New Study Says Kerala Flood Are NOT Linked With Climate Change

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The frequency and intensity of extreme weather events in India appears to be going up. But it may not be right to connect every such event with climate change, as pointed out by a new study on the recent Kerala floods.

The study, done by researchers at the Water and Climate Lab at Indian Institute of Technology Gandhinagar, is based on analysis of data relating to rainfall, temperature and extreme events in Kerala between 1951 and 2017 as well as model simulations.

During this period, Kerala saw significant decline in monsoon rainfall and increase in temperature during monsoon months. There was also a decline in occurrence of heavy rainfall over one or two days. It means Kerala witnessed drying and warming during the monsoon season since 1951.

“Since we do not find any increase in the mean or extreme monsoon season precipitation during 1951-2017, attributing 2018 flood in Kerala to climate change can be difficult. Despite the significant warming observed in the last 66 years, the mean and extreme precipitation and total runoff have not increased,” researchers, Vimal Mishra and Harsh L Shah, have observed in their study published in the Journal of Geological Society of India

Instead, the study says, the 2018 extreme precipitation and flood events might have been caused due to anomalous large-scale circulation features.

Earlier studies have shown impact of deforestation on monsoon rainfall in the Western Ghats. Changes in land use and land cover also affect hydrological conditions, which in turn, can affect flood peaks and inundation.

Still “how much impact historic land cover change in Kerala had on the severity of flood in August 2018 is yet to be understood,” the study says.

The situation of reservoirs might have played a key role in at least worsening the flood situation.

However, other climate experts do not agree saying that all extreme weather events need not be a result of local warming.

Source- India Science Wire; edited by Clean Future Team

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