气候变化领域集成服务门户(CCPortal): Measurement report: Effects of photochemical aging on the formation and evolution of summertime secondary aerosol in Beijing

CCPortal

DOI	10.5194/acp-21-1341-2021
	Measurement report: Effects of photochemical aging on the formation and evolution of summertime secondary aerosol in Beijing
	Chen T.; Liu J.; Ma Q.; Chu B.; Zhang P.; Ma J.; Liu Y.; Zhong C.; Liu P.; Wang Y.; Mu Y.; He H.
发表日期	2021
ISSN	1680-7316
起始页码	1341
结束页码	1356
卷号	21 期号:2
英文摘要	Atmospheric submicrometer aerosols have a great effect on air quality and human health, while their formation and evolution processes are still not fully understood. Herein, the crucial role of atmospheric oxidation capacity, as characterized by OH exposure dose in the formation and evolution of secondary submicrometer aerosols, was systematically investigated based on a highly time-resolved chemical characterization of PM1 in a southern suburb of Beijing in summertime from 25 July to 21 August 2019. The averaged concentration of PM1 was 19.311.3 ugm3, and nearly half (48.3 %) of the mass was organic aerosols (OAs) during the observation period. The equivalent photochemical age (ta) estimated from the ratios of toluene to benzene was applied to characterize the OH exposure dose of the air mass, in which an observation period with the similar sources and minimal influence of fresh emission was adopted. The relationships of non-refractory PM1 species, OA factors (i.e., one hydrocarbon-like and three oxygenated organic aerosol factors) and elemental compositions (e.g., H=C, O=C, N=C, S=C, OM=OC, and OSc) to ta were analyzed in detail. It was found that higher PM1 concentration accompanied longer ta, with an average increase rate of 0.8 ugm3 h1. Meanwhile, the formation of sulfate and more oxidized oxygenated OA were most sensitive to the increase in ta, and their contributions to PM1 were enhanced from 22% to 28% and from 29% to 48 %, respectively, as ta increased. In addition, OSc and the ratios of O=C and OM=OC increased with the increase in ta. These results indicated that photochemical aging is a key factor leading to the evolution of OA and the increase in PM1 in summertime. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.
语种	英语
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/168796
作者单位	State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China; Beijing Institute of Petrochemical Technology, Beijing, 102617, China
推荐引用方式 GB/T 7714	Chen T.,Liu J.,Ma Q.,et al. Measurement report: Effects of photochemical aging on the formation and evolution of summertime secondary aerosol in Beijing[J],2021,21(2).
APA	Chen T..,Liu J..,Ma Q..,Chu B..,Zhang P..,...&He H..(2021).Measurement report: Effects of photochemical aging on the formation and evolution of summertime secondary aerosol in Beijing.Atmospheric Chemistry and Physics,21(2).
MLA	Chen T.,et al."Measurement report: Effects of photochemical aging on the formation and evolution of summertime secondary aerosol in Beijing".Atmospheric Chemistry and Physics 21.2(2021).