A numerical study on tropospheric ozone over China

A three-dimensional Eulerian model for regional tropospheric ozone simulation was developed. It includes transport, photochemical reactions, effects of cloud on ozone, pollutant emissions and depositions. Considering the factors that affect ozone photochemical transformation and some typical characteristics of air photochemical pollution in China, ozone photochemical transformation rate was used to avoid the huge amount of numerical calculation of chemical dynamic equations. Compared with averaged ozone observation data, simulation of effect of cloud on ozone was studied and the ozone consuming rate by cloud is specified by numerical test. Through numerical simulation, yearly-averaged distribution of tropospheric ozone (especially surface ozone) over China, its seasonal changes, and some distribution features of urban photochemical pollution in China were studied.