Marine heatwaves are on the increase in the Indian Ocean, a study by researchers from the Indian Institute of Tropical Meteorology at Pune found, which affects the Indian monsoon rainfall.
It will affect Indian monsoon rains.
According to Koll, ocean heatwaves in the western Indian Ocean and the Bay of Bengal are causing drought across the central Indian subcontinent.
At the same time, there has been a marked increase in precipitation over the southern peninsula of India as a reaction against heatwaves in the northern Bay of Bengal.
In view of the increasing frequency and intensity of marine heatwaves, it is necessary to improve marine observations and refresh weather models, according to the researchers.
An underwater survey found that 85 per cent of coral in the Bay of Mannar, close to the Tamil Nadu coast, had bleached following the heat wave in May 2020.
The increasing intensity of severe cyclonic storms with large socio-economic impacts is attributable to atmospheric parameters ranging from higher relative relative humidity in particular, to low vertical wind shear, and warm ocean surface temperatures, the study said.