区域对流层光化学过程研究

摘要

By evaluating MM5 (the Fifth Generation Penn State/NCAR Mesoscale Model) and RADM (Regional Acid Deposition Model), a coupled regional photochemical model is developed to study tropospheric photochemical process. The spatial and temporal distributions and variations of regional tropospheric photochemical precursors, tracers and products such as SO2, NO2, O3, PAN, H2SO4, and HNO3 in northern China are studied with this coupled model. Based on this, the relative roles of horizontal advection, vertical diffusion and deposition as well as chemical transformation in the photochemical processes are analyzed. The results show that horizontal advection and vertical diffusion as well as deposition play an important role in influencing concentration distribution and its variation of photochemical precursors, tracers and products.%将MM5 和RADM耦合，建立了一个区域大气光化学模式。用此模式来研究区域大气光化学过程。分析了大气光化学过程中前体物、自由基以及主要产物的时空分布及其随时间的变化情况。得到了大气光化学过程各主要成分的分布及其演变特征。在此基础上，分析了水平平流、垂直扩散及沉降以及化学转化等物理、化学过程在大气光化学过程中的相对重要性，结果表明，水平平流和垂直扩散及沉降等物理过程对大气光化学过程中各种成分的浓度分布及其随时间的变化有重要的作用。