Simulation of ozone production in a complex circulation region using nested grids M. Taghavi, S. Cautenet, and G. Foret Laboratoire de Météorologie Physique, OPGC-CNRS and Université Blaise Pascal, Aubière, France
Abstract. During the ESCOMPTE precampaign (summer 2000, over Southern France), a 3-day
period of intensive observation (IOP0), associated with ozone peaks, has been
simulated. The comprehensive RAMS model, version 4.3, coupled on-line with a
chemical module including 29 species, is used to follow the chemistry of the
polluted zone. This efficient but time consuming method can be used because
the code is installed on a parallel computer, the SGI 3800. Two runs are
performed: run 1 with a single grid and run 2 with two nested grids. The
simulated fields of ozone, carbon monoxide, nitrogen oxides and sulfur dioxide
are compared with aircraft and surface station measurements. The 2-grid run
looks substantially better than the run with one grid because the former takes
the outer pollutants into account. This on-line method helps to satisfactorily
retrieve the chemical species redistribution and to explain the impact of
dynamics on this redistribution.
Citation: Taghavi, M., Cautenet, S., and Foret, G.: Simulation of ozone production in a complex circulation region using nested grids, Atmos. Chem. Phys., 4, 825-838, doi:10.5194/acp-4-825-2004, 2004.