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| Titel |
Hygroscopic properties of the Paris urban aerosol in relation to its chemical composition |
| VerfasserIn |
K. A. Kamilli, L. Poulain, A. Held, A. Nowak, W. Birmili, A. Wiedensohler |
| 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. 2 ; Nr. 14, no. 2 (2014-01-22), S.737-749 |
| Datensatznummer |
250118302
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| Publikation (Nr.) |
 copernicus.org/acp-14-737-2014.pdf |
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| Zusammenfassung |
| Aerosol hygroscopic growth factors and chemical properties were measured as
part of the MEGAPOLI "Megacities Plume Case Study" at the urban site Laboratoire d'Hygiène de la Ville de Paris
(LHVP)
in the city center of Paris from June to August 2009, and from January to
February 2010. Descriptive hygroscopic growth factors (DGF) were derived in
the diameter range from 25 to 350 nm at relative humidities of 30, 55, 75,
and 90% by applying the summation method on humidified and dry aerosol
size distributions measured simultaneously with a humidified differential
mobility particle sizer (HDMPS) and a twin differential mobility particle
sizer (TDMPS). For 90% relative humidity, the DGF varied from 1.06 to
1.46 in summer, and from 1.06 to 1.66 in winter. Temporal variations in the
observed mean DGF could be well explained with a simple growth model based
on the aerosol chemical composition measured by aerosol mass spectrometry
(AMS) and black carbon photometry (MAAP). In particular, good agreement was
observed when sulfate was the predominant inorganic factor. A clear
overestimation of the predicted growth factor was found when the nitrate
mass concentration exceeded values of 10 μg m−3, e.g., during
winter. |
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