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| Titel |
Polycyclic aromatic hydrocarbons (PAHs) in the atmospheres of two French alpine valleys: sources and temporal patterns |
| VerfasserIn |
N. Marchand, J. L. Besombes, N. Chevron, P. Masclet, G. Aymoz, 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 ; 4, no. 5 ; Nr. 4, no. 5 (2004-08-02), S.1167-1181 |
| Datensatznummer |
250001932
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| Publikation (Nr.) |
 copernicus.org/acp-4-1167-2004.pdf |
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| Zusammenfassung |
| Alpine valleys represent some of the most important crossroads for
international heavy-duty traffic in Europe, but the full impact of this
traffic on air quality is not known due to a lack of data concerning these
complex systems. As part of the program "Pollution des Vallées
Alpines" (POVA), we performed two sampling surveys of polycyclic aromatic
hydrocarbons (PAHs) in two sensitive valleys: the Chamonix and Maurienne
Valleys, between France and Italy. Sampling campaigns were performed during
the summer of 2000 and the winter of 2001, with both periods taking place
during the closure of the "Tunnel du Mont-Blanc". The first objective of
this paper is to describe the relations between PAH concentrations, external
parameters (sampling site localization, meteorological parameters, sources),
and aerosol characteristics, including its carbonaceous fraction (OC and
EC). The second objective is to study the capacity of PAH profiles to
accurately distinguish the different emission sources. Temporal evolution of
the relative concentration of an individual PAH (CHR) and the PAH groups
BghiP+COR and BbF+BkF is studied in order to differentiate wood combustion,
gasoline, and diesel emissions, respectively. The results show that the
total particulate PAH concentrations were higher in the Chamonix valley
during both seasons, despite the cessation of international traffic.
Seasonal cycles, with higher concentrations in winter, are also stronger in
this valley. During winter, particulate PAH concentration can reach very
high levels (up to 155 ng.m-3) in this valley during cold anticyclonic
periods. The examination of sources shows the impact during summer of
heavy-duty traffic in the Maurienne valley and of gasoline vehicles in the
Chamonix valley. During winter, Chamonix is characterized by the strong
influence of wood combustion in residential fireplaces, even if the temporal
evolution of specific PAH ratios are difficult to interpret. Information on
sources given by PAH profiles can only be considered in qualitative terms. |
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