Atmos. Chem. Phys. Discuss., 5, 3621-3639, 2005
www.atmos-chem-phys-discuss.net/5/3621/2005/
doi:10.5194/acpd-5-3621-2005
© Author(s) 2005. This work is licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
A Lagrangian Stochastic Model for the concentration fluctuations
L. Mortarini1,3 and E. Ferrero2,3
1Dipartimento di Fisica Generale, Universitá di Torino, v. P. Giuria 1, 10125 Torino, Italy
2Dipartimento di Scienze e Tecnologie Avanzate, Universitá del Piemonte Orientale, Via Bellini, 25/G 15100 Alessandria, Italy
3ISAC-CNR, Corso Fiume 4, 10133 Torino, Italy

Abstract. A Lagrangian Stochastic Model for the two-particles dispersion, aiming at simulating the pollutant concentration fluctuations, is presented. Three model versions (1-D, 2-D and 3-D) are tested. Firstly the ability of the model to reproduce the two-particle statistics in a homogeneous isotropic turbulence is discussed, comparing the model results with theoretical predictions in terms of the probability density function (PDF) of the particles separation and its statistics. Then, the mean concentration and its fluctuations are considered and the results presented. The influence of the PDF of the particle separation on the concentration fluctuations is shown and discussed. We found that the separation PDF in the inertial subrange is not gaussian and this fact influences the predicted concentration fluctuations.

Citation: Mortarini, L. and Ferrero, E.: A Lagrangian Stochastic Model for the concentration fluctuations, Atmos. Chem. Phys. Discuss., 5, 3621-3639, doi:10.5194/acpd-5-3621-2005, 2005.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share