Deforestation reduces summer rainfall in Ganga Basin, north-east

Using satellite data and regional climate models, IIT Bombay researchers have found that deforestation (converting woody savanna to crop land) in north-east India and north-central India has led to a 100-200 mm reduction in summer monsoon rainfall in these two regions. The land use information is based on satellite data for two time periods — 1980-1990 and 2000-2010. The results were published on August 24 in the journal Scientific Reports.

During the initial phase of a monsoon, oceanic sources play a major role in bringing rain and charging the soil with moisture. But at the end of the monsoon period, evotranspiration from vegetation contributes to rainfall. Evotranspiration is a local moisture source for rainfall. Recycled precipitation contributes to 20-25 per cent of the total monsoon rainfall during the end of the monsoon and is very prominent in the Ganga Basin and north-east India. “Because of deforestation, there is 1-2 mm reduction per day in rainfall during the end of the monsoon in the Ganga Basin and north-east India,” says Prof. Subimal Ghosh, the corresponding author of the paper from the Interdisciplinary Programme in Climate Studies, IIT Bombay.

Posted by on August 25, 2016. Filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0. Both comments and pings are currently closed.