Recent research from IIT Delhi points finger at human activity for India's erratic weather,especially extreme rainfall and flooding. Study in Environmental Research Letters analyzed rainfall data from 1905 to 2014,giving key insights into climate change's impact on India.
Using a method called fingerprinting,researchers aimed to separate natural weather shifts from human-driven ones . By comparing observations with computer models,they isolated greenhouse gas effects from natural phenomena like El Niño. This showed a clash in India's atmosphere: warming greenhouse gases versus aerosols. Aerosols,from vehicles and industry,can temporarily suppress rainfall .
T.S . Chaithra,PhD student at IIT Delhi and lead author,noted that extreme rainfall patterns are changing. “In West Central India,we find both observed increases in extreme precipitation indices and evidence that greenhouse gas forcing is a dominant driver of this intensification,” Chaithra said. The study warns: as air quality improves and aerosols decrease,the cooling they provide fades, possibly unleashing extreme rainfall.
While scientists and policymakers in India tackle air pollution,this study suggests cleaner air has side effects . As aerosols drop,full impact of greenhouse gas warming could emerge,boosting extreme weather that aerosols now moderate .
Despite alarming findings,Chaithra advised caution in discarding historical rainfall data for urban planning. She stressed its importance for understanding local patterns and vulnerabilities. But warned that relying solely on past data might mislead future risk assessments. “More broadly,historical rainfall statistics alone may not provide a reliable guide to future risk in warming climate,particularly in regions where extreme rainfall is already showing a clear upward trend,” she noted.
The study pushes urgency for urban planners,policymakers to rethink climate adaptation strategies. As India grapples with climate change and urbanization,grasping evolving rainfall patterns will be key to lessening future extreme weather impacts…
