Inter-annual variability of the advance of Indian summer monsoon and associated rainfall
The onset of the summer monsoon over Kerala and its subsequent advance over the whole country is a spectacular phenomenon. In this paper, the onset of southwest monsoon over Kerala and Gangetic West Bengal and its north and westwards march over the country; seasonal rainfall associated with early, normal and delayed advance and features related to rapid or slow process of advance have been studied in detail. Harmonic analysis of the area weighted monsoon rainfall over the country as a whole and areas of normal or excess and deficient rainfall for the period of 35 years have also been computed. Triennial, seven and seventeen-year cycles of the rainfall variation during the season have been observed.
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