Atmos. Chem. Phys. Discuss., 9, 18659-18704, 2009
www.atmos-chem-phys-discuss.net/9/18659/2009/
doi:10.5194/acpd-9-18659-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Numerical simulation of tropospheric injection of biomass burning products by pyro-thermal plumes
C. Rio1, F. Hourdin1, and A. Chédin2
1Laboratoire de Météorologie Dynamique, IPSL, UPMC, 75252 Paris, France
2Laboratoire de Météorologie Dynamique, IPSL, Ecole Polytechnique, 91128 Palaiseau, France

Abstract. 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 fire characteristics, the induced excess of near surface temperature and mixing with 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 CO2 can be injected far above the boundary layer height, leading to a daily excess of CO2 in the mid-troposphere of an order of 2 ppmv. These results agree with satellite retrievals of a diurnal cycle of CO2 in the free troposphere over regions affected by biomass burning in the Tropics.

Citation: Rio, C., Hourdin, F., and Chédin, A.: Numerical simulation of tropospheric injection of biomass burning products by pyro-thermal plumes, Atmos. Chem. Phys. Discuss., 9, 18659-18704, doi:10.5194/acpd-9-18659-2009, 2009.
 
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