The Spatial Patterns and Teleconnection Analysis of Low Frequency Oscillation over West Pacific and Indian Ocean in Low-latitude form 1980 to1983

Using the filtered OLR data from 1980 to 1983, the features of low frequency oscillation over the West Pacific and the Indian Ocean in lower latitude are studied by means of the EOF method. The results show that there exist great differences to the intensities, spatial patterns and the variations of time coefficient of low frequency oscillation in these regions between normal years (1980~1981) and abnormal years (1982~1983). Furthermore, it is found that there exist three species of low frequency teleconnections for normal years, i.e. the equatorial West Pacific, the northern tropical West Pacific and the equatorial Indian Ocean patterns, while there only exist two species of those for abnormal years, i. e. the equatorial West Pacific and the southern tropical West Pacific patterns. Because of the influences of E1 Nino, there exist great variations both for the locations and intensities of low frequency oscillation centers of west-east bipolar circulation pattern.