基于PMF的武汉市大气细颗粒物消光来源解析

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Abstract Online observation data from Wuhan in July (summer) and October (autumn) in 2020 was used to quantify the source contribution of PM_2.5 on light extinction coefficients by inputting the optical parameters and chemical components of PM_2.5 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).

Key words： Wuhan extinction coefficient positive matrix factorization (PMF) source apportionment aerosol optical properties

Received: 05 June 2022

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	XIA Rui
	TAN Jian
	WANG Qiong-qiong
	WU Dui
	KONG Shao-fei
	CHEN Nan
	DENG Tao
	TAO Li-ping
	ZHANG Xue
	WU Bo-xi
	WU Liang-bin
	WANG Qing
	WU Cheng

Cite this article:

XIA Rui,TAN Jian,WANG Qiong-qiong等. PMF model based atmospheric aerosol light extinction budget source apportionment study in Wuhan.[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 7-19.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/7

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