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| Titel |
Modelling the formation of organic particles in the atmosphere |
| VerfasserIn |
T. Anttila, V.-M. Kerminen, M. Kulmala  , A. Laaksonen, C. D. O'Dowd |
| 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 ; 4, no. 4 ; Nr. 4, no. 4 (2004-07-06), S.1071-1083 |
| Datensatznummer |
250001839
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| Publikation (Nr.) |
 copernicus.org/acp-4-1071-2004.pdf |
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| Zusammenfassung |
| Particle formation resulting from activation of inorganic
stable clusters by a supersaturated organic vapour was investigated using a
numerical model. The applied aerosol dynamic model included a detailed
description of the activation process along with a treatment of the
appropriate aerosol and gas-phase processes. The obtained results suggest
that both gaseous sulphuric acid and organic vapours contribute to organic
particle formation in continental background areas. The initial growth of
freshly-nucleated clusters is driven mainly by condensation of gaseous
sulphuric acid and by a lesser extent self-coagulation. After the clusters
have reached sizes of around 2 nm in diameter, low-volatile organic vapours
start to condense spontaneously into the clusters, thereby accelerating
their growth to detectable sizes. A shortage of gaseous sulphuric acid or
organic vapours limit, or suppress altogether, the particle formation, since
freshly-nucleated clusters are rapidly coagulated away by pre-existing
particles. The obtained modelling results were applied to explaining the
observed seasonal cycle in the number of aerosol formation events in a
continental forest site. |
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