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DOI	10.5194/acp-21-11303-2021
	Phase state of secondary organic aerosol in chamber photo-oxidation of mixed precursors
	Wang Y.; Voliotis A.; Shao Y.; Zong T.; Meng X.; Du M.; Hu D.; Chen Y.; Wu Z.; Alfarra M.R.; McFiggans G.
发表日期	2021
ISSN	1680-7316
起始页码	11303
结束页码	11316
卷号	21 期号:14
英文摘要	The phase behaviour of aerosol particles plays a profound role in atmospheric physicochemical processes, influencing their physical and optical properties and further impacting climate and air quality. However, understanding of the aerosol phase state is still incomplete, especially that of multicomponent particles which contain inorganic compounds and secondary organic aerosol (SOA) from mixed volatile organic compound (VOC) precursors. We report measurements conducted in the Manchester Aerosol Chamber (MAC) to investigate the aerosol rebounding tendency, measured as the bounce fraction, as a surrogate of the aerosol phase state during SOA formation from photo-oxidation of biogenic (α-pinene and isoprene) and anthropogenic (o-cresol) VOCs and their binary mixtures on deliquescent ammonium sulfate seed. Aerosol phase state is dependent on relative humidity (RH) and chemical composition (key factors determining aerosol water uptake). Liquid (bounce fraction; BF < 0.2) at RH > 80 % and nonliquid behaviour (BF > 0.8) at RH < 30 % were observed, with a liquid-to-nonliquid transition with decreasing RH between 30 % and 80 %. This RH-dependent phase behaviour (RHBFCombining double low line0.2,0.5,0.8) increased towards a maximum, with an increasing organic-inorganic mass ratio (MRorg/inorg) during SOA formation evolution in all investigated VOC systems. With the use of comparable initial ammonium sulfate seed concentration, the SOA production rate of the VOC systems determines the MRorg/inorg and, consequently, the change in the phase behaviour. Although less important than RH and MRorg/inorg, the SOA composition plays a second-order role, with differences in the liquid-to-nonliquid transition at moderate MRorg/inorg of ~1 observed between biogenic-only (anthropogenic-free) and anthropogenic-containing VOC systems. Considering the combining role of the RH and chemical composition in aerosol phase state, the BF decreased monotonically with increasing hygroscopic growth factor (GF), and the BF was ~0 when GF was larger than 1.15. The real atmospheric consequences of our results are that any processes changing ambient RH or MRorg/inorg (aerosol liquid water) will influence their phase state. Where abundant anthropogenic VOCs contribute to SOA, compositional changes in SOA may influence phase behaviour at moderate organic mass fraction (~50 %) compared with purely biogenic SOA. Further studies are needed on more complex and realistic atmospheric mixtures. © 2021 Copernicus GmbH. 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/246700
作者单位	Centre for Atmospheric Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, United Kingdom; State Key Joint Laboratory of Environmental Simulation and Pollution Control, International Joint Laboratory for Regional Pollution Control, Ministry of Education (IJRC), College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom; International Joint Laboratory for Regional Pollution Control, Jülich, 52425, Germany; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing, 210044, China; National Centre for Atmospheric Science, School of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, United Kingdom; Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Doha, Qatar; Beijing, 100871, China...
推荐引用方式 GB/T 7714	Wang Y.,Voliotis A.,Shao Y.,et al. Phase state of secondary organic aerosol in chamber photo-oxidation of mixed precursors[J],2021,21(14).
APA	Wang Y..,Voliotis A..,Shao Y..,Zong T..,Meng X..,...&McFiggans G..(2021).Phase state of secondary organic aerosol in chamber photo-oxidation of mixed precursors.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(14).
MLA	Wang Y.,et al."Phase state of secondary organic aerosol in chamber photo-oxidation of mixed precursors".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.14(2021).