Open AccessA study of trends and periodicities in the seasonal and annual rainfall of India
Author(s) -
Balaji Parthasarathy,
ON Dhar
Publication year - 1976
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v27i1.2382
Subject(s) - climatology , monsoon , trend analysis , standard deviation , environmental science , seasonality , annual cycle , statistical analysis , geography , statistics , mathematics , geology
The seasonal and annual rainfall of India for each year of the 60-year period from 1901 to 15 to1960 have been studied by subjecting them to the latest statistical techniques. This analysis has brought out that the mean annual rainfall is of the order of l19cm with a standard deviation of 9.5cm. Fisher's statistics have shown that the frequency distribution of time series of seasonal and annual rainfall are normal. Significant increase of 5 percent in 30years' mean is observed in the southwest monsoon and the annual rainfall but the increase of 6 per cent in the post monsoon rainfall is not statistically significant. Power spectrum analysis has revealed the presence of 2.3 to 2.5 years' cycle and a weak cycle of about 10.15 years.