NUMERICAL MODELING OF AIR POLLUTANT AND RAINFALL EFFECT ON ACID WET DEPOSITION

It is helpful to go deep into understanding the acid rainfall through studying the relation of two centers between acid deposition and rainfall and the relation of intensity between them.We adopt a three-dimensional Eulerian regional acid deposition model,or NCAR-RADM,to calculate regional chemical concentrations and dry and wet depositions of acids.The temporally and spatially varied meteorological field is provided by a mesoscale meteorological model,vertion 4.We calculate dry and wet depositions of acids in eight kinds of different rainfall distributions.The results show that the wet depositions of acids near pollutant source is very sensitive to rainfall intensity in initial stage.The distribution of acid wet deposition will tend to that of rainfall intensity when rainfall intensity is small in source.And it will tend to that of initial pollutant concentration when rainfall intensity is large in source.