2016~2020年上海市PM<sub>2.5</sub>化学组成特征和来源解析

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Abstract A systematic observation of particulate matter was carried out from 2016 to 2020 at six urban and suburban sites in Shanghai. Chemical species including water-soluble ions, organic carbon/elemental carbon, and inorganic elements of fine particulate matter (PM_2.5) were analyzed. Source apportionment of PM_2.5 was conducted using the Positive Matrix Factorization model. Results show that the annual PM_2.5 mass concentrations of Shanghai from 2016 to 2020 were 46, 43, 37, 40, and 39μg/m^-3 successively, exhibiting a decreasing annual trend and spatiotemporal features of higher in the west and in winter while lower in the east and in summer. Organic aerosol was the most abundant species in PM_2.5 (30%~32%), with small annual and seasonal variations. Secondary inorganic ions including sulfate, nitrate and ammonium showed an evidently regional characterization. Among all the inorganic species, nitrate played an important role in pollution episode in winter, and its proportion increased the most from 2016 to 2020. Nine PM_2.5 sources were identified, including secondary nitrate (30.6%), secondary sulfate (20.7%), vehicle emission (12.6%), industry (8.0%), biomass burning (7.7%), dust (6.5%), coal combustion (5.8%), sea salt (4.8%) and ship emission (3.2%). Owing to the atmospheric emission control strategies, the contributions of mobile sources including vehicle and ship emissions as well as biomass burning sources including straw burning and fireworks emission showed a decreasing trend during the focused period.

Key words： fine particulate matter (PM_2.5) Shanghai chemical species source apportionment

Received: 05 April 2022

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X513

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	ZHAO Qian-biao
	HU Ming
	FU Qing-yan

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ZHAO Qian-biao,HU Ming,FU Qing-yan. Chemical characterization and source apportionment of fine particulate matter in Shanghai during 2016~2020[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5036-5046.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5036

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