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| Titel |
Bounce behavior of freshly nucleated biogenic secondary organic aerosol particles |
| VerfasserIn |
A. Virtanen, J. Kannosto, H. Kuuluvainen, A. Arffman, J. Joutsensaari, E. Saukko, L. Hao, P. Yli-Pirilä, P. Tiitta, J. K. Holopainen, J. Keskinen, D. R. Worsnop, J. N. Smith, A. Laaksonen |
| 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. 16 ; Nr. 11, no. 16 (2011-08-29), S.8759-8766 |
| Datensatznummer |
250010034
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| Publikation (Nr.) |
 copernicus.org/acp-11-8759-2011.pdf |
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| Zusammenfassung |
| The assessment of the climatic impacts and adverse health effects of
atmospheric aerosol particles requires detailed information on particle
properties. However, very limited information is available on the morphology
and phase state of secondary organic aerosol (SOA) particles. The physical
state of particles greatly affects particulate-phase chemical reactions, and
thus the growth rates of newly formed atmospheric aerosol. Thus verifying
the physical phase state of SOA particles gives new and important insight
into their formation, subsequent growth, and consequently potential
atmospheric impacts. According to our recent study, biogenic SOA particles
produced in laboratory chambers from the oxidation of real plant emissions
as well as in ambient boreal forest atmospheres can exist in a solid phase
in size range >30 nm. In this paper, we extend previously published
results to diameters in the range of 17–30 nm. The physical phase of the
particles is studied by investigating particle bounce properties utilizing
electrical low pressure impactor (ELPI). We also investigate the effect of
estimates of particle density on the interpretation of our bounce
observations. According to the results presented in this paper, particle
bounce clearly decreases with decreasing particle size in sub 30 nm size
range. The comparison measurements by ammonium sulphate and investigation of
the particle impaction velocities strongly suggest that the decreasing
bounce is caused by the differences in composition and phase of large
(diameters greater than 30 nm) and smaller (diameters between 17 and 30 nm)
particles. |
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