Influence of South Asian Biomass Burning on Ozone and Aerosol Concentrations Over the Tibetan Plateau

In this work, the influence of South Asian biomass burning emissions on O 3 and PM 2.5 concentrations over the Tibetan Plateau (TP) is investigated by using the regional climate chemistry transport model WRF-Chem. The simulation is validated by comparing meteorological fields and pollutant concentra...

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Bibliographic Details
Published in:Advances in atmospheric sciences 2022-07, Vol.39 (7), p.1184-1197
Main Authors: Yang, Junhua, Kang, Shichang, Hu, Yuling, Chen, Xintong, Rai, Mukesh
Format: Article
Language:English
Subjects:
Aerosol concentrations
Aerosols
Air pollution
Atmospheric chemistry
Atmospheric Sciences
Biomass
Biomass burning
Black carbon
Burning
Carbon
Chemistry
Climate models
Earth and Environmental Science
Earth Sciences
Emissions
Geophysics/Geodesy
Hydrology
Meteorology
Monsoons
Organic carbon
Original Paper
Ozone
Particulate matter
Plateaus
Pollutants
Regional climate models
Regional climates
Seasons
Third Pole Atmospheric Physics
Westerlies
Wind
Winds
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Summary:In this work, the influence of South Asian biomass burning emissions on O 3 and PM 2.5 concentrations over the Tibetan Plateau (TP) is investigated by using the regional climate chemistry transport model WRF-Chem. The simulation is validated by comparing meteorological fields and pollutant concentrations against in situ observations and gridded datasets, providing a clear perspective on the spatiotemporal variations of O 3 and PM 2.5 concentrations across the Indian subcontinent, including the Tibetan Plateau. Further sensitivity simulations and analyses show that emissions from South Asian biomass burning mainly affect local O 3 concentrations. For example, contribution ratios were up to 20% in the Indo-Gangetic Plain during the pre-monsoon season but below 1% over the TP throughout the year 2016. In contrast, South Asian biomass burning emissions contributed more than 60% of PM 2.5 concentration over the TP during the pre-monsoon season via significant contribution of primary PM 2.5 components (black carbon and organic carbon) in western India that were lofted to the TP by westerly winds. Therefore, it is suggested that cutting emissions from South Asian biomass burning is necessary to alleviate aerosol pollution over the TP, especially during the pre-monsoon season.
ISSN:0256-1530
1861-9533
DOI:10.1007/s00376-022-1197-0