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Communication incl. Poster: BibTeX citation key:  Flamentb
Flament, P., Deboudt, K., Aimoz, L., Cachier, H., Chatenet, B. & Weis, D. 2008. Chemical composition of tropospheric particulate matter in West Africa: Natural and pollution source assessment. Work presented at Goldschmidt Conference 2008, July 13—18.
Last Edited by: Deleted user 2008-09-30 12:55:33
 B  
Categories: Aerosol and Chemistry
Keywords: Aerosol, Chemistry
Creators: Aimoz, Cachier, Chatenet, Deboudt, Flament, Weis
Collection: Goldschmidt Conference 2008

Peer reviewed
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Abstract
West African troposphere is periodically perturbed by Saharan dust events, occurring mainly during the dry season (November to April). Saharan dust events are able to transport natural aerosols over long distances [1]. These typical events are sporadic but intense. Nevertheless, in an overall description of the air quality in the Sahelian zone, other sources (biomass burning emissions, traffic, …) have to be considered. To complete the characterization of these dust events, the chemical composition of tropospheric Particulate Matter (PM) is presented here. Sampling campaigns (PM 10) were performed in Jan.-Feb. 2006 in the vicinity of M’Bour, Senegal, a coastal city of 100,000 inhabitants. Chemical analyses have been performed for carbon (total, organic and water-soluble fractions), major elements (Al, Si, Fe, Ca, Na, Mg, K), trace metals (Pb, Zn), and major ions (SO42-, Cl-, PO43-, NO3-, Na+, K+, NH4+, Mg+, Ca+).
The absence of any significant dust event is conclusively proven by the low Al content in PM 10 ([Al] < 10 µg.m-3). Organic carbon, possibly from biomass, represents a considerable proportion of collected carbonaceous PM (67 to 92 wt.%). High Pb and Zn contents (mostly > 100 ng.m-3) indicate possible pollution episodes. However, the black carbon content (0.36 to 2.69 µg.m-3), is not typical of polluted areas [2]. Our results seem to indicate the variable PM sources: the remote Saharan dust emissions, the local anthropogenic emissions and biomass burning. Current investigations concern the assessment of the biomass burning sources regulating the organic content of PM 10.
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Last Edited by: Deleted user