Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 14 2008 10.5194/acp-8-3951-2008 http://www.atmos-chem-phys.net/8/3951/2008/ http://www.atmos-chem-phys.net/8/3951/2008/acp-8-3951-2008.html http://www.atmos-chem-phys.net/8/3951/2008/acp-8-3951-2008.pdf 3951 3961 2008-07-24 Tracing biomass burning plumes from the Southern Hemisphere during the AMMA 2006 wet season experiment C. H. Mari marc@aero.obs-mip.fr G. Cailley L. Corre M. Saunois J. L. Attié V. Thouret A. Stohl Université de Toulouse, CNRS/INSU, Laboratoire d'Aérologie, Toulouse, France SILOGIC, Toulouse, France Norwegian Institute for Air Research, Kjeller, Norway The Lagrangian particle dispersion model FLEXPART coupled with daily active fire products provided by the MODIS instrument was used to forecast the intrusions of the southern hemispheric fire plumes in the Northern Hemisphere during the AMMA (African Monsoon Multidisciplinary Analysis) fourth airborne campaign from 25 July to 31 August 2006 (Special Operation Period SOP2_a2). The imprint of the biomass burning plumes over the Gulf of Guinea showed a well marked intraseasonal variability which is controlled by the position and strength of the southern hemispheric African Easterly Jet (AEJ-S). Three different periods were identified which correspond to active and break phases of the AEJ-S: 25 July–2 August (active phase), 3 August–8 August (break phase) and 9 August–31 August (active phase). 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