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SADHUKHAN, I.; LOHAR, D.  and  PAL, D. K.. Studies on recent changes in premonsoon season climatic variables over Gangetic west Bengal and its surroundings, India. Atmósfera [online]. 2000, vol.13, n.4, pp.261-270. ISSN 0187-6236.

A comparative study has been made in order to address some scientific issues like changes in precipitation and temperature patterns for the premonsoon season during the period 1973-92 over Gangetic West Bengal and its neighbourhood, a region in the eastern part of India. Though premonsoon precipitation contributes only about 12% of the annual rainfall, it is the maximum amount outside the monsoon season. It also occurs after a wide gap of eight months. While constructing the data series, a particular area has been identified where maximum reduction in precipitation occurs in the recent period 1983-92. Statistical analyses with the data series reveal that decrease in precipitation and increase in mean temperature in the month of March are statistically significant. April and May follow the same trend though they are not statistically significant. Integrated Differences Curve shows invariably a reverse associateship between the mean temperature and precipitation.

Keywords : Gangetic West Bengal; premonsoon; thunderstorms.

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