R. Suseela Reddy Jackson State University, Jackson, Mississippi
Studies have been reported about the Indian summer monsoon rainfall variability (Mooley and Parthasarathy, 1984; Sontakke et.al., 1993; Parthasarathy et.al., 1995). Recent studies have been reported that the variability of monsoon rainfall during the northern summer is well associated with the great deserts, equatorial lower stratospheric winds (QBO) and 11-year solar cycle (Reddy and Godson,1987; Reddy and Christy, 1993). In the present study we further examine the interannual and long-term variability of monsoon rainfall using all India rainfall data during June-September, for the period 1881-1997 (Parthasarathy et.al.,1997). The study has pointed out that the large-scale floods/droughts were associated with the westerly/easterly phases of the QBO. The droughts were also associated with the ENSO events. Decade analysis revealed a long-term variatiability (~ 50 year) in all India rainfall. The study further suggested that decade during 2001-2010 might receive a good amount of rainfall.
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