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DOI	10.5194/acp-19-15545-2019
	Impact of isolated atmospheric aging processes on the cloud condensation nuclei activation of soot particles
	Friebel F.; Lobo P.; Neubauer D.; Lohmann U.; Van Dusseldorp S.D.; Mühlhofer E.; Mensah A.A.
发表日期	2019
ISSN	16807316
起始页码	15545
结束页码	15567
卷号	19 期号:24
英文摘要	The largest contributors to the uncertainty in assessing the anthropogenic contribution in radiative forcing are the direct and indirect effects of aerosol particles on the Earth's radiative budget. Soot particles are of special interest since their properties can change significantly due to aging processes once they are emitted into the atmosphere. Probably the largest obstacle for the investigation of these processes in the laboratory is the long atmospheric lifetime of 1 week, requiring tailored experiments that cover this time span. This work presents results on the ability of two types of soot, obtained using a miniCAST soot generator, to act as cloud condensation nuclei (CCN) after exposure to atmospherically relevant levels of ozone (O3) and humidity. Aging times of up to 12 h were achieved by successful application of the continuous-flow stirred tank reactor (CSTR) concept while allowing for size selection of particles prior to the aging step. Particles of 100 nm diameter and rich in organic carbon (OC) that were initially CCN inactive showed significant CCN activity at supersaturations (SS) down to 0.3 % after 10 h of exposure to 200 ppb of O3. While this process was not affected by different levels of relative humidity in the range of 5 %-75 %, a high sensitivity towards the ambient/reaction temperature was observed. Soot particles with a lower OC content required an approximately 4-fold longer aging duration to show CCN activity at the same SS. Prior to the slow change in the CCN activity, a rapid increase in the particle diameter was detected which occurred within several minutes. This study highlights the applicability of the CSTR approach for the simulation of atmospheric aging processes, as aging durations beyond 12 h can be achieved in comparably small aerosol chamber volumes (< 3 m3). Implementation of our measurement results in a global aerosol-climate model, ECHAM6.3-HAM2.3, showed a statistically significant increase in the regional and global CCN burden and cloud droplet number concentration. © 2019 Author(s).
语种	英语
scopus关键词	aerosol composition; aerosol formation; cloud condensation nucleus; concentration (composition); ozone; soot; supersaturation
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/143955
作者单位	Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, 8092, Switzerland; Center of Excellence for Aerospace Particulate Emissions Reduction Research, Missouri University of Science and Technology, Rolla, MO 65401, United States; Metrology Research Centre, National Research Council Canada, Ottawa, ON K1A 0R6, Canada; Environmental and Health Protection Service, City of Zurich, Zurich, 8003, Switzerland
推荐引用方式 GB/T 7714	Friebel F.,Lobo P.,Neubauer D.,et al. Impact of isolated atmospheric aging processes on the cloud condensation nuclei activation of soot particles[J],2019,19(24).
APA	Friebel F..,Lobo P..,Neubauer D..,Lohmann U..,Van Dusseldorp S.D..,...&Mensah A.A..(2019).Impact of isolated atmospheric aging processes on the cloud condensation nuclei activation of soot particles.Atmospheric Chemistry and Physics,19(24).
MLA	Friebel F.,et al."Impact of isolated atmospheric aging processes on the cloud condensation nuclei activation of soot particles".Atmospheric Chemistry and Physics 19.24(2019).