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DOI	10.5194/acp-21-13019-2021
	Measurement report: Cloud condensation nuclei activity and its variation with organic oxidation level and volatility observed during an aerosol life cycle intensive operational period (ALC-IOP)
	Mei F.; Wang J.; Zhou S.; Zhang Q.; Collier S.; Xu J.
发表日期	2021
ISSN	1680-7316
起始页码	13019
结束页码	13029
卷号	21 期号:17
英文摘要	Cloud condensation nuclei (CCN) spectrum and the CCN activated fraction of size-resolved aerosols (SR-CCN) were measured at a rural site on Long Island during the Department of Energy (DOE) aerosol life cycle intensive operational period (ALC-IOP) from 15 July to 15 August 2011. During the last week of the ALC-IOP, the dependence of the activated fraction on aerosol volatility was characterized by sampling downstream of a thermodenuder (TD) operated at temperatures up to 100 C. Here we present aerosol properties, including aerosol total number concentration, CCN spectrum, and the CCN hygroscopicity, for air masses of representative origins during the ALC-IOP. The hygroscopicity of organic species in the aerosol is derived from CCN hygroscopicity and chemical composition. The dependence of organic hygroscopicity on the organic oxidation level (e.g., atomic O:C ratio) agrees well with theoretical predictions and results from previous laboratory and field studies. The derived κorg and O:C ratio first increase as TD temperature increases from 20 C (i.e., ambient temperature) to 50 or 75 C and then decrease as TD temperature further increases to 100 C. The initial increases of O:C and κorg with TD temperature below 50 C are likely due to evaporation of more volatile organics with relatively lower O:C and hygroscopicity such as primary organic aerosol. At the high TD temperatures, the decreases of O:C and κorg indicate that evaporated organics were more oxygenated and had lower molecular weights. These trends are different from previous laboratory experiments and field observations, which reported that organic O:C increased monotonically with increasing TD temperature, whereas κorg decreased with the TD temperature. One possible reason is that previous studies were either focused on laboratory-generated secondary organic aerosol (SOA) or based on field observations at locations more dominated by SOA. © 2021 The Author(s).
语种	英语
scopus关键词	aerosol composition; aerosol formation; cloud condensation nucleus; hygroscopicity; oxidation; temperature profile
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246613
作者单位	Pacific Northwest National Laboratory, Richland, WA 99352, United States; Environmental and Climate Science Department, Brookhaven National Laboratory, Upton, NY 11973, United States; Department of Environmental Toxicology, University of California, 1 Shields Ave., Davis, CA 95616, United States; Center for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, United States; Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, United States; California Air Resources Board, 1001 I Street, Sacramento, CA, United States; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, 730000, China
推荐引用方式 GB/T 7714	Mei F.,Wang J.,Zhou S.,et al. Measurement report: Cloud condensation nuclei activity and its variation with organic oxidation level and volatility observed during an aerosol life cycle intensive operational period (ALC-IOP)[J]. 中国科学院西北生态环境资源研究院,2021,21(17).
APA	Mei F.,Wang J.,Zhou S.,Zhang Q.,Collier S.,&Xu J..(2021).Measurement report: Cloud condensation nuclei activity and its variation with organic oxidation level and volatility observed during an aerosol life cycle intensive operational period (ALC-IOP).ATMOSPHERIC CHEMISTRY AND PHYSICS,21(17).
MLA	Mei F.,et al."Measurement report: Cloud condensation nuclei activity and its variation with organic oxidation level and volatility observed during an aerosol life cycle intensive operational period (ALC-IOP)".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.17(2021).