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| Titel |
Evolution of particle composition in CLOUD nucleation experiments |
| VerfasserIn |
H. Keskinen, A. Virtanen, J. Joutsensaari, G. Tsagkogeorgas, J. Duplissy, S. Schobesberger, M. Gysel, F. Riccobono, J. G. Slowik, F. Bianchi, T. Yli-Juuti, K. Lehtipalo, L. Rondo, M. Breitenlechner, A. Kupc, J. Almeida, A. Amorim, E. M. Dunne, A. J. Downard, S. Ehrhart, A. Franchin, M. K. Kajos, J. Kirkby, A. Kürten, T. Nieminen, V. Makhmutov, S. Mathot, P. Miettinen, A. Onnela, T. Petäjä, A. Praplan, F. D. Santos, S. Schallhart, M. Sipilä, Y. Stozhkov, A. Tomé, P. Vaattovaara, D. Wimmer, A. Prevot, J. Dommen, N. M. Donahue, R. C. Flagan, E. Weingärtner, Y. Viisanen, I. Riipinen, A. Hansel, J. Curtius, M. Kulmala  , D. R. Worsnop, U. Baltensperger, H. Wex, F. Stratmann, A. Laaksonen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 11 ; Nr. 13, no. 11 (2013-06-06), S.5587-5600 |
| Datensatznummer |
250018690
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| Publikation (Nr.) |
 copernicus.org/acp-13-5587-2013.pdf |
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| Zusammenfassung |
| Sulphuric acid, ammonia, amines, and oxidised organics play a crucial role in
nanoparticle formation in the atmosphere. In this study, we investigate the
composition of nucleated nanoparticles formed from these compounds in the
CLOUD (Cosmics Leaving Outdoor Droplets) chamber experiments at CERN (Centre
européen pour la recherche nucléaire). The investigation was carried
out via analysis of the particle hygroscopicity, ethanol affinity, oxidation
state, and ion composition. Hygroscopicity was studied by a hygroscopic
tandem differential mobility analyser and a cloud condensation nuclei
counter, ethanol affinity by an organic differential mobility analyser and
particle oxidation level by a high-resolution time-of-flight aerosol mass
spectrometer. The ion composition was studied by an atmospheric pressure
interface time-of-flight mass spectrometer. The volume fraction of the
organics in the particles during their growth from sizes of a few nanometers
to tens of nanometers was derived from measured hygroscopicity assuming the
Zdanovskii–Stokes–Robinson relationship, and compared to values gained from
the spectrometers. The ZSR-relationship was also applied to obtain the
measured ethanol affinities during the particle growth, which were used to
derive the volume fractions of sulphuric acid and the other inorganics (e.g.
ammonium salts). In the presence of sulphuric acid and ammonia, particles
with a mobility diameter of 150 nm were chemically neutralised to ammonium
sulphate. In the presence of oxidation products of pinanediol, the organic
volume fraction of freshly nucleated particles increased from 0.4 to
~0.9, with an increase in diameter from 2 to 63 nm. Conversely, the
sulphuric acid volume fraction decreased from 0.6 to 0.1 when the particle
diameter increased from 2 to 50 nm. The results provide information on the
composition of nucleated aerosol particles during their growth in the
presence of various combinations of sulphuric acid, ammonia, dimethylamine
and organic oxidation products. |
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