气候变化领域集成服务门户(CCPortal): Laboratory study of the collection efficiency of submicron aerosol particles by cloud droplets-Part I: Influence of relative humidity

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DOI	10.5194/acp-21-6945-2021
	Laboratory study of the collection efficiency of submicron aerosol particles by cloud droplets-Part I: Influence of relative humidity
	Dépée A.; Lemaitre P.; Gelain T.; Monier M.; Flossmann A.
发表日期	2021
ISSN	1680-7316
起始页码	6945
结束页码	6962
卷号	21 期号:9
英文摘要	. A new In-Cloud Aerosol Scavenging Experiment (In-CASE) has been conceived to measure the collection effi ciency (CE) of submicron aerosol particles by cloud droplets. In this setup, droplets fall at their terminal velocity through a 1 m high chamber in a laminar flow containing aerosol par ticles. At the bottom of the In-CASE chamber, the droplet train is separated from the aerosol particle flow droplets are collected in an impaction cup, whereas aerosol particles are deposited on a high-efficiency particulate air (HEPA) filter. The collected droplets and the filter are then analysed by flu orescence spectrometry since the aerosol particles are atom ised from a sodium fluorescein salt solution (C20H10Na2O5). In-CASE fully controls all the parameters which affect the CE the droplets and aerosol particles size distributions are monodispersed, the electric charges of droplets and aerosol particles are controlled, and the relative humidity is indi rectly set via the chamber s temperature. This novel In-CASE setup is presented here as well as the first measurements obtained to study the impact of relative humidity on CE. For this purpose, droplets and particles are electrically neu tralised. A droplet radius of 49.6 ± 1.3 m has been consid ered for six particle dry radii between 50 and 250 nm and three relative humidity levels of 71.1 ± 1.3 %, 82.4 ± 1.4 % and 93.5 ± 0.9 %. These new CE measurements have been compared to theoretical models from literature which ade quately describe the relative humidity influence on the mea sured CE. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; aerosol composition; aerosol formation; cloud droplet; laminar flow; particle size; relative humidity
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/246914
作者单位	Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, Gif-sur-Yvette91192, France; Université Clermont Auvergne, Laboratoire de Météorologie Physique, Clermont-Ferrand, France; CNRS, INSU, UMR, Aubière, 6016, France
推荐引用方式 GB/T 7714	Dépée A.,Lemaitre P.,Gelain T.,et al. Laboratory study of the collection efficiency of submicron aerosol particles by cloud droplets-Part I: Influence of relative humidity[J],2021,21(9).
APA	Dépée A.,Lemaitre P.,Gelain T.,Monier M.,&Flossmann A..(2021).Laboratory study of the collection efficiency of submicron aerosol particles by cloud droplets-Part I: Influence of relative humidity.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(9).
MLA	Dépée A.,et al."Laboratory study of the collection efficiency of submicron aerosol particles by cloud droplets-Part I: Influence of relative humidity".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.9(2021).