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LATEST NEWS UPDATES | How climate change is changing the Indian monsoon -Bibek Bhattacharya

How climate change is changing the Indian monsoon -Bibek Bhattacharya

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published Published on Jul 30, 2021   modified Modified on Aug 1, 2021

-Livemint Lounge

Climate change is making the monsoon more erratic and violent. Lounge speaks to experts to understand the forces shaping India's season of rains

When we talk about climate change impacts, the word that’s often used is “unprecedented”, that which can’t be measured by any given yardstick. Something unprecedented happened over the Western Ghats between 19-25 July. For about a week, a large section of the range, especially in Maharashtra, was deluged under a nearly never-ending barrage of extremely heavy rainfall that grew progressively more intense with each passing day.

It started with a low pressure area forming over the Bay of Bengal in mid-July. A common enough occurrence during the monsoon months of June to September, this low pressure area acted as an anchor for rain-bearing westerly winds from the Arabian Sea, which began flowing towards the trough. These winds were laden with high amounts of moisture from an overheated Arabian Sea where the sea surface temperatures at the time were 1-2 degrees Celsius above normal. As these winds rushed towards the low pressure area, they encountered the high range of the Western Ghats. And they dumped all their water.

Between 19-21 July, the amount of daily precipitation increased from 98mm on the 19th, to 110mm on the 20th and then 164mm on the 21st. Such large amounts of daily rainfall would have anyway qualified as an extremely heavy rainfall event. But worse was to come. On 22 July, the area received rains of 480mm. And on 23 July, 594mm of rain was dumped over the Western Ghats. This had become an extreme rainfall event, with cataclysmic results.

As of 25 July, at least 112 people have been killed and 99 people remain missing. Across nine districts in Maharashtra, some 890 villages were badly affected. The worst calamities befell people living in the plains at the western foot of the Ghats, in the state’s Raigad, Ratnagiri and Sindhudurg districts. At least 42 people were killed in Raigad’s Taliye village, where a part of a local hillock collapsed in a landslide, burying over 30 houses. As rivers swelled and dams were filled to capacity and rain run-off washed down to the plains from the Ghats, cities like Chiplun in Ratnagiri were swept up in massive floods, with the water level rising high enough to inundate even the first floors of buildings. This was record rainfall. Mahabaleshwar’s previous daily precipitation record was in August 2008, when it saw rains of 497mm. People simply hadn’t experienced continuous rainfall like this in generations, with an earlier record of 439mm registered way back in 1977. Again, that word, unprecedented.

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Livemint Lounge, 30 July, 2021, https://lifestyle.livemint.com/news/big-story/dark-clouds-ahead-how-climate-change-is-changing-the-indian-monsoon-111627637725104.html?fbclid=IwAR03tORx8Ozy6tutBBVFzgBndlg7pXsxCI25iOdE4YNmYX67jM1qPrPXCRg


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