Low frequency oscillations in summer monsoon rainfall over India
The paper deals with spatial and temporal variations of different frequency modes of the southwest monsoon rainfall over India. Daily normal rainfall data (1901-1970) and that of the individual years for the period 1978-1983 for 220 well distributed stations throughout the country are subjected to harmonic analysis to investigate the contributions of different frequency modes.
The results reveal the presence of 30-60 day periodicities as a predominant mode over central Peninsula in the long term normal as well as individual years. The variance explained by the 10.20 days oscillations exceed that of 30-60 days over central India during the good monsoon years.
In good monsoon years the fundamental mode is predominant north of about 25° N while during the bad monsoon years it extends to more southern latitudes.
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