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. De-nombreux-travaux-indiquent and . Qu, Nous avons utilisé le modèle méso-´ echelle 3D non-hydrostatique CATT-BRAMS pourétudierpourétudier le transport de traceurs dans la troposphère tropicale au-dessus de l'Amérique du Sud J'ai effectué une validation de l'outil en complément d'uné etude en saison s` eche et dans les basses couches menée au CPTEC (Brésil) Les résultats obtenus dans ces travaux indiquent un comportement météorologique globalement correct. Le transport en résultant montre une sur-estimation du transport d'espèces chimiques dans la moyenne troposphère et une sous-estimation dans la haute troposphère. Cela vient d'un déclenchement trop fréquent de la convection restreinte, de la paramétrisation de la convection profonde et de la représentation de leurs interactions. Une adaptation du modèle pour la saison humide est nécessaire. A l'´ echelle locale des difficultés venant d'une sensibilité importante de la paramétrisation au relief sont rencontrées. Le CATT-BRAMSévolueBRAMSévolue vers un modèle avec chimie, le C-CATT-BRAMS, Les premiers résultats obtenus indiquent un fort impact de l'initialisation et des conditions aux limites pour les espèces N O et O3. Quelques soient l'initialisation ou les conditions aux limites utilisées, on observe une augmentation du rapport de mélange de ces espèces au cours du temps. Cela peut provenir d'une sur-estimation desémissionsàdesémissionsdesémissionsà la surface dans le modèle, en particulier pour les méga-cités. Il est important de poursuivre la validation de cet outil afin de pouvoirétudierpouvoirétudier l'impact physico-chimique de la convection profonde tropicale avec ce modèle