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| Titel |
Acidic reaction products of monoterpenes and sesquiterpenes in atmospheric fine particles in a boreal forest |
| VerfasserIn |
M. Vestenius, H. Hellén, J. Levula, P. Kuronen, K. J. Helminen, T. Nieminen, M. Kulmala  , H. Hakola |
| 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. 15 ; Nr. 14, no. 15 (2014-08-08), S.7883-7893 |
| Datensatznummer |
250118930
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| Publikation (Nr.) |
 copernicus.org/acp-14-7883-2014.pdf |
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| Zusammenfassung |
Biogenic acids were measured in aerosols at the SMEAR II (Station for
Measuring Forest Ecosystem-Atmosphere Relations II) station in Finland from
June 2010 until October 2011. The analysed organic acids were pinic, pinonic,
caric, limonic and caryophyllinic acids from oxidation of α-pinene,
β-pinene, limonene, Δ3-carene and β-caryophyllene,
respectively. Due to a lack of authentic standards, the caric, limonic and
caryophyllinic acids were synthesised for this study. The mean, median, maximum and minimum
concentrations (ng m−3) were as follows: limonic acid (1.26, 0.80,
16.5, below detection limit (< LOD)), pinic acid (5.53, 3.25, 31.4, 0.15),
pinonic acid (9.87, 5.07, 80.1, < LOD), caric acid (5.52, 3.58, 49.8,
< LOD), and caryophyllinic acid (7.87, 6.07, 86.1, < LOD).
The highest terpenoic acid concentrations were measured during the summer.
Of the acids, β-caryophyllinic acid showed the highest concentrations
in summer, but during other times of the year pinonic acid was the most
abundant. The β-caryophyllinic acid contribution was higher than
expected, based on the emission calculations of the precursor compounds and
yields from oxidation experiments in smog chambers, implying that the
β-caryophyllene emissions or β-caryophyllinic acid yields were
underestimated. The concentration ratios between terpenoic acids and their
precursors were clearly lower in summer than in winter, indicating stronger
partitioning to the aerosol phase during the cold winter season. The
β-caryophyllinic and caric acids were weakly correlated with the
accumulation-mode particle number concentrations. |
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