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| Titel |
Chemical characterisation of atmospheric aerosols during a 2007 summer field campaign at Brasschaat, Belgium: sources and source processes of biogenic secondary organic aerosol |
| VerfasserIn |
Y. Gómez-González, W. Wang, R. Vermeylen, X. Chi, J. Neirynck, I. A. Janssens, W. Maenhaut, M. Claeys |
| 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. 1 ; Nr. 12, no. 1 (2012-01-02), S.125-138 |
| Datensatznummer |
250010425
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| Publikation (Nr.) |
 copernicus.org/acp-12-125-2012.pdf |
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| Zusammenfassung |
| Measurements of organic marker compounds and inorganic species were
performed on PM2.5 aerosols from a Belgian forest site that is severely
impacted by urban pollution ("De Inslag", Brasschaat, Belgium) during a
2007 summer period within the framework of the "Formation mechanisms,
marker compounds, and source apportionment for biogenic atmospheric aerosols
(BIOSOL)" project. The measured organic species included (i) low-molecular
weight (MW) dicarboxylic acids (LMW DCAs), (ii) methanesulfonate (MSA),
(iii) terpenoic acids originating from the oxidation of α-pinene,
β-pinene, d-limonene and Δ3-carene, and (iv)
organosulfates related to secondary organic aerosol from the oxidation of
isoprene and α-pinene. The organic tracers explained, on average,
5.3 % of the organic carbon (OC), of which 0.7 % was due to MSA, 3.4 %
to LMW DCAs, 0.6 % to organosulfates, and 0.6 % to terpenoic acids. The
highest atmospheric concentrations of most species were observed during the
first five days of the campaign, which were characterised by maximum
day-time temperatures >22 °C. Most of the terpenoic acids and the
organosulfates peaked during day-time, consistent with their local
photochemical origin. High concentrations of
3-methyl-1,2,3-butanetricarboxylic acid (MBTCA) and low concentrations of
cis-pinonic acid were noted during the first five days of the campaign,
indicative of an aged biogenic aerosol. Several correlations between organic
species were very high (r>0.85), high (0.7<r<0.85), or substantial
(0.5<r<0.7), suggesting that they are generated through similar
formation pathways. Substantial correlations with temperature were found for
OC, water-soluble OC, MBTCA, and several other organic species. MBTCA and
terebic acid were highly correlated with the temperature (r>0.7) and
showed an Arrhenius-type relationship, consistent with their formation
through OH radical chemistry. |
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