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DOI	10.5194/acp-19-4061-2019
	Insights into the O: C-dependent mechanisms controlling the evaporation of α-pinene secondary organic aerosol particles
	Buchholz A.; Lambe A.T.; Ylisirniö A.; Li Z.; Tikkanen O.-P.; Faiola C.; Kari E.; Hao L.; Luoma O.; Huang W.; Mohr C.; Worsnop D.R.; Nizkorodov S.A.; Yli-Juuti T.; Schobesberger S.; Virtanen A.
发表日期	2019
ISSN	16807316
起始页码	4061
结束页码	4073
卷号	19 期号:6
英文摘要	The volatility of oxidation products of volatile organic compounds (VOCs) in the atmosphere is a key factor to determine if they partition into the particle phase contributing to secondary organic aerosol (SOA) mass. Thus, linking volatility and measured particle composition will provide insights into SOA formation and its fate in the atmosphere. We produced α-pinene SOA with three different oxidation levels (characterized by average oxygen-to-carbon ratio; O V C D 0:53, 0.69, and 0.96) in an oxidation flow reactor. We investigated the particle volatility by isothermal evaporation in clean air as a function of relative humidity (RH < 2 %, 40 %, and 80 %) and used a filter-based thermal desorption method to gain volatility and chemical composition information. We observed reduced particle evaporation for particles with increasing O V C ratio, indicating that particles become more resilient to evaporation with oxidative aging. Particle evaporation was increased in the presence of water vapour and presumably particulate water; at the same time the resistance of the residual particles to thermal desorption was increased as well. For SOA with O V C D 0:96, the unexpectedly large increase in mean thermal desorption temperature and changes in the thermogram shapes under wet conditions (80% RH) were an indication of aqueous phase chemistry. For the lower O V C cases, some water-induced composition changes were observed. However, the enhanced evaporation under wet conditions could be explained by the reduction in particle viscosity from the semi-solid to liquid-like range, and the observed higher desorption temperature of the residual particles is a direct consequence of the increased removal of high-volatility and the continued presence of lowvolatility compounds. © Author(s) 2019.
语种	英语
scopus关键词	aerosol composition; carbon; evaporation; oxidation; partitioning; volatile organic compound
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/144529
作者单位	Department of Applied Physics, University of Eastern Finland, Kuopio, Finland; Aerodyne Research Inc., Billerica, MA, United States; Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, United States; Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany; Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden; Department of Chemistry, University of California, Irvine, CA, United States
推荐引用方式 GB/T 7714	Buchholz A.,Lambe A.T.,Ylisirniö A.,et al. Insights into the O: C-dependent mechanisms controlling the evaporation of α-pinene secondary organic aerosol particles[J],2019,19(6).
APA	Buchholz A..,Lambe A.T..,Ylisirniö A..,Li Z..,Tikkanen O.-P..,...&Virtanen A..(2019).Insights into the O: C-dependent mechanisms controlling the evaporation of α-pinene secondary organic aerosol particles.Atmospheric Chemistry and Physics,19(6).
MLA	Buchholz A.,et al."Insights into the O: C-dependent mechanisms controlling the evaporation of α-pinene secondary organic aerosol particles".Atmospheric Chemistry and Physics 19.6(2019).