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| Titel |
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours |
| VerfasserIn |
T. Petäjä, V.-M. Kerminen, K. Hämeri, P. Vaattovaara, J. Joutsensaari, W. Junkermann, A. Laaksonen, 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 ; 5, no. 3 ; Nr. 5, no. 3 (2005-03-10), S.767-779 |
| Datensatznummer |
250002506
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| Publikation (Nr.) |
 copernicus.org/acp-5-767-2005.pdf |
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| Zusammenfassung |
| Hygroscopicity (i.e. water vapour affinity) of atmospheric aerosol
particles is one of the key factors in defining their impacts on
climate. Condensation of sulphuric acid onto less hygroscopic
particles is expected to increase their hygrocopicity and hence their
cloud condensation nuclei formation potential. In this study,
differences in the hygroscopic and ethanol uptake properties of
ultrafine aerosol particles in the Arctic air masses with a different
exposure to anthropogenic sulfur pollution were examined. The main
discovery was that Aitken mode particles having been exposed to
polluted air were more hygroscopic and less soluble to ethanol than
after transport in clean air. This aging process was attributed to
sulphur dioxide oxidation and subsequent condensation during the
transport of these particle to our measurement site. The
hygroscopicity of nucleation mode aerosol particles, on the other
hand, was approximately the same in all the cases, being indicative of
a relatively similar chemical composition despite the differences in
air mass transport routes. These particles had also been produced
closer to the observation site typically 3–8 h prior to
sampling. Apparently, these particles did not have an opportunity to
accumulate sulphuric acid on their way to the site, but instead their
chemical composition (hygroscopicity and ethanol solubility) resembled
that of particles produced in the local or semi-regional ambient
conditions. |
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