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DOI	10.1016/j.envpol.2018.11.101
	Spatial variability, mixing states and composition of various haze particles in atmosphere during winter and summertime in northwest China
	Dong, Zhiwen; Qin, Dahe; Li, Kaiming; Kang, Shichang; Wei, Ting; Lu, Junfeng
发表日期	2019
ISSN	0269-7491
EISSN	1873-6424
卷号	246
英文摘要	Pollutants, which are usually transported from urban cities to remote glacier basins, and aerosol impurities affect the earth's temperature and climate by altering the radiative properties of the atmosphere. This work focused on the physicochemical properties of atmospheric pollutants across the urban and remote background sites in northwest China. Information on individual particles was obtained using transmission electron microscopy (TEM) and energy dispersive X-ray spectrometry (EDX). Particle size and age-dependent mixing structures of individual particles in clean and polluted air were investigated. Aerosols were classified into eight components: mineral dust, black carbon (soot)/fly ash, sulfates, nitrates, NaCI salt, ammonium, organic matter, and metals. Marked spatial and seasonal changes in individual particle components were observed in the study area. Aerosol particles were generally found to be in the mixing state. For example, salt-coated particles in summer accounted for 31.2-44.8% of the total particles in urban sites and 37.5-74.5% of the total particles in background sites, while in winter, almost all urban sites comprised >50%, which implies a significant effect on the radiative forcing in the study area. We found that in PM2.5 section, the internally mixed black carbon/organic matter particles clearly increased with diameter. Moreover, urban cities were characterized by atmospheric particles sourced from anthropogenic activities, whereas background locations exhibited much lower aerosol concentrations and increased particle density, originating from natural crustal sources (e.g., mineral dust and NaCI salt), which, together with air mass trajectory analysis, indicates a potential spatial transport process and routes of atmospheric transport from urban cities to background locations. Thus, this work is of importance in evaluating atmospheric conditions in northwest China and northeast Tibetan Plateau regions, to discover the transport processes and facilitate improvements in climatic patterns concerning atmospheric impurities. (C) 2018 Elsevier Ltd. All rights reserved.
关键词	Atmospheric haze aerosol TEM-EDX Individual particle mixing states Urban sites in northwest China Remote background sites
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	ENVIRONMENTAL POLLUTION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112040
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Dong, Zhiwen,Qin, Dahe,Li, Kaiming,et al. Spatial variability, mixing states and composition of various haze particles in atmosphere during winter and summertime in northwest China[J]. 中国科学院西北生态环境资源研究院,2019,246.
APA	Dong, Zhiwen,Qin, Dahe,Li, Kaiming,Kang, Shichang,Wei, Ting,&Lu, Junfeng.(2019).Spatial variability, mixing states and composition of various haze particles in atmosphere during winter and summertime in northwest China.ENVIRONMENTAL POLLUTION,246.
MLA	Dong, Zhiwen,et al."Spatial variability, mixing states and composition of various haze particles in atmosphere during winter and summertime in northwest China".ENVIRONMENTAL POLLUTION 246(2019).