Analysing rainfall and temperature data of 50 years, researchers from Indian Institute of Science (IISc) have found that the frequency of heatwaves accompanied by drought has increased not only in magnitude but in area too over the past three decades particularly in Gujarat and Central India.
While heatwaves (or, a prolonged period when temperatures approach record extremes) and droughts are destructive even when occurring in separate events, their concurrence is far more serious.
“A single extreme event may not be critical, but two extremes occurring at once is much more significant in the distress it causes,” said Pradeep Mujumdar, Professor at the Department of Civil Engineering, IISc who along with his doctoral student Shailza Sharma published the study in the journal Scientific Reports an online open access journal from Nature on November 14
Heating up fast -Researchers calculated the Heatwave Magnitude Index daily (HWMId) which combines duration and magnitude of heatwaves and the Standardized Precipitation Index (SPI), which defines meteorological drought from 1951 to 1981.
Using that as the base, they compared it with the HWMId and SPI between 1981 and 2010.
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