A Study of the Gas-to-Particle Conversion in Photochemical Process
对流层光化学过程中的气粒转化研究

By evaluating MMS (the Fifth Generation Penn State/ NCAR Mesoscale Model), RADM (Regional Acid Deposition Model) and MARS (The Model for an Aerosol Reacting System), a coupled regional photochemical model is developed to study the transformation processes from gas to Particle. With this coupled model, the characteristics of spatial and temporal distribution and variation of regional tropospheric photochemical precursors, products in the northern China are studied, such as SO2, NO2, O3, H3SO4, and HNO3. On the basis of this, the ammonia emission is considered and its spatial and temporal distribution and variation are obtained. The main conclusions are: the distribution of total dry particles is strongly correlated with the emission of SO2, NO2, and NH3; the total dry aerosol amount is mainly determined by H2SO4 concentration in ammonia-rich environment; the water amount in aerosol does not have good relationship with the distribution of dry aerosol, and it is mainly determined by the relative humidity.