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DOI	10.5194/acp-20-4477-2020
	Effects of SO2 on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions
	Zhang W.; Wang W.; Li J.; Peng C.; Li K.; Zhou L.; Shi B.; Chen Y.; Liu M.; Ge M.
发表日期	2020
ISSN	1680-7316
起始页码	4477
结束页码	4492
卷号	20 期号:7
英文摘要	Secondary organic aerosol (SOA) has great impacts on air quality, climate change and human health. The composition and physicochemical properties of SOA differ greatly because they form under different atmospheric conditions and from various precursors as well as differing oxidation. In this work, photooxidation experiments of toluene were performed under four conditions (dry, dry with SO2, wet and wet with SO2) to investigate the effect of SO2 under different relative humidities on the composition and optical properties of SOA at wavelengths of 375 and 532 nm. According to our results, the increase in humidity enhances not only light absorption but also the scattering property of the SOA. Oligomers formed through multiphase reactions might be the reason for this phenomenon. Adding SO2 slightly lowers the real part of the complex refractive index, RI(n), of toluene-derived SOA (RI(n)dry; SO2< RI.n/dry, RI(n)wet; SO2< RI.n/wet), which might be a result of the partitioning of low-oxidation-state products. The imaginary part of the complex refractive index, RI(k), is enhanced under dry conditions with SO2 compared to that of only dry conditions, which might be due to acid-catalyzed aldol condensation reactions. Wet conditions with SO2shows the combined effect of SO2 and humidity. The extinction properties of toluene-derived SOA under wet conditions with SO2 increased by approximately 30% compared to that of toluene-derived SOA formed under dry conditions. Our results suggest that various atmospheric conditions will affect the composition and optical proprieties of SOA, which has significant implications for evaluating the impacts of SOA on the rapid formation of regional haze, global radiative balance and climate change. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; aerosol composition; air quality; climate change; formation mechanism; haze; optical property; photooxidation; physicochemical property; radiation balance; relative humidity; sulfur dioxide; toluene
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/141406
作者单位	State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Air Quality Research Division, Environment and Climate Change Canada, Toronto, ON M3H 5T4, Canada; College of Architecture and Environment, Sichuan University, Chengdu, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute (PSI), Villigen, 5232, Switzerland
推荐引用方式 GB/T 7714	Zhang W.,Wang W.,Li J.,et al. Effects of SO2 on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions[J],2020,20(7).
APA	Zhang W..,Wang W..,Li J..,Peng C..,Li K..,...&Ge M..(2020).Effects of SO2 on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions.Atmospheric Chemistry and Physics,20(7).
MLA	Zhang W.,et al."Effects of SO2 on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions".Atmospheric Chemistry and Physics 20.7(2020).