Long Periods Variance Of South China Sea's Sea Surface Temperature And Its Coupling Relation With El Nino

In these several decades, most oceangrapher and climatologist pay more and more attention to global variance of the ocean and atmosphere. Scientists found that once it occur El Nino 3-7 years a time, it means that the sea surface temperature(for short SST) of the earth' s equator East Pacific Ocean South American seacoast area will be higher than normal years. And it will cause lots of the area' s fish to be dead, great range reduction of fish captures, and global abnormal climate. The abnormal SST of equator East Pacific Ocean seacoast area become an important symbol of El Nino. Now scientists regard the area' s extent of normal SST as a guideline of the intensity of El Nino.South China Sea is connected with torrid zone West Pacific Ocean. Whether its SST is same to the change cycle of El Nino? And what does it relate to the equator East Pacific Ocean seacoast area' s SST? That is this paper' s mostly content.The research of this problem will discover the relation of the long cycle change of South China Sea' s SST with El Nino' s change. And it is great meaning to research and forecast for the influence of El Nino to South China Sea.Spectrum analytical method mainly seek disperse power spectrum or relation power spectrum to get the rule of climate elements' change. One dimension power spectrum analytical method can preferably discover the rule of the change of variational factor. Two dimension power spectrum(cross spectrum) analytical method can reflects the couplingrelation within 2 variational factors. This method is usual way to research the change rules of long period, series, continuous data hydrologic weather elements. Especially it' s notable that we research the relativity of coupling relation with two climate elements. Through this Method, this paper analyzed South China Sea in Xisha ocean station(16 ° 50' N, 122° 20' E) in 1961 — 1987' s and Peru and Ecuador outside sea' s(5° S~5° N, 80° —90° W) monthly average of SST. And analyzed one and two dimension water temperature power spectrum, and counted the intensity and exponent of the SST' s abnormity. Analyzed the long periods change of South China Sea' s SST(Xisha ocean station' s data) and the coupling relation with the same period of East Pacific Ocean Peru sea area' s SST.The result indicate that the SST of these area exist a long periods change with 3. 3 years, and Peru and Ecuador outside sea' s will be ahead of 5 months than that of South China Sea. The change is inphase. In 1960~ 1987, once East Pacific Ocean seacoast occur positive and reverse El Nino phenomena, South China Sea will occur a quite intensive worm and cold event.