Global two-dimensional chemistry model and simulation of atmospheric chemical composition

A global two-dimensional zonally averaged chemistry model is developed to s tudy the chemical composition of atmosphere. The region of the model is fro m 90 degrees S to 90 degrees N and from the ground to the altitude of 20 km with a resolution of 5 degrees x 1 km. The wind field is residual circulat ion calculated from diabatic rate. 34 species and 104 chemical and photoche mical reactions are considered in the model. The sources of CH4, CO and NOx , which are divided into seasonal sources and nonseasonal sources, are para meterized as a function of latitude and time. The chemical composition of a tmosphere was simulated with emission level of CH4, CO and NOx in 1990. The results are compared with observations and other model results, showing th at the model is successful to simulate the atmospheric chemical composition and distribution of CH4.