气候变化领域集成服务门户(CCPortal): Closure Investigation on Cloud Condensation Nuclei Ability of Processed Anthropogenic Aerosols

CCPortal

DOI	10.1029/2020JD032680
	Closure Investigation on Cloud Condensation Nuclei Ability of Processed Anthropogenic Aerosols
	Hu D.; Liu D.; Zhao D.; Yu C.; Liu Q.; Tian P.; Bi K.; Ding S.; Hu K.; Wang F.; Wu Y.; Wu Y.; Kong S.; Zhou W.; He H.; Huang M.; Ding D.
发表日期	2020
ISSN	2169897X
卷号	125 期号:15
英文摘要	Whether the cloud condensation nuclei (CCN) ability of aerosol could be predicted by compositions has been long debated. Measurements of submicron aerosol compositions and size-resolved CCN activation fraction were conducted at a mountain site (1,344 m) near Beijing region during wintertime. The site is influenced in the noon-afternoon by ground anthropogenic sources through convective mixing (CM) and for certain period received aged pollutants by regional advection (RA). By comparing the measured CCN-derived hygroscopicity parameter (κCCNc) with that predicted using chemical composition in bulk (κchem), we found for CM period, κchem overpredicted κCCNc by 71 ± 11% (25 ± 13%) at SS = 0.1% (0.3%); whereas for RA-only period, κchem underpredicted by 13 ± 6% (18 ± 11%) at SS = 0.1% (0.3%). The former, representing fresher aerosols in smaller size, could be explained by not considering the size-resolved composition, as the bulk measurement mainly reflects the features of larger particle. The latter is proved to result from the depression of droplet surface tension by potential surface-active organics and the possible liquid-liquid phase separation occurring at moderate RH, and a use of depressed surface tension (than pure water) of 0.063 ± 0.002 J m−2 would reach an agreement. We propose that a hybrid approach combining size-resolved composition and reduced surface tension, for fresher and aged sources, respectively, should improve the estimation of aerosol CCN ability. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185856
作者单位	Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, China; Department of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom; Beijing Weather Modification Office, Beijing, China; Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Department of Atmospheric Science, School of Environmental Sciences, China University of Geosciences, Wuhan, China
推荐引用方式 GB/T 7714	Hu D.,Liu D.,Zhao D.,et al. Closure Investigation on Cloud Condensation Nuclei Ability of Processed Anthropogenic Aerosols[J],2020,125(15).
APA	Hu D..,Liu D..,Zhao D..,Yu C..,Liu Q..,...&Ding D..(2020).Closure Investigation on Cloud Condensation Nuclei Ability of Processed Anthropogenic Aerosols.Journal of Geophysical Research: Atmospheres,125(15).
MLA	Hu D.,et al."Closure Investigation on Cloud Condensation Nuclei Ability of Processed Anthropogenic Aerosols".Journal of Geophysical Research: Atmospheres 125.15(2020).