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Analyses of the basic features of the South China Sea's interannual low frequency SST oscillations, by using the 1958-1987 COADS data set, empirical orthogonal function, spectrum, digital filter, show that: 1) There are SST low frequency oscillations of 20 -- 40 months, the most remarkable being the quasi-biennial oscillations, then those with the 3 -- 4 year period. 2) There oscillations generate...