Atmos. Chem. Phys. Discuss., 3, 5803-5829, 2003
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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.
Volatile particles formation during PartEmis: a modelling study
X. Vancassel1,*, A. Sorokin2, P. Mirabel1, A. Petzold3, and C. Wilson4
1Centre de Géochimie de la Surface, Université Louis Pasteur, Strasbourg, France
2Central Institute for Aviation Motors, Moskow, Russia
3Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen, Germany
4QinetiQ, Farnborough, UK
*now at: Atmospheric, Oceanic and Planetary Physics, University of Oxford, UK

Abstract. A modelling study of the formation of volatile particles in a combustor exhaust has been carried out in the frame of the PartEmis European project. A kinetic model has been used in order to investigate nucleation efficiency of the H2O-H2SO4 binary mixture in the sampling system. A value for the fraction e of the fuel sulphur S(IV) converted into S(VI) has been indirectly deduced from comparisons between model results and measurements. In the present study, e ranges between roughly 2.5% and 6%, depending on the combustor settings and on the microphysical approach used. Soot particles hygroscopicity has also been investigated as their activation is a key parameter for contrail formation. Growth factors of monodisperse particles exposed to high relative humidity (95%) have been calculated and compared with experimental results. The modelling study confirms that the growth factor increases as the soot particle size decreases.

Citation: Vancassel, X., Sorokin, A., Mirabel, P., Petzold, A., and Wilson, C.: Volatile particles formation during PartEmis: a modelling study, Atmos. Chem. Phys. Discuss., 3, 5803-5829, doi:10.5194/acpd-3-5803-2003, 2003.
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