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| Titel |
On the abundance and source contributions of dicarboxylic acids in size-resolved aerosol particles at continental sites in central Europe |
| VerfasserIn |
D. van Pinxteren, C. Neusüß, H. Herrmann |
| 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. 8 ; Nr. 14, no. 8 (2014-04-17), S.3913-3928 |
| Datensatznummer |
250118625
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| Publikation (Nr.) |
 copernicus.org/acp-14-3913-2014.pdf |
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| Zusammenfassung |
| Dicarboxylic acids (DCAs) are among the most abundant organic compounds
observed in atmospheric aerosol particles and have been extensively studied
at many places around the world. The importance of the various primary
sources and secondary formation pathways discussed in the literature is
often difficult to assess from field studies, though. In the present study,
a large data set of size-resolved DCA concentrations from several inland
sites in Germany is combined with results from a recently developed approach
of statistical back-trajectory analysis and additional data. Principal
component analysis is then used to reveal the most important factors
governing the abundance of DCAs in different particle size ranges. The two
most important sources revealed are (i) photochemical formation during
intense radiation days in polluted air masses, likely occurring in the gas
phase on short timescales (gasSOA), and (ii) secondary reactions in
anthropogenically influenced air masses, likely occurring in the aqueous
phase on longer timescales (aqSOA). While the first source strongly impacts
DCA concentrations mainly in small and large particles, the second one
enhances accumulation mode DCAs and is responsible for the bulk of the
observed concentrations. Primary sources were found to be minor (sea salt,
soil resuspension) or non-existent (biomass burning, traffic). The results
can be regarded as representative for typical central European continental
conditions. |
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