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Title	New particle formation in the sulfuric acid–dimethylamine–water system: reevaluation of CLOUD chamber measurements and comparison to an aerosol nucleation and growth model
Related title	New particle formation in the sulfuric acid–dimethylamine–water system: reevaluation of CLOUD chamber measurements and comparison to an aerosol nucleation and growth model
Author(s)	Kürten, Andreas (Goethe U., Frankfurt (main)) ; Li, Chenxi (Minnesota U.) ; Bianchi, Federico (U. Helsinki (main)) ; Curtius, Joachim (Goethe U., Frankfurt (main)) ; Dias, António (U. Lisbon (main)) ; Donahue, Neil M (Carnegie Mellon U. (main)) ; Duplissy, Jonathan (U. Helsinki (main)) ; Flagan, Richard C (Caltech) ; Hakala, Jani (U. Helsinki (main)) ; Jokinen, Tuija (U. Helsinki (main)) ; Kirkby, Jasper (CERN ; Goethe U., Frankfurt (main)) ; Kulmala, Markku (U. Helsinki (main)) ; Laaksonen, Ari (Finnish Meteorological Inst.) ; Lehtipalo, Katrianne (U. Helsinki (main) ; PSI, Villigen) ; Makhmutov, Vladimir (LPI, Moscow (main)) ; Onnela, Antti (CERN) ; Rissanen, Matti P (U. Helsinki (main)) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Sipilä, Mikko (U. Helsinki (main)) ; Stozhkov, Yuri (LPI, Moscow (main)) ; Tröstl, Jasmin (PSI, Villigen) ; Ye, Penglin (Carnegie Mellon U. (main) ; Aerodyne Research, Billerica) ; McMurry, Peter H (U. Minnesota, Minneapolis (main))
Publication	2018
Number of pages	19
In:	Atmos. Chem. Phys. 18 (2018) 845-863
DOI	10.5194/acp-18-845-2018
Subject category	Physics in General
Accelerator/Facility, Experiment	CLOUD
Abstract	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 $1  \times  10^{6}$ and $3  \times  10^{7}$ cm$^{−3}$, and dimethylamine mixing ratio of ∼  40 pptv, i.e., $1  \times  10^{9}$ cm$^{−3}$).
Copyright/License	CC-BY-4.0

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