
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