Behera and Yamagata (2001) studied the influence of the Indian Ocean Dipole (IOD) on the interannual atmospheric pressure variability of the Indo-Pacific sector. They found from the Statistical correlation analysis between the IOD index and the global sea level pressure anomalies that loadings of opposite polarity are distributed between the western and the eastern parts of the Indian Ocean. The area of positive correlation in the eastern part even extends to the Australian region and the IOD index has a peak correlation of about 0.4 with the Darwin pressure index that is the western pole of the Southern Oscillation. This relation has undergone decadal changes; significant reduction in the correlation is found during the period from 1977 to 87 due to the decrease in the IOD occurrence. It is noted, however, that the IOD index has almost no correlation with the sea level pressure anomaly of the eastern Pacific.
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Reference: Behera S.K. And T.Yamagata. Impact of the Indian Ocean Dipole on the southern oscillation. 2001, Manuscript submitted to J.Climate. (html, pdf)