成都春季气溶胶理化性质及不同时段污染特征

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Abstract

A continuous observation of air pollution was made in Chengdu using single particle aerosol mass spectrometer (SPAMS) and a variety of online devices in spring of 2017. The results showed that the average mass concentrations of PM_2.5 and PM₁₀ were (62±25) and (90±40)μg/m³, respectively. Single particles in the atmosphere can be divided into eight classes. Due to the differences in emission sources and aging process, there were obvious differences in mass spectrum characteristics and particle size distribution among all particle classes. The comparative analysis of the selected fine particle pollution, mixed pollution of fine and coarse particles (mixed pollution) and clean periods showed that:(1) the contribution of potassium-elemental carbon (KEC) particles was the highest in the fine particle pollution periods (42.8%~46.3%). Compared with the clean period, the contribution of carbonaceous particles from combustion process decreased in the mixed pollution period, but the contribution of DUST particles reached the highest of all periods. (2) Compared with the clean period, the mixing degree of most particles with secondary inorganic components in other two types of periods enhanced. (3) The air masses from the southwest of Chengdu dominated in fine particle pollution periods, the heavily polluted areas in southern Sichuan contributed greatly to the pollution process in Chengdu.

Key words： single particle aerosol chemical composition mixing state air mass transport Chengdu

Received: 24 May 2019

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X513

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	Articles by authors
	LIU Qin
	ZHANG Jun-ke
	HUANG Xiao-juan
	LUO Jin-qi
	LUO Bin
	ZHANG Wei
	SONG Hong-yi

Cite this article:

LIU Qin,ZHANG Jun-ke,HUANG Xiao-juan等. The physicochemical properties of aerosol and its pollution characteristics in different periods in spring in Chengdu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 5009-5017.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I12/5009

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