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| Titel |
Characterization of aerosol and cloud water at a mountain site during WACS 2010: secondary organic aerosol formation through oxidative cloud processing |
| VerfasserIn |
A. K. Y. Lee, K. L. Hayden, P. Herckes, W. R. Leaitch, J. Liggio, A. M. Macdonald, J. P. D. Abbatt |
| 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 ; 12, no. 15 ; Nr. 12, no. 15 (2012-08-06), S.7103-7116 |
| Datensatznummer |
250011373
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| Publikation (Nr.) |
 copernicus.org/acp-12-7103-2012.pdf |
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| Zusammenfassung |
| The water-soluble fractions of aerosol filter samples and cloud water
collected during the Whistler Aerosol and Cloud Study (WACS 2010) were
analyzed using an Aerodyne aerosol mass spectrometer (AMS). This is the
first study to report AMS organic spectra of re-aerosolized cloud water, and
to make direct comparison between the AMS spectra of cloud water and aerosol
samples collected at the same location. In general, the mass spectra of
aerosol were very similar to those of less volatile cloud organics. By using
a photochemical reactor to oxidize both aerosol filter extracts and cloud
water, we find evidence that fragmentation of water-soluble organics in
aerosol increases their volatility during photochemical oxidation. By
contrast, enhancement of AMS-measurable organic mass by up to 30% was
observed during the initial stage of oxidation of cloud water organics,
which was followed by a decline at the later stages of oxidation. These
observations are in support of the general hypothesis that cloud water
oxidation is a viable route for SOA formation. In particular, we propose
that additional SOA material was produced by functionalizing dissolved
organics via OH oxidation, where these dissolved organics are sufficiently
volatile that they are not usually part of the aerosol. This work
demonstrates that water-soluble organic compounds of intermediate volatility
(IVOC), such as cis-pinonic acid, produced via gas-phase oxidation of
monoterpenes, can be important aqueous-phase SOA precursors in a
biogenic-rich environment. |
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