TY  - JOUR
A1  - Kürten, Christoph Andreas
A1  - Li, Chenxi
A1  - Bianchi, Federico
A1  - Curtius, Joachim
A1  - Dias, Antonio
A1  - Donahue, Neil McPherson
A1  - Duplissy, Jonathan
A1  - Flagan, Richard C.
A1  - Hakala, Jani
A1  - Jokinen, Tuija
A1  - Kirkby, Jasper
A1  - Kulmala, Markku
A1  - Laaksonen, Ari
A1  - Lehtipalo, Katrianne
A1  - Makhmutov, Vladimir
A1  - Onnela, Antti
A1  - Rissanen, Matti P.
A1  - Simon, Mario
A1  - Sipilä, Mikko
A1  - Stozhkov, Yuri
A1  - Tröstl, Jasmin
A1  - Ye, Penglin
A1  - McMurry, Peter H.
T1  - New particle formation in the sulfuric acid–dimethylamine–water system : reevaluation of CLOUD chamber measurements and comparison to an aerosol nucleation and growth model
T2  - Atmospheric chemistry and physics
N2  - 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).
Y1  - 2018
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/35662
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-356625
SN  - 1680-7324
N1  - © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.
VL  - 18
IS  - 2
SP  - 845
EP  - 863
PB  - EGU
CY  - Katlenburg-Lindau
ER  -