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

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Kürten , A , Li , C , Bianchi , F , Curtius , J , Dias , A , Donahue , N M , Duplissy , J , Flagan , R C , Hakala , J , Jokinen , T , Kirkby , J , Kulmala , M , Laaksonen , A , Lehtipalo , K , Makhmutov , V , Onnela , A , Rissanen , M P , Simon , M , Sipilä , M , Stozhkov , Y , Tröstl , J , Ye , P & McMurry , P H 2018 , ' New particle formation in the sulfuric acid-dimethylamine-water system: reevaluation of CLOUD chamber measurements and comparison to an aerosol nucleation and growth model ' , Atmospheric Chemistry and Physics , vol. 18 , no. 2 , pp. 845-863 . https://doi.org/10.5194/acp-18-845-2018

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: Kürten, A.; Li, C.; Bianchi, F.; Curtius, J.; Dias, A.; Donahue, N. M.; Duplissy, J.; Flagan, R. C.; Hakala, J.; Jokinen, T.; Kirkby, J.; Kulmala, M.; Laaksonen, Ari; Lehtipalo, K.; Makhmutov, V.; Onnela, A.; Rissanen, M. P.; Simon, M.; Sipilä, M.; Stozhkov, Y.; Tröstl, J.; Ye, P.; McMurry, P. H.
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-01-23
Language: eng
Number of pages: 19
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/234486
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 (similar to 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 x 10(6) and 3 x 10(7) cm(-3), and dimethylamine mixing ratio of similar to 40 pptv, i.e., 1 x 10(9) cm(-3)).
Subject: 114 Physical sciences
IONIZATION MASS-SPECTROMETER
ION-INDUCED NUCLEATION
CI-API-TOF
CHEMICAL-IONIZATION
ATMOSPHERIC PARTICLES
ELECTRICAL MOBILITY
OXIDATION-PRODUCTS
FORMATION RATES
BOUNDARY-LAYER
FREE-ENERGIES
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