Abstract
In the present paper, coherence studies have been made of two pairs of variables with four different season's series: (a) the unfiltered and filtered Indian temperature anomaly (ITA) and Indian monsoon rainfall series; and (b) the unfiltered and filtered northern hemispheric temperature anomaly (NHTA) and Indian monsoon rainfall series. The significant coherences exist with ITA at confidence levels varying from 95 to 99 percent at cycles of 4.8, 3.0 and 2.4 years in winter, 4.8 and 2.7 years in spring, 6 and 3.4 years in summer and 4 and 2.4 years in the autumn season. Likewise, the coherences with NHTA series at 95 to 99 percent level have been perceived, one at the relatively high frequency of 2 to 2.7 years and the second at the relatively lower frequency of 3 to 8 years during the four seasons. The presence of the above cycles suggests the possible role ofQBO andENSO phenomena.
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