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| Titel |
Organic condensation: a vital link connecting aerosol formation to cloud condensation nuclei (CCN) concentrations |
| VerfasserIn |
I. Riipinen, J. R. Pierce, T. Yli-Juuti, T. Nieminen, S. Häkkinen, M. Ehn, H. Junninen, K. Lehtipalo, T. Petäjä, J. Slowik, R. Chang, N. C. Shantz, J. Abbatt, W. R. Leaitch, V.-M. Kerminen, D. R. Worsnop, S. N. Pandis, N. M. Donahue, M. Kulmala  |
| 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 ; 11, no. 8 ; Nr. 11, no. 8 (2011-04-27), S.3865-3878 |
| Datensatznummer |
250009655
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| Publikation (Nr.) |
 copernicus.org/acp-11-3865-2011.pdf |
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| Zusammenfassung |
| Atmospheric aerosol particles influence global climate as well as impair air
quality through their effects on atmospheric visibility and human health.
Ultrafine (<100 nm) particles often dominate aerosol numbers, and
nucleation of atmospheric vapors is an important source of these particles.
To have climatic relevance, however, the freshly nucleated particles need to
grow in size. We combine observations from two continental sites (Egbert,
Canada and Hyytiälä, Finland) to show that condensation of organic
vapors is a crucial factor governing the lifetimes and climatic importance
of the smallest atmospheric particles. We model the observed ultrafine
aerosol growth with a simplified scheme approximating the condensing species
as a mixture of effectively non-volatile and semi-volatile species,
demonstrate that state-of-the-art organic gas-particle partitioning models
fail to reproduce the observations, and propose a modeling approach that is
consistent with the measurements. We find that roughly half of the mass of
the condensing mass needs to be distributed proportional to the aerosol
surface area (thus implying that the condensation is governed by gas-phase
concentration rather than the equilibrium vapour pressure) to explain the
observed aerosol growth. We demonstrate the large sensitivity of predicted
number concentrations of cloud condensation nuclei (CCN) to these
interactions between organic vapors and the smallest atmospheric
nanoparticles – highlighting the need for representing this process in
global climate models. |
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