Abstract
A three dimensional Eulerian grid model for a long-range transport of air pollutants with simple physical and chemical processes has developed to evaluate the long-term (annual or seasonal) average acid deposition amounts in East Asia. The calculated results by this model concerning amounts of acid deposition and concentration in precipitation were compared with the observed data in Japan. Furthermore, the evaluation concerning nitrogen oxides was also carried out using this model.
According to the result of the comparison between the calculated values and those of the observed data of SO42-and NO3-wet depositions in 5 divided regions in Japan, this model could represent the feature of wet depositions in each region Simulated monthly SO42-and NO3- concentrations in precipitation indicate reasonable agreement with the observed values at 16 monitoring points in Japan and this mode could also represent the tendency of monthly concentration patterns except for some extreme peaks. The calculated concentration of air pollutants had the same level as observation, and the calculated monthly variation of SO2, NO2 and NO3-concentration showed a good agree ment with observations.
In general, this model is capable of reproducing the deposition tendency in a long term such as annual or seasonal.
