ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-3463-2010 Numerical simulation of tropospheric injection of biomass burning products by pyro-thermal plumes Rio C. 1 Hourdin F. 1 Chédin A. 2 Laboratoire de Météorologie Dynamique, UMR8539, CNRS/IPSL, UPMC, 75252 Paris, France Laboratoire de Météorologie Dynamique, UMR8539, CNRS/IPSL, Ecole Polytechnique, 91128 Palaiseau, France 16 04 2010 10 8 3463 3478 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/3463/2010/acp-10-3463-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/3463/2010/acp-10-3463-2010.pdf

The thermal plume model, a mass-flux scheme originally developed to represent the vertical transport by convective structures within the boundary layer, is adapted to the representation of plumes generated by fires, with the aim of estimating the height at which fire emissions are actually injected in the atmosphere. The parameterization, which takes into account the excess of near surface temperature induced by fires and the mixing between convective plumes and environmental air, is first evaluated on two well-documented fires. Simulations over Southern Africa performed with the general circulation model LMDZ over one month show that the CO<sub>2</sub> can be injected far above the boundary layer height, leading to a daily excess of CO<sub>2</sub> in the mid-troposphere of an order of 2 ppmv. These results agree with satellite retrievals of a diurnal cycle of CO<sub>2</sub> in the free troposphere over regions affected by biomass burning in the Tropics.

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