海运低硫管控政策下青岛PM<sub>2.5</sub>和PM<sub>1</sub>金属元素污染特征及来源解析

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Abstract To identify the sources of atmospheric PM_2.5 and PM₁, daily observations were conducted in Qingdao during the summer and autumn-winter of 2021. Measurements at coastal and urban stations were performed. Source apportionment of metal elements in PM were performed by enrichment factor method and positive matrix factorization (PMF) model. The backward trajectory of air mass and potential source contribution function (PSCF) were adopted to analyze source region. The vanadium to nickel ratio was used to indicate ship emissions. The results showed that the concentrations of V and Ni in PM_2.5 and PM₁ in summer were significantly lower than those reported during DECA 1.0. The concentrations of V in PM₁ in autumn and winter were also lower than previous reports. Ni had more complex sources also affected by land emissions. According to PMF model results, ship emissions contributed to 11.1% and 8.4% of metal elements in PM_2.5 and PM₁ in summer, respectively. The V/Ni ratios in PM_2.5 and PM₁ of fresh marine air mass in summer were (0.71±0.24) and (1.06±0.65), respectively. The V/Ni ratio in PM₁ from marine air mass in autumn-winter was (0.54±0.24), which was significantly higher than those in the mixed air mass and inland air mass. Therefore the air mass history should be considered when using V/Ni ratio to assess the impact of ship emissions. The potential source regions of V and Ni in PM_2.5 and PM₁ located in Lianyungang, around Rizhao and Jiaozhou Bay of Qingdao, while in autumn and winter this mainly located around the Bohai Sea.

Key words： PM₁ ship emissions elemental metals source analysis V/Ni Qingdao

Received: 03 December 2022

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	TAO Wen-xin
	TAN Yu-ran
	ZHANG Yi-sheng
	YANG Jian-li
	LIU Zi-yang
	LIU Dan-tong
	DU Jin-hua
	HU Yu-sheng
	MA Zi-zhen
	PENG Liang
	ZHANG Hou-yong

Cite this article:

TAO Wen-xin,TAN Yu-ran,ZHANG Yi-sheng等. Characteristics and source analysis of PM_2.5 and PM₁ metal elements in Qingdao under marine low-sulfur regulation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3339-3349.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3339

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