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| Titel |
Measurements of organic gases during aerosol formation events in the boreal forest atmosphere during QUEST |
| VerfasserIn |
K. Sellegri, M. Hanke, B. Umann, F. Arnold, 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. 2 ; Nr. 5, no. 2 (2005-02-08), S.373-384 |
| Datensatznummer |
250002348
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| Publikation (Nr.) |
 copernicus.org/acp-5-373-2005.pdf |
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| Zusammenfassung |
| Biogenic VOCs are important in the growth and possibly also in the early
stages of formation of atmospheric aerosol particles. In this work, we
present 10 min-time resolution measurements of organic trace gases at
Hyytiälä, Finland during March 2002. The measurements were part of
the project QUEST (Quantification of Aerosol Nucleation in the European
Boundary Layer) and took place during a two-week period when nucleation
events occurred with various intensities nearly every day. Using a
ground-based Chemical Ionization Mass Spectrometer (CIMS) instrument, the
following trace gases were detected: acetone, TMA, DMA, mass 68amu
(candidate=isoprene), monoterpenes, methyl vinyl ketone (MVK) and
methacrolein (MaCR) and monoterpene oxidation products (MTOP). For all of
them except for the amines, we present daily variations during different
classes of nucleation events, and non-event days. BVOC oxidation products
(MVK, MaCR and MTOP) show a higher ratio to the CS on event days compared to
non-event days, indicating that their abundance relative to the surface of
aerosol available is higher on nucleation days. Moreover, BVOC oxidation
products are found to show significant correlations with the condensational
sink (CS) on nucleation event days, which indicates that they are
representative of less volatile organic compounds that contribute to the
growth of the nucleated particles and generally secondary organic aerosol
formation. Behaviors of BVOC on event and non event days are compared to the
behavior of CO. |
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