摘要
建立了一个三维的边界层光化学模式 ,气象过程的模拟舍弃了静力近似的假定 ,模式由细网格、高分辨率并取湍流能量 (E- ε)闭合的气象模式 ,提供较为细致的气流场和湍流场。文章中以汽车尾气和植物排放为光化学反应前体物的源 ,模拟了不同季节南京市的光化学过程以及臭氧随时间和空间的分布。结果表明 ,夏季南京市的地面臭氧浓度远远高于冬季 ,臭氧分布有所不同。并且在不少地方出现较高的 O3 浓度值 ,超过国家二级标准 。
A three dimensional photochemical model for urban boundary layer is set up.In order to provide a more accurate advection and turbulence process for the simulation of the distribution of the species,the simple energy(E ε)closure scheme was used when we simulate the meteorological process in the three dimensional model.Traffic gas emissions,biogenic hydrocarbon emissions were considered as the procedure of the photochemical pollution.The distributions of the photochemical pollutants at different times and different places in both winter and summer in Nanjing city were simulated by the three dimensional photochemical model.It is showed that the concentrations of photochemical pollutants in summer are much higher than that in winter.In summer,there are many places in Nanjing city where high concentration of O 3 and PAN were found,those concentration are much higher than the national standards.In Nanjing,the pollution of PAN is more serious than that of O 3,because of the different wind directions at different seasons in Nanjing,there are different distributions of photochemical pollutants in the whole city at different seasons.The effect of wind on the distribution is more obvious at higher height.
出处
《气象科学》
CSCD
北大核心
2001年第4期409-416,共8页
Journal of the Meteorological Sciences
基金
江苏省自然科学基金项目 BK970 2 8
中科院知识创新工程项目 KZCX2 -2 0 4资助
