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LI Huiqin, LUO Meng, FAN Danhua, et al. 2024. Impact of Overseas Biomass Combustion on Atmospheric Fine Particulate Matter Content in Spring in Western Yunnan [J]. Climatic and Environmental Research (in Chinese), 29 (6): 744−754. DOI: 10.3878/j.issn.1006-9585.2024.23051
Citation: LI Huiqin, LUO Meng, FAN Danhua, et al. 2024. Impact of Overseas Biomass Combustion on Atmospheric Fine Particulate Matter Content in Spring in Western Yunnan [J]. Climatic and Environmental Research (in Chinese), 29 (6): 744−754. DOI: 10.3878/j.issn.1006-9585.2024.23051

Impact of Overseas Biomass Combustion on Atmospheric Fine Particulate Matter Content in Spring in Western Yunnan

  • Air pollution transmission and the impact of international biomass combustion on western Yunnan between March 2019 and February 2022 was investigated. The analysis is based on ground air quality measurements, meteorological observations, and MODIS satellite heat source points, using the TrajStat model and the regional atmospheric chemistry model WRF-Chem. The findings indicate that air quality in western Yunnan significantly deteriorates in winter and spring, with spring being the worst season due to high concentrations of pollutants, particularly particulate matter (PM2.5). MODIS data reveal an increase in overseas heat source points in spring, which, driven by westerly winds, significantly impacts western Yunnan. During the spring pollution period, over 80% of the pollution is associated with westerly wind trajectories originating from northern India, Bangladesh, and central and northern Myanmar, which carry the highest PM2.5 concentrations. Analysis using the Potential Source Contribution Function (PSCF) and Concentration-Weighted Trajectory (CWT) methods revealed that the main pollution source areas were concentrated in central and northern Myanmar to the west of Dehong, China, Northeast India, and eastern Bangladesh during the spring pollution period, with pollutant concentration contribution levels ranging from 70 μg/m3 to 120 μg/m3. These high-value areas of the Weighted PSCF (WPSCF) and the Weighted CWT (WCWT) accord with or are located downwind of heat-concentration zones. Simulations using the WRF-Chem model show that during a pollution event in western Yunnan, biomass combustion is the main source of PM2.5, accounting for about 71% of the simulated pollution period.
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