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| Titel |
Seasonal variations of concentrations and optical properties of water soluble HULIS collected in urban environments |
| VerfasserIn |
C. Baduel, D. Voisin, J.-L. Jaffrezo |
| 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 ; 10, no. 9 ; Nr. 10, no. 9 (2010-05-03), S.4085-4095 |
| Datensatznummer |
250008416
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| Publikation (Nr.) |
 copernicus.org/acp-10-4085-2010.pdf |
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| Zusammenfassung |
| Major contributors to the organic aerosol include water-soluble
macromolecular compounds (e.g. HULISWS: Water Soluble Humic LIke
Substances). The nature and sources of HULISWS are still largely
unknown. This work is based on a monitoring in six different French cities
performed during summer and winter seasons. HULISWS analysis was
performed with a selective method of extraction complemented by carbon
quantification. UV spectroscopy was also applied for their chemical
characterisation. HULISWS carbon represent an important contribution to
the organic aerosol mass in summer and winter, as it accounts for 12–22%
of Organic Carbon and 34–40% of Water Soluble Organic Carbon. We found
strong differences in the optical properties (specific absorbance at 250,
272, 280 nm and E2/E3 ratio) and therefore in the chemical structure between
HULISWS from samples of summer- and wintertime. These differences
highlight different processes responsible for emissions and formation of
HULISWS according to the season, namely biomass burning in winter, and
secondary processes in summer. Specific absorbance can also be considered as
a rapid and useful indicator of the origin of HULISWS in urban
environment. |
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