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| Titel |
SO₂ oxidation products other than H₂SO₄ as a trigger of new particle formation. Part 2: Comparison of ambient and laboratory measurements, and atmospheric implications |
| VerfasserIn |
A. Laaksonen, M. Kulmala  , T. Berndt, F. Stratmann, S. Mikkonen, A. Ruuskanen, K. E. J. Lehtinen, M. Maso, P. Aalto, T. Petäjä, I. Riipinen, S.-L. Sihto, R. Janson, F. Arnold, M. Hanke, J. Ücker, B. Umann, K. Sellegri, C. D. O'Dowd, 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. 23 ; Nr. 8, no. 23 (2008-12-10), S.7255-7264 |
| Datensatznummer |
250006494
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| Publikation (Nr.) |
 copernicus.org/acp-8-7255-2008.pdf |
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| Zusammenfassung |
| Atmospheric new particle formation is generally thought to occur due to
homogeneous or ion-induced nucleation of sulphuric acid. We compare ambient
nucleation rates with laboratory data from nucleation experiments involving
either sulphuric acid or oxidized SO2. Atmospheric nucleation occurs at
H2SO4 concentrations 2–4 orders of magnitude lower than binary or
ternary nucleation rates of H2SO4 produced from a liquid
reservoir, and atmospheric H2SO4 concentrations are very well
replicated in the SO2 oxidation experiments. We hypothesize these
features to be due to the formation of free HSO5 radicals in pace with
H2SO4 during the SO2 oxidation. We suggest that at
temperatures above ~250 K these radicals produce nuclei of new
aerosols much more efficiently than H2SO4. These nuclei are
activated to further growth by H2SO4 and possibly other trace
species. However, at lower temperatures the atmospheric relative acidity is
high enough for the H2SO4–H2O nucleation to dominate. |
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