2 Minute Read

Aerosols in Indo-Gangetic plain have led to increase in high rainfall in Himalayan foothills: Study

Aerosols in Indo-Gangetic plain have led to increase in high rainfall in Himalayan foothills: Study

New Delhi, December 10

Scientists have found that aerosols like black carbon and dust, which make the Indo-Gangetic Plain one of the most polluted regions of the world, have led to increased incidents of high rainfall events in the foothills of the Himalayan region.

The study showed that particulate emissions can alter the physical and dynamical properties of cloud systems and, in turn, amplify rainfall events over orographic regions downwind of highly polluted urban areas.

The Indo-Gangetic Plain is located south and upwind of the Himalayan foothills.

The region is associated with high aerosol loading, much of which is black carbon and dust, and thus provides an opportunity for studying how aerosol affects extreme rainfall events, particularly when air mass is forced from a low elevation to a higher elevation as it moves over rising terrain technically called orographic forcing.

A team of researchers from National Institute of Technology Rourkela, Leipzig Institute for Meteorology (LIM), University of Leipzig, Germany, Indian Institute of Technology Madras, Indian Institute of Technology Kanpur supported by the Department of Science and Technology under its Climate Change programme have highlighted the crucial role of the aerosol direct radiative effect on high precipitation events over the Himalayan region.

The findings of the current work have been accepted for publishing in the scientific journal 'Atmospheric Chemistry and Physics' recently.

The study used 17 years (2001–2017) of rainfall rate, aerosol measurements called aerosol optical depth (AOD), meteorological reanalysis fields such as pressure, temperature, and moisture content at different altitudes to compute the thermodynamic variable “moist static energy” and outgoing long-wave radiation from Indian region to investigate high precipitation events on the foothills of the Himalayas.

The team found clear associations between high precipitation events, high aerosol loading, and high moist static energy (MSE) values (moist static energy of an air mass includes the potential energy due to its height above the ground and the latent heat due to its moisture content).

The findings also highlight the crucial role of the radiative effect of aerosol on high precipitation events over the Himalayan region.

The results of the study indicate that aerosols can play a vital role in exciting high precipitation (HP) events over the Himalayas during the monsoon season.

Thus, aerosols, including chemistry, are essential to consider when forecasting HP events over the Himalayan region in regional modelling studies, the study said. PTI 

Top Stories

LPG price hiked again by Rs 25, fourth increase in month’s time

LPG price hiked again by Rs 25, fourth increase in month’s time

Prices up by Rs 125 per 14.2-kg cylinder since the beginning...

Ruckus in Punjab Assembly over farm laws as Budget session begins

Ruckus in Punjab Assembly over farm laws as Budget session begins

Akalis raise slogans as Governor begins address; AAP MLAs ri...

Amidst border tension, Chinese hackers targeted India’s power through malware: US firm

Amidst border tension, Chinese hackers targeted India’s power through malware: US firm

Irresponsible to accuse a particular party when there is no ...

Prashant Kishor appointed principal adviser to Punjab CM

Prashant Kishor appointed principal adviser to Punjab CM

Kishor had played a crucial role in the 2017 state assembly ...

Modi takes first dose as age-specific Covid vaccine drive begins

Modi takes first dose as age-specific Covid vaccine drive begins

P Niveda from Puducherry administers Covaxin to the PM

Cities

View All