气候变化领域集成服务门户(CCPortal): Spatial variability of air pollutants in a megacity characterized by mobile measurements

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DOI	10.5194/acp-22-7389-2022
	Spatial variability of air pollutants in a megacity characterized by mobile measurements
	Khuzestani, Reza Bashiri; Liao, Keren; Liu, Ying; Miao, Ruqian; Zheng, Yan; Cheng, Xi; Jia, Tianjiao; Li, Xin; Chen, Shiyi; Huang, Guancong; Chen, Qi
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	7389
结束页码	7404
卷号	22 期号:11 页码:16
英文摘要	Characterization of the spatial distributions of air pollutants on an intracity scale is important for understanding local sources, secondary formation, and human exposure. In this study, we conducted in situ mobile measurements for the chemical composition of fine particles, volatile organic compounds (VOCs), oxygenated VOCs (OVOCs), and common gas pollutants in winter in the megacity of Beijing. The spatial patterns of these pollutants under different pollution conditions were investigated. During the non-haze days all pollutants showed significant spatial variability. Large spatial variations of secondary species including OVOCs and secondary aerosol species highlight the chemical heterogeneity. In particular, the inorganic chemical composition of fine particles varied greatly on the 65 km urban highway, suggesting a wide range of particle neutralization in the megacity of Beijing. Localized sources such as vehicle, cooking, and industrial emissions led to hot spots and nonuniform distributions of primary pollutants in the city. The spatial heterogeneity of air pollutants under less polluted conditions calls for a future need of using fine-resolution models to evaluate human exposure and to develop pollution control strategies. During the haze day the spatial variabilities of secondary gaseous and particulate pollutants were largely reduced, explained by both the elevated urban background of the polluted air mass and the enhanced secondary formation by elevated precursor concentrations and heterogeneous or aqueous pathways. Although localized primary emissions were accumulated under stagnant haze conditions, the chemical composition of fine particles became relatively homogeneous because of the predominant secondary contributions. A uniform spatial pattern of particle neutralization was observed. The concentrations of hydrocarbons and less oxygenated OVOCs showed good positive spatiotemporal correlations during the haze day, while the concentrations of more oxygenated OVOCs showed good positive correlations among themselves but moderate negative correlations with the concentrations of hydrocarbons, less oxygenated OVOCs, and aerosol species. Our results indicate a spatial chemical homogeneity on the megacity scale to promote efficient secondary organic aerosol (SOA) production under haze conditions.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000807592000001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273233
作者单位	Peking University; Peking University; Shahid Beheshti University
推荐引用方式 GB/T 7714	Khuzestani, Reza Bashiri,Liao, Keren,Liu, Ying,et al. Spatial variability of air pollutants in a megacity characterized by mobile measurements[J],2022,22(11):16.
APA	Khuzestani, Reza Bashiri.,Liao, Keren.,Liu, Ying.,Miao, Ruqian.,Zheng, Yan.,...&Chen, Qi.(2022).Spatial variability of air pollutants in a megacity characterized by mobile measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(11),16.
MLA	Khuzestani, Reza Bashiri,et al."Spatial variability of air pollutants in a megacity characterized by mobile measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.11(2022):16.