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DOI	10.5194/acp-19-2933-2019
	Technical note: The role of evolving surface tension in the formation of cloud droplets
	Davies J.F.; Zuend A.; Wilson K.R.
发表日期	2019
ISSN	16807316
起始页码	2933
结束页码	2946
卷号	19 期号:5
英文摘要	The role of surface tension (σ) in cloud droplet activation has long been ambiguous. Recent studies have reported observations attributed to the effects of an evolving surface tension in the activation process. However, the adoption of a surface-mediated activation mechanism has been slow and many studies continue to neglect the composition dependence of aerosol-droplet surface tension, using instead a value equal to the surface tension of pure water (σw). In this technical note, we clearly describe the fundamental role of surface tension in the activation of multicomponent aerosol particles into cloud droplets. It is demonstrated that the effects of surface tension in the activation process depend primarily on the evolution of surface tension with droplet size, typically varying in the range 0.5σw≲σ ≲σw due to the partitioning of organic species with a high surface affinity. We go on to report some recent laboratory observations that exhibit behavior that may be associated with surface tension effects and propose a measurement coordinate that will allow surface tension effects to be better identified using standard atmospheric measurement techniques. Unfortunately, interpreting observations using theory based on surface film and liquid-liquid phase separation models remains a challenge. Our findings highlight the need for experimental measurements that better reveal the role of composition-dependent surface tensions, critical for advancing predictive theories and parameterizations of cloud droplet activation. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; cloud cover; cloud droplet; surface tension; water
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/144587
作者单位	Department of Chemistry, University of California, Riverside, CA, United States; Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, QC, Canada; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Davies J.F.,Zuend A.,Wilson K.R.. Technical note: The role of evolving surface tension in the formation of cloud droplets[J],2019,19(5).
APA	Davies J.F.,Zuend A.,&Wilson K.R..(2019).Technical note: The role of evolving surface tension in the formation of cloud droplets.Atmospheric Chemistry and Physics,19(5).
MLA	Davies J.F.,et al."Technical note: The role of evolving surface tension in the formation of cloud droplets".Atmospheric Chemistry and Physics 19.5(2019).