气候变化领域集成服务门户(CCPortal): Chemical composition, water content and size distribution of aerosols during different development stages of regional haze episodes over the North China Plain

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DOI	10.1016/j.atmosenv.2020.118020
	Chemical composition, water content and size distribution of aerosols during different development stages of regional haze episodes over the North China Plain
	Shen L.; Wang H.; Cheng M.; Ji D.; Liu Z.; Wang L.; Gao W.; Yang Y.; Huang W.; Zhang R.; Zou J.; Wang Y.
发表日期	2021
ISSN	1352-2310
卷号	245
英文摘要	Aerosol size distribution and chemical composition are found to have significant effects on its hygroscopicity, acidity/alkalinity and light extinction. Heavy haze pollution occurred frequently in the wintertime of NCP, with long duration time and large impact area, which had important influences on air quality and human health. However, the study concerning the formation mechanism and physicochemical characteristics of aerosols in different haze stages have been rarely carried out. In this study, aerosol size distribution in the range of 10 nm - 10 μm, water soluble inorganic ions (WSIIs), PM (PM2.5, PM10), trace gases, organic carbon (OC), elemental carbon (EC) and meteorological elements were derived during a regional haze pollution episode from Nov. 9 to 16, 2018. The aerosol water content and pH were further calculated using the ISORROPIA model. We divided the whole observation period into segments of clean days, fog processes, and haze processes, including three stages of I: accumulation, II: growth, and III: explosion, and a dry haze (D-haze) process based on the PM2.5 concentration, visibility and RH. Given the shift of particle size to larger segment ascribed to the ageing process during fog/haze process, the size distribution peak in aerosol number concentration was located at 100 nm in the fog/haze episode and was 70 nm larger than that on clean days. The concentration descended significantly in stage III, peaking at 160 nm, suggesting a strong aging process of aerosols. The PM2.5 increased sharply under high RH, static weather conditions and strengthening oxidation that favored liquid and heterogeneous reactions. The nitrate concentration was found to account for 20.5% (D-haze) - 29.0% (fog) of the total water soluble inorganic ions (WSIIs) during the fog/haze process, while sulfate constituted only 13.8% (stage III) - 21.3% (stage I), revealing dominant nitrate pollution. Hence, nitrate was considered to originate mainly from photochemical and heterogeneous reactions in haze episodes and was generated only by heterogeneous reactions. Higher (lower) aerosol water content made aerosols more acidic (alkaline) under similar chemical compositions. Therefore, the chemical reactions may differ under dry and wet haze pollution. Sources of carbonaceous aerosols changed in different haze stages with descending (enhancing) contributions from coal combustion (vehicle exhaust). © 2020 Elsevier Ltd
关键词	Aerosol Chemical composition Haze NCP Water content
语种	英语
scopus关键词	Aerosols; Air quality; Alkalinity; Coal combustion; Concentration (process); Fog; Light extinction; Nitrates; Organic carbon; Particle size; Photochemical reactions; Size distribution; Sulfur compounds; Trace elements; Aerosol size distributions; Carbonaceous aerosol; Chemical compositions; Heterogeneous reactions; Meteorological elements; Nitrate concentration; Physicochemical characteristics; Water soluble inorganic ions; Water pollution; coal; ion; nitrate; organic carbon; sulfate; aerosol; aging; air quality; coal combustion; deformation mechanism; elemental carbon; haze; organic carbon; particle size; size distribution; visibility; water content; acidity; air pollution; air quality; air sampling; alkalinity; Article; chemical composition; chemical reaction; China; combustion; gas; haze; health hazard; meteorological phenomena; particle size; particulate matter 10; pH; priority journal; water content; wettability; China; North China Plain
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248767
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science &Technology, Nanjing, 210044, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Xianghe Observatory of Whole Atmosphere, Institute of Atmospheric Physics, Chinese Academy of Sciences, Xianghe, 065400, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
推荐引用方式 GB/T 7714	Shen L.,Wang H.,Cheng M.,et al. Chemical composition, water content and size distribution of aerosols during different development stages of regional haze episodes over the North China Plain[J],2021,245.
APA	Shen L..,Wang H..,Cheng M..,Ji D..,Liu Z..,...&Wang Y..(2021).Chemical composition, water content and size distribution of aerosols during different development stages of regional haze episodes over the North China Plain.ATMOSPHERIC ENVIRONMENT,245.
MLA	Shen L.,et al."Chemical composition, water content and size distribution of aerosols during different development stages of regional haze episodes over the North China Plain".ATMOSPHERIC ENVIRONMENT 245(2021).