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Tropospheric ozone production related toWest African city emissions during the 2006 wet season AMMA campaign

Ancellet, G. and Orlandi, E. and Real, E. and Law, K.S. and Schlager, H. and Fierli, F. and Nielsen, J.K. and Thouret, V. and Mari, C. (2011) Tropospheric ozone production related toWest African city emissions during the 2006 wet season AMMA campaign. Atmospheric Chemistry and Physics, 11, pp. 6349-6366. DOI: 10.5194/acp-11-6349-2011.

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Official URL: http://www.atmos-chem-phys.net/11/6349/2011/

Abstract

During African Monsoon Multidisciplinary Analyses (AMMA) airborne measurements of ozone, CO and nitrogen oxides (NOx) were collected by French and German Falcon aircraft near three cities in West Africa (Cotonou, Niamey and Ouagadougou). They have been analysed to identify the good conditions to observe ozone plumes related to city emissions during the monsoon season. Results show that an O3 increase of 40�50 ppbv above the summer average concentration took place during two specific events: one near Cotonou on the coast of the Gulf of Guinea, and the other near Niamey in the Sahel region. In both cases a high level of NOx (3�5 ppbv) is related to the ozone production. Air mass transport simulations with FLEXPART and a tracer simulation with the BOLAM mesoscale model shows that Southern Hemisphere biomass burning emissions are always at higher altitude (>3 km) compared to the city emissions. In Niamey and Ouagadougou, the daily variability of ozone and CO correlates with the FLEXPART analysis showing the role of air mass stagnation near the city for 1�2 days and advection of emissions from the vegetated areas. Absence of ozone enhancements for high CO values can be explained by the occurrence of deep convection near the city. In the Sahel region, convection must be accounted for to understand the small number of observed ozone plumes but also to explain the high level of NOx in the 3�5 ppbv range, due to increasing soil emissions after rainfall. To verify that daily ozone production can reach 20 ppbv day�1 for the NOx and CO conditions encountered near West African cities, a simulation of the CiTTyCAT Lagrangian model was conducted using the observed average chemical composition reported by other aircraft during AMMA. Such ozone production is possible for NOx levels up to 5 ppb showing that West African cities are potentially significant sources of tropospheric ozone.

Document Type:Article
Title:Tropospheric ozone production related toWest African city emissions during the 2006 wet season AMMA campaign
Authors:
AuthorsInstitution or Email of Authors
Ancellet, G.Univ. Versailles, St-Quentin, F
Orlandi, E.National Research Council, Bologna, I
Real, E.Univ. Versailles, St-Quentin, F
Law, K.S.Univ. Versailles, St-Quentin, F
Schlager, H.DLR
Fierli, F.National Research Council, Bologna, I
Nielsen, J.K.Danish Meteorol. Inst., Lyngbyvej, DK
Thouret, V.Univ. de Toulouse, F
Mari, C.Univ. de Toulouse, F
Date:2011
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI:10.5194/acp-11-6349-2011
Page Range:pp. 6349-6366
Status:Published
Keywords:ozone, West Africa, monsoon
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Yasemin Yilmaz
Deposited On:05 Dec 2011 11:22
Last Modified:12 Dec 2013 21:27

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