The analysis of 19 years data of geopotential height anomolies reveals that there exist well defined teleconnectivity patterns for the tropical region just like the various seesaw or standing oscillation patterns of the northern hemisphere. This study suggests that the orientation and the connectivity in the tropics changes for winter and summer monsoon seasons. For example, the south Asian region shows strong teleconnection with Africa during summer monsoon; and for winter the connection of south Asia is found to be with the south west coast of south America. First two empirical orthogonal functions (EOFs) explain about 30% of the observed variabilities. Various experiments done by averaging over time scales for different decades has shown that the statistics is capable of detecting the planetary waves of different time scales.
In order to check the statistical stability of the results, the entire data from 1980 to 1998 was broken in to two sets for the period (a) 1980 to 1989 and (b) 1990 to 1998. The teleconnectivity map and one point correlation map was constructed for these two periods. The results show that the teleconnectivity pattern are similar to the those seen in the data for the entire 19 year period. Thus we believe our results are statistically significant and are reproducible.
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