Author(s)

S. Galmarini, J. Vila-Guerau de Arellano & P.G. Duynkerke

Abstract

The effect of turbulent mixing on the reaction rate in a chemically reactive plume model S. Galmarini, J. Vila-Guerau de Arellano, P.G. Duynkerke (IMAU) Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands ABSTRACT A chemically reactive plume model is used to study the effect of atmospheric turbulence on the reaction between NO and O]. For simplicity only the cycle NO-Oa-NQ? is considered. For the inert species NO% (defined as NO% - NO+NO2) a Gaussian profile is assumed. The release of NO% takes place in a neutral atmospheric boundary layer. A second-order closure model is used to calculate concentration (co-)variances for the chemically reactive species. The closure model results dependent upon the ratio of time scales of turbulence and chemistry; the Damkohler number. The development of the downstream chemistry clearly shows the existence of three different phases:

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