New Delhi: While the health and economic impacts of air pollution have been well documented over the past decade, a new study has thrown light on the possibility of its impact on the monsoon too.
The increase in anthropogenic aerosols can cause a reduction in the average monsoon rainfall by 10% to 15% in the coming years.
According to a recent report, “anthropogenic aerosols and the weakening of the summer of South Asia”, the rain of the monsoon was carried by a large-scale wind pattern carrying the heat between the northern hemisphere and South.
When the headbreak north above the Indian Ocean during the summer of North Hemisphere, they took moisture, which fell during rain in South and Southeast Asia.
However, air pollution can weaken this remote wind pattern because it reflects the sun back into space, cools a polluted area.
“Thick aerosol pollution in Europe in the summer ensures the northern hemisphere is not much warmer than the south; so, nobody drove the wind – and no one triggered a monsoon.
The unpredictable monsoon ‘is more worrying’ than the overall decline in rainfall because Leading on one-year drought is followed by the next flood, testing the ability to build and adaptability to prepare for this change, “study countries.
This concern has also been raised in the UN intergovernmental panel report recently in the climate change report, “Climate change 2021: Basic physical science”.
According to the IPCC, the results of the climate model show that the forcing anthropogenic aerosol has dominated a recent decline in summer precipitation.
Data from the last three decades of the rainy season showed that there had been a gradual decline in the average annual monsoon rainfall.
Meanwhile 881mm in the period 1981 to 1990, it dropped to 877mm in the 1991-2000 decade.
In the next decade, falling to 847mm and the last decade (2011-2020) has recorded 860 mm, mostly saved by high rainfall recorded in 2019 and 2020.
Dr.
Dilip Ganguly, Associate Professor at the Atmospheric Science Center in IIT Delhi , estimates air pollution to reduce Southwest Monsoon’s rainfall by 10-15% for all countries in the coming years.
“Meanwhile, some places might even see rain down as high as 50% and will also have an impact on the overall monsoon dynamics – for example delaying the onset,” Ganguly said.
S N Tripathi, Head of Department (Civil Engineering) in IIT Kanpur, has the same view, the area that states with more pollution is likely to be affected.
“Southwest Monsun is driven by the difference between soil and sea temperatures.
The presence of large-scale aerosols on mainland India will lead to groundwind dimming.
The whole process will lead to the weakening of the monsun dynamics as a whole,” Tripathi said.
Bad water can cause a weaker monsoon, find a new study
