PMF model based atmospheric aerosol light extinction budget source apportionment study in Wuhan.
XIA Rui1,2, TAN Jian1,2, WANG Qiong-qiong3, WU Dui1,2, KONG Shao-fei4,5, CHEN Nan5,6, DENG Tao7, TAO Li-ping1,2, ZHANG Xue1,2, WU Bo-xi1,2, WU Liang-bin1,2, WANG Qing1,2, WU Cheng1,2
1. Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Engineering Research Center for On-Line Source Apportionment System of Air Pollution, Jinan University, Guangzhou 510632, China; 2. Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 510632, China; 3. Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong 999077, China; 4. Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan, 430078, China; 5. Research Centre for Complex Air Pollution of Hubei Province, Wuhan 430074, China; 6. Eco-Environmental Monitoring Centre of Hubei Province, Wuhan 430074, China; 7. Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China
Abstract：Online observation data from Wuhan in July (summer) and October (autumn) in 2020 was used to quantify the source contribution of PM2.5 on light extinction coefficients by inputting the optical parameters and chemical components of PM2.5 into the positive matrix factorization (PMF) model. This study found that the dominating contributing sources of light absorption coefficient were vehicles (66.3%) and industry (14.2%). For light scattering coefficient, the major contributors were secondary inorganic aerosol Ⅰ (38.4%) and vehicle (27.0%). The source contribution on light scattering showed clear seasonal variations, as the contribution from secondary inorganic aerosol Ⅰ was notably lower in summer (14.6%) than in autumn (47.4%). As for the light extinction coefficient, vehicles (37.2%) and secondary inorganic aerosol Ⅱ (21.2%) were the major contributors in summer, while secondary inorganic aerosol Ⅰ (44.7%) and vehicles (26.7%) were the dominating sources in autumn. The absorption Ångström exponent (AAE) values for several important sources were also obtained in this study, including vehicles (0.96), industry (1.04), dust (1.39), and biomass burning (2.24).
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