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
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:Andreas Kürten, Chenxi Li, Federico Bianchi, Joachim Curtius, Antonio Dias, Neil McPherson Donahue, Jonathan Duplissy, Richard C. Flagan, Jani Hakala, Tuija Jokinen, Jasper Kirkby, Markku Kulmala, Ari Laaksonen, Katrianne Lehtipalo, Vladimir Makhmutov, Antti Onnela, Matti P. Rissanen, Mario Simon, Mikko Sipilä, Yuri Stozhkov, Jasmin Tröstl, Penglin Ye, Peter H. McMurry
URN:urn:nbn:de:hebis:30:3-356625
DOI:http://dx.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
Pagenumber: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
Dewey Decimal Classification:550 Geowissenschaften
Sammlungen:Universitätspublikationen
Open-Access-Publikationsfonds:Geowissenschaften / Geographie
Licence (German):License LogoCreative Commons - Namensnennung 4.0

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