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New particle formation in the sulfuric acid–dimethylamine–water system : reevaluation of CLOUD chamber measurements and comparison to an aerosol nucleation and growth model

  • A recent CLOUD (Cosmics Leaving OUtdoor Droplets) chamber study showed that sulfuric acid and dimethylamine produce new aerosols very efficiently and yield particle formation rates that are compatible with boundary layer observations. These previously published new particle formation (NPF) rates are reanalyzed in the present study with an advanced method. The results show that the NPF rates at 1.7 nm are more than a factor of 10 faster than previously published due to earlier approximations in correcting particle measurements made at a larger detection threshold. The revised NPF rates agree almost perfectly with calculated rates from a kinetic aerosol model at different sizes (1.7 and 4.3 nm mobility diameter). In addition, modeled and measured size distributions show good agreement over a wide range of sizes (up to ca. 30 nm). Furthermore, the aerosol model is modified such that evaporation rates for some clusters can be taken into account; these evaporation rates were previously published from a flow tube study. Using this model, the findings from the present study and the flow tube experiment can be brought into good agreement for the high base-to-acid ratios (∼ 100) relevant for this study. This confirms that nucleation proceeds at rates that are compatible with collision-controlled (a.k.a. kinetically controlled) NPF for the conditions during the CLOUD7 experiment (278 K, 38 % relative humidity, sulfuric acid concentration between 1  ×  106 and 3  ×  107 cm−3, and dimethylamine mixing ratio of ∼  40 pptv, i.e., 1  ×  109 cm−3).

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Author:Christoph Andreas KürtenORCiDGND, Chenxi Li, Federico BianchiORCiDGND, Joachim CurtiusORCiD, Antonio Dias, Neil McPherson DonahueORCiDGND, Jonathan DuplissyORCiD, Richard C. FlaganORCiD, Jani Hakala, Tuija Jokinen, Jasper KirkbyORCiD, Markku KulmalaORCiDGND, Ari Laaksonen, Katrianne LehtipaloORCiDGND, Vladimir MakhmutovORCiD, Antti OnnelaORCiD, Matti P. RissanenORCiD, Mario SimonORCiD, Mikko SipiläORCiD, Yuri Stozhkov, Jasmin Tröstl, Penglin Ye, Peter H. McMurry
URN:urn:nbn:de:hebis:30:3-356625
DOI:https://doi.org/10.5194/acp-18-845-2018
ISSN:1680-7324
Parent Title (English):Atmospheric chemistry and physics
Publisher:EGU
Place of publication:Katlenburg-Lindau
Contributor(s):Farahnaz Khosrawi
Document Type:Article
Language:English
Year of Completion:2018
Date of first Publication:2018/01/23
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2018/05/17
Volume:18
Issue:2
Page Number:19
First Page:845
Last Page:863
Note:
© Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.
HeBIS-PPN:433880929
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Sammlungen:Universitätspublikationen
Open-Access-Publikationsfonds:Geowissenschaften / Geographie
Licence (German):License LogoCreative Commons - Namensnennung 4.0