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. Discussions
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 re-analyzed 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 larger detection threshold. The revised NPF rates agree almost perfectly with calculated rates from a kinetic aerosol model at different sizes (1.7 nm and 4.3 nm mobility diameter). In addition, modeled and measured size distributions show good agreement over a wide range (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. This confirms that nucleation proceeds at rates that are compatible with collision-controlled (a.k.a. kinetically-controlled) new particle formation for the conditions during the CLOUD7 experiment (278 K, 38% RH, sulfuric acid concentration between 1×106 and 3×107 cm-3 and dimethylamine mixing ratio of ~40 pptv). Finally, the simulation of atmospheric new particle formation reveals that even tiny mixing ratios of dimethylamine (0.1 pptv) yield NPF rates that could explain significant boundary layer particle formation. This highlights the need for improved speciation and quantification techniques for atmospheric gas-phase amine measurements.
Y1  - 2017
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/46485
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-464850
SN  - 1680-7375
SN  - 1680-7367
N1  - © Author(s) 2017. CC BY 4.0 License
VL  - 17
SP  - 1
EP  - 31
PB  - EGU
CY  - Katlenburg-Lindau
ER  -