Title: Turbulence closure in atmospheric circulation model and its influence on the dispersion

Authors: S. Alessandrini, E. Ferrero, C. Pertot, S. Trini Castelli, E. Orlandi

Addresses: CESI RICERCA, via Rubattino 54, 20134 Milano, Italy. ' Dipartimento di Scienze e Tecnologie Avanzate, Universita del Piemonte Orientale 'A. Avogadro', Via Bellini, 25/G, Alessandria, Italy. ' ISMES Divisione Ambiente e Territorio di CESI Spa, via Rubattino 54, 20134 Milano, Italy. ' Istituto di Scienze dell'Atmosfera e del Clima, Corso Fiume 4, Torino, Italy. ' CESI RICERCA, via Rubattino 54, 20134 Milano, Italy

Abstract: In this work the comparisons between measured and numerically simulated tracer experiments are presented for two different datasets. Different versions of the model system RMS, including the Regional Atmospheric Modelling System (RAMS) and the dispersion model SPRAY, accounting for alternative turbulence closures are used. These last are the Mellor and Yamada model level 2.5 and two versions of the E-l model, the standard isotropic and anisotropic versions. Moreover, simulations performed with the CALPUFF dispersion model coupled with RAMS are also presented. The wind fields and the ground level concentrations produced by the two model systems are shown and compared.

Keywords: dispersion modelling; turbulence closures; model comparisons; atmospheric circulation modelling; air pollution; pollutant dispersion; wind fields; ground level concentrations.

DOI: 10.1504/IJEP.2010.030881

International Journal of Environment and Pollution, 2010 Vol.40 No.1/2/3, pp.36 - 48

Published online: 11 Jan 2010 *

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