Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-969
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
20 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
LES study of the impact of moist thermals on the oxidative capacity of the atmosphere in southern West Africa
Fabien Brosse1, Maud Leriche1, Céline Mari1, and Fleur Couvreux2 1Laboratoire d’Aérologie, Université de Toulouse, CNRS, UPS, France
2CNRM-GAME, Météo-France & CNRS, Toulouse, France
Abstract. The hydroxyl radical (OH) is a highly reactive specie and plays a key role in the oxidative capacity of the atmosphere. The total OH reactivity, corresponding to the inverse of OH lifetime, may have a significant fraction non-attributable to commonly measured compounds. The turbulence-driven segregation of OH and its reactants can cause substantial modification of averaged reaction rates, and thus of the total OH reactivity, when compared to a perfectly mixed assumption. We study the impact of turbulent mixing on the OH reactivity with Large-Eddy Simulations from the Meso-NH model coupled on-line with a detailed chemistry mechanism in two contrasted regimes. Our findings show that the non-mixing of isoprene (resp. aldehydes) and OH leads to 30 % decrease (resp. 16 % increase) of the mean reaction rate at the top of the boundary layer and consequently to 9 % decrease (resp. 5 % increase) of the OH total reactivity in a biogenic (resp. anthropogenic) environment. Moreover, the total OH reactivity is highest inside thermals in both cases.

Citation: Brosse, F., Leriche, M., Mari, C., and Couvreux, F.: LES study of the impact of moist thermals on the oxidative capacity of the atmosphere in southern West Africa, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-969, in review, 2017.
Fabien Brosse et al.
Fabien Brosse et al.
Fabien Brosse et al.

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