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| Titel |
The role of VOC oxidation products in continental new particle formation |
| VerfasserIn |
A. Laaksonen, M. Kulmala  , C. D. O'Dowd, J. Joutsensaari, P. Vaattovaara, S. Mikkonen, K. E. J. Lehtinen, L. Sogacheva, M. Maso, P. Aalto, T. Petäjä, A. Sogachev, Y. J. Yoon, H. Lihavainen, D. Nilsson, M. C. Facchini, F. Cavalli, S. Fuzzi, T. Hoffmann, F. Arnold, M. Hanke, K. Sellegri, B. Umann, W. Junkermann, H. Coe, J. D. Allan, M. R. Alfarra, D. R. Worsnop, M.-L. Riekkola, T. Hyötyläinen, Y. Viisanen |
| 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 ; 8, no. 10 ; Nr. 8, no. 10 (2008-05-20), S.2657-2665 |
| Datensatznummer |
250006143
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| Publikation (Nr.) |
 copernicus.org/acp-8-2657-2008.pdf |
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| Zusammenfassung |
| Aerosol physical and chemical properties and trace gas concentrations were
measured during the QUEST field campaign in March–April 2003, in
Hyytiälä, Finland. Our aim was to understand the role of oxidation
products of VOC's such as mono- and sesquiterpenes in atmospheric nucleation
events. Particle chemical compositions were measured using the Aerodyne
Aerosol Mass Spectrometer, and chemical compositions of aerosol samples
collected with low-pressure impactors and a high volume sampler were
analysed using a number of techniques. The results indicate that during and
after new particle formation, all particles larger than 50 nm in diameter
contained similar organic substances that are likely to be mono- and
sesquiterpene oxidation products. The oxidation products identified in the
high volume samples were shown to be mostly aldehydes. In order to study the
composition of particles in the 10–50 nm range, we made use of Tandem
Differential Mobility Analyzer results. We found that during nucleation
events, both 10 and 50 nm particle growth factors due to uptake of ethanol
vapour correlate strongly with gas-phase monoterpene oxidation product
(MTOP) concentrations, indicating that the organic constituents of particles
smaller than 50 nm in diameter are at least partly similar to those of
larger particles. We furthermore showed that particle growth rates during
the nucleation events are correlated with the gas-phase MTOP concentrations.
This indicates that VOC oxidation products may have a key role in
determining the spatial and temporal features of the nucleation events. This
conclusion was supported by our aircraft measurements of new 3–10 nm
particle concentrations, which showed that the nucleation event on 28 March 2003, started at the ground layer, i.e. near the VOC source, and evolved
together with the mixed layer. Furthermore, no new particle formation was
detected upwind away from the forest, above the frozen Gulf of Bothnia. |
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