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Communication incl. Poster: BibTeX citation key:  Adon
Adon, M., Galy-Lacaux, C., Delon, C., Yoboué, V., Liousse, C., Lacaux, J.-P., Pienaar, K., Al Ourabi, H., Dungal, L., Diop, B., Sigha-Nkamdjou, L., Akpo, A. & Lavenu, F. 2009. Long term measurements of nitrogen dioxide, ammonia, nitric acid and ozone in Africa using passive samplers. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-19 17:44:30
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Categories: Aerosol and Chemistry, Atmospheric processes, Environment and Climate Monitoring
Keywords: Chemistry, Interannual variability, Intraseasonal variability
Creators: Adon, Akpo, Al Ourabi, Delon, Diop, Dungal, Galy-Lacaux, Lacaux, Lavenu, Liousse, Pienaar, Sigha-Nkamdjou, Yoboué
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Popularity index:  71.2%
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Abstract
The IDAF measuring network belongs to the atmospheric chemistry international network DEBITS/IGAC. DEBITS, component of the IGAC/IGBP “Core Project”, was designed for studies of wet- and dry- atmospheric chemical deposition. Since 1994, the DEBITS network covers a larger part of Africa, through IDAF. IDAF allowed the implementation of 8 atmospheric monitoring stations, representative of the 3 main Africa ecosystems: i.e., dry savannas, wet savannas, and forests.
This paper reports the measurements of monthly mean gaseous nitrogen dioxide (NO2), ammonia (NH3), nitric acid (HNO3), ozone (O3) and sulfur dioxide (SO2) at 7 remote IDAF sites in West and Central Africa over a period of 5 to 10 years using passive samplers: Banizoumbou (Niger), Katibougou and Hombori (Mali) for dry savannas ecosystem; Djougou (Bénin), Lamto (Cote d’Ivoire) for wet savannas ecosystem and Zoétélé (Cameroon) and Bomassa (Congo) for forest ecosystem.
The annual mean concentrations of NO2, NH3, HNO3, SO2 measured in dry savannas are higher than those measured in wet savannas and forests. Annual mean NO2 concentrations vary from 0.9±0.2 in forests to 2.4±0.4 ppb in the dry savannas, NH3 from 3.9±1.4 to 8.8±0.8 ppb, HNO3 from 0.2±0.1 to 0.5±0.2 ppb. Annual mean O3 and SO2 concentrations are low for all the ecosystems and ranged from 4.0±0.4 to 14.0±2.8 and from 0.3±0.1 to 1.0±0.2 ppb, respectively.
A focus on dry savannas processes involved in gases emission is presented in this work, explaining the high concentrations of all gases measured on the three dry savannas sites. Seasonal and interannual variations of gases concentrations are documented and analyzed as a function of emission sources variations. An estimation of biomass burning and biogenic soil emissions of NOx adapted to African ecosystems is presented in order to understand NO2 seasonal cycle concentrations measured on the IDAF sites. This unique database of long term gases concentrations monitoring is available at: http://www.obs-mip.fr/idaf/.
Added by: roussot