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Interannual and long-term variability of the summer monsoon and its possible link with northern hemispheric surface air temperature

Verma, RK and Subramaniam, K and Dugam, SS (1985) Interannual and long-term variability of the summer monsoon and its possible link with northern hemispheric surface air temperature. Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 94 (3). pp. 187-198.

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Abstract

Some statistical properties of the summer monsoon seasonal rainfall for India during the last 100 years (1881-1980) are presented. The most recent decade of 1971-1980 shows the lowest value of standard-decadal average monsoon rainfall (86.40 cm) and is also characterised by the second highest value of coefficient of variation in monsoon rainfall (12.4 ). The combined last two standard-decadal period of 1961-1980 was the period of the largest coefficient of variation and the lowest average monsoon rainfall for India. The possible influence of global climatic variability on the performance of the monsoon is also examined. Analyses of correlation coefficient show that a statistically significant positive relationship with a time-lag of about six months exists between monsoon rainfall and northern hemispheric surface air temperature. A cooler northern hemisphere during January/February leads to a poor monsoon. All the major drought years during the last 3 decades had much cooler January/February periods over the northern hemisphere-1972 having the coldest January/February with a temperature departure of -0.94°C and the most disastrous monsoon failure.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian academy of Science
Uncontrolled Keywords: drought years; India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 22 Apr 2015 11:06
Last Modified: 22 Apr 2015 11:06
URI: http://moeseprints.incois.gov.in/id/eprint/1244

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