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| Titel |
The role of low volatile organics on secondary organic aerosol formation |
| VerfasserIn |
H. Kokkola, P. Yli-Pirilä, M. Vesterinen, H. Korhonen, H. Keskinen, S. Romakkaniemi, L. Hao, A. Kortelainen, J. Joutsensaari, D. R. Worsnop, A. Virtanen, K. E. J. Lehtinen |
| 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 ; 14, no. 3 ; Nr. 14, no. 3 (2014-02-14), S.1689-1700 |
| Datensatznummer |
250118376
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| Publikation (Nr.) |
 copernicus.org/acp-14-1689-2014.pdf |
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| Zusammenfassung |
| Large-scale atmospheric models, which typically describe secondary organic
aerosol (SOA) formation based on chamber experiments, tend to systematically
underestimate observed organic aerosol burdens. Since SOA constitutes
a significant fraction of atmospheric aerosol, this discrepancy translates into an
underestimation of SOA contribution to radiative forcing of atmospheric
aerosol. Here we show that the
underestimation of SOA yields can be partly explained by wall losses of SOA
forming compounds during chamber experiments. We present a chamber experiment
where α-pinene and ozone are injected into a Teflon chamber. When these
two compounds react, we observe rapid formation and growth of new particles.
Theoretical analysis of this formation and growth event indicates rapid
formation of oxidized volatile organic compounds (OVOC) of very low volatility
in the
chamber. If these oxidized organic compounds form in the gas phase,
their wall losses will have significant implications on their
partitioning between the gas and particle phase. Although these OVOCs of very
low volatility contribute to the growth of new particles, their mass will almost
completely be depleted to the chamber walls during the experiment, while the
depletion of OVOCs of higher volatilities is less efficient. According to our
model simulations, the volatilities of OVOC contributing to the new particle
formation event can be of the order of 10−5 μg m−3. |
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