应用一个较详细的气相光化学和液相化学耦合的箱体模式，研究了云层对云中大气臭氧的影响过程。这一过程可分解为三个因子来考虑：因子A（云的辐射效应），由于云的存在改变太阳光辐射通量，使得对流层光化学反应减弱或增强，从而降低或增加臭氧浓度；因子B（云的吸收效应），云层中液态水对大气臭氧及其前体物（NOx、NMHC、自由基等）的直接吸收作用；因子C（云的液相化学效应），吸收进入云中的物质发生液相化学反应从而改变大气臭氧浓度。数值研究结果表明：上述三因子对云中臭氧浓度影响的程度差别很大，并且与云层的物理结构有密切关系。讨论了云的吸收及液相化学效应影响臭氧浓度的主要原因。

应用浙江临安1999年秋季非甲烷碳氢化合物（NMHC）观测数据，分析了NMHC特征，并估计其对该地O3的影响。该地NMHC芳香烃含量最高为479%，其次为：烷烃291%，烯烃127%，炔烃82%，生物排放的烃21%。从各NMHC成份相关分析发现，NMHC主要排放源是该地生物物质（柴草、秸秆、农业废弃物）焚烧，存在未知芳香烃人为源的可能。丙烯等量浓度分析表明，芳香烃、CO、生物源烃和烯烃对该地O3均有重要贡献。观测和模式分析显示本次观测的O3处于NMHC控制区。

[1] The seasonal variation of boundary layer ozone over East Asia is investigated using a regional scale chemical transport model, with the initial and boundary conditions of chemical species obtained from a global chemistry model. Comparisons with observations indicate that the model reproduces the main daily and seasonal features of ozone over eastern Asia. The seasonal variation of ozone has a summer maximum and winter minimum at Waliguan station (on the northeastern edge of the Tibetan Plateau), rather than the spring maximum and summer minimum seen at many other observational sites in the East Asian Pacific rim region. Model results suggest that there is band of a high ozone between 35°N～45°N from the western boundary (70°E) to 130°E in the summertime. It is concluded that the seasonal transitions associated with the Asian monsoon system and transport from eastern/central China, Central/South Asia and even Europe are significantly responsible for the distinct ozone seasonal cycle at Waliguan.