北京市典型区域大气亚微米颗粒物理化特性及其来源

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Abstract An Aerodyne Aerosol Chemical Speciation Monitor ACSM was deployed to continuously monitor the concentrations of non-refractory submicron particulate matter NR-PM₁ and its species in March, August, October and December representing spring, late summer, autumn, and winter, respectively, in the southeast urban area of Beijing. The evolution characteristics of NR-PM₁ and its species in different periods, especially during the haze days, and the sources of organic aerosol OA in the four seasons were investigated. The results showed that the average concentration of NR-PM₁ was 22.06μg/m³ in the whole study period. The seasonal variation of NR-PM₁ mass concentrations followed the order of spring > winter > autumn > late summer. In the study period, the average concentration of Org was 7.12μg/m³, accounting for 32.30% of NR-PM₁; the average concentrations of NO₃^- and SO₄^2- were 5.91 and 6.20μg/m³, respectively, accounting for 26.80% and 28.12% of NR-PM₁ respectively; however, the average mass concentrations and mass fractions of both NH₄⁺ and Cl^- were lower. All species concentrations showed the order of Org > SO₄^2-~NO₃^-> NH₄⁺> Cl^-. NR-PM₁ in clean days was mainly characterized by Org, and the diurnal variations of all species in each season were smaller. However, NR-PM₁ in haze days was mainly characterized by secondary inorganic species, and each species showed different diurnal variations in different seasons. OA species apportioned in different seasons were slightly different. The contributions of primary OA (POA) to OA gradually increased in the order of spring < late summer < autumn < winter, but secondary OA (SOA) to OA gradually decreased.

Key words： ACSM NR-PM₁ OA secondary inorganic species source

Received: 20 December 2021

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X513

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	Articles by authors
	HAN Li-hui
	SHI Rui-fang
	CUI Jian-shuo
	YANG Xue-mei
	WANG Hai-yan
	CHENG Shui-yuan

Cite this article:

HAN Li-hui,SHI Rui-fang,CUI Jian-shuo等. Physicochemical characteristics and sources of atmospheric submicro particulate matter at a typical area in Beijing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3522-3535.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3522

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