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Communication incl. Poster: BibTeX citation key:  Barret
Barret, B., Williams, J. E., Bouarar, I., Sauvage, B., Yang, X., Josse, B., Le Flochmoën, E., Peuch, V.-H., Van Velthoven, P. F. J., Law, K. S., Pyle, J. A. & Liousse, C. 2009. Impact of West African Monsoon convective mixing and lightning NOx production upon upper tropospheric O3: A multi-model study. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-19 18:34:18
Categories: Aerosol and Chemistry
Keywords: Chemistry
Creators: Barret, Bouarar, Josse, Law, Le Flochmoën, Liousse, Peuch, Pyle, Sauvage, Van Velthoven, Williams, Yang
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Deep convection plays a key role in controlling tropical tropospheric ozone (O3), one of the most important greenhouse gases. It is responsible both for vertical mixing of O3 and its precursors and for the production of nitrogen oxides by lightnings (LiNOx). Nevertheless, the impact of convective processes upon tropospheric O3 is highly uncertain. The use of parameterizations to simulate convective processes in Chemistry Transport Models (CTM’s) is an important contributor to this uncertainty. Our study aims at quantifying the impacts of West African Monsoon (WAM) convective transport and LiNOx production upon the regional and global Upper Tropospheric (UT) O3 budget.
In the framework of AMMA, 4 CTM’s have been run for the year 2006 with similar surface emissions inventories and meteorological forcings. The impact of WAM LiNOx and convective transport upon UT O3 has been quantified with sensitivity simulations. The chemical observations from 4 aircrafts during the AMMA campaign are used for evaluating the models over West Africa. MOZAIC Air-Namibia measurements of CO and O3 allow assessing the ability of the models to reproduce the CO and O3 seasonal African UT transects. Finally, the global distributions of UT O3 and CO measured by the space-borne Aura/MLS sensor are used to validate the models on a broader scale.
The 4 CTM’s are able to reproduce the broad features of UT O3 and CO distributions but show important discrepancies with the detailed AMMA observations. They also give consistent results about the relative impacts of LiNOx and convection upon UT O3. Nevertheless, the different convection and LiNOx parameterizations result in important discrepancies in the localization and amplitude of the impacts.
Added by: roussot