Simulation of ozone production in a complex circulation region using nested grids

[摘要] During the ESCOMPTE precampaign (summer 2000, over Southern France), a 3-dayperiod of intensive observation (IOP0), associated with ozone peaks, has beensimulated. The comprehensive RAMS model, version 4.3, coupled on-line with achemical module including 29 species, is used to follow the chemistry of thepolluted zone. This efficient but time consuming method can be used becausethe code is installed on a parallel computer, the SGI 3800. Two runs areperformed: run 1 with a single grid and run 2 with two nested grids. Thesimulated fields of ozone, carbon monoxide, nitrogen oxides and sulfur dioxideare compared with aircraft and surface station measurements. The 2-grid runlooks substantially better than the run with one grid because the former takesthe outer pollutants into account. This on-line method helps to satisfactorilyretrieve the chemical species redistribution and to explain the impact ofdynamics on this redistribution.

[学科分类] 大气科学