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Brown Carbon Light Absorption over India: Research Status and Need for Discerning Climate Impacts
Chimurkar Navinya1, Taveen Singh Kapoor2, Chandra Venkataraman1,3
1Centre for Climate Studies, Indian Institute of Technology Bombay, Mumbai, India 400076.
ACS ES&T Air
|July 17, 2025
Summary
Brown carbon (BrC) significantly impacts India's climate, primarily from biomass burning and vehicle emissions. Further research is crucial for accurate climate impact assessments.
Area of Science:
- Atmospheric Chemistry
- Climate Science
- Environmental Science
Background:
- Brown carbon (BrC) is a significant atmospheric pollutant in India, absorbing solar radiation and influencing regional and global climate dynamics.
- Existing research has explored BrC's spatial-temporal variability and emission sources, but a comprehensive understanding of its climate impact remains incomplete.
Purpose of the Study:
- To synthesize current research on Brown carbon (BrC) in India.
- To identify knowledge gaps concerning BrC's measurement, sources, and radiative impacts.
- To inform future research for a better understanding of BrC's climate effects.
Main Methods:
- Literature synthesis of available studies on Brown carbon (BrC) in India.
- Analysis of measurement techniques, including solvent extraction, Ångström exponent extrapolation, and component subtraction.
- Review of studies on emission sources and radiative forcing assessments.
Main Results:
- Measurement sites are concentrated in the Indo-Gangetic plains, exhibiting higher absorption levels.
- Increased BrC absorption is observed during postmonsoon and winter, especially in peninsular India.
- Biomass burning and vehicular emissions are identified as primary BrC sources, contributing substantially to warming (31-48%) in the Indo-Gangetic plains.
Conclusions:
- Expanded spatial monitoring and diverse source characterization are essential for accurate BrC assessment in India.
- Current global climate models may inaccurately represent BrC over India due to reliance on non-Indian data.
- Improved radiative effect estimations are critical for understanding BrC's climate impact both regionally and globally.
Keywords:
biomass burningcarbonaceous aerosolsclimate changeoptical propertiesorganic carbonparticulate matterpollutionspectrophotometryMore Related Videos
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