PuSH - Publication Server of Helmholtz Zentrum München: Daytime resolved analysis of polycyclic aromatic hydrocarbons in urban aerosol samples - impact of sources and meterological conditions.

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Sklorz, M. ; Schnelle-Kreis, J. ; Liu, Y.* ; Orasche, J.* ; Zimmermann, R.

Daytime resolved analysis of polycyclic aromatic hydrocarbons in urban aerosol samples - impact of sources and meterological conditions.

In: Proceedings (7th International Aerosol Conference, 10-15 September 2006, St. Paul, Minnesota, USA). Kidlington, Oxford: Elsevier, 2006. 1712-1713 (Chemosphere ; 67)

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Urban aerosol was collected in a summer and a winter campaign for 7 and 3 days, respectively. Low volume samples were taken with a time resolution of 160 min using a filter/sorption cartridge system extended by an ozone scrubber. Concentrations of mainly particle associated polycyclic aromatic hydrocarbons (PAH) and oxidised PAH (O-PAH) were determined by gas chromatography/high resolution mass spectrometry. The sampling site was located in the city centre of Augsburg, Germany, near major roads with high traffic volume. The daily concentrations and profiles were mainly governed by local emissions from traffic and domestic heating, as well as by the meteorological conditions. During the winter campaign, concentrations were more than 10 fold higher than during the summer campaign. Highest concentrations were found concurrent with low boundary layer heights and low wind speeds. Significant diurnal variation of the PAH profiles was observed. Enhanced influences of traffic related PAH on the PAH profiles were evident during daytime in summer, whereas emissions from hot water generation and domestic heating were obvious during the night time of both seasons. A general idea about the global meteorological situation was acquired using back trajectory calculations (NOAA ARL HYSPLIT4). Due to high local emissions in combination with low air exchange during the two sampling campaigns, effects of mesoscale transport were not clearly observable. © 2006 Elsevier Ltd. All rights reserved.

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