摘要
以北京 32 5m气象塔为观测平台 ,于 2 0 0 2年夏季进行了大气污染物臭氧 (O3 )及其前体物氮氧化物 (NOx)和气象要素加强期的同步观测 .对观测资料做了详尽的分析 ,结果表明 :边界层内存在明显的臭氧浓度 (用体积分数表示 )垂直差异 ;中午 1 2 0m高度层存在O3 浓度最大值 ;低层O3 浓度呈明显的日变化 ,且昼夜振幅较大 ;夜间高层 (2 80m)O3 的湍流混合和化学消耗较弱 ,可维持较高的浓度 ;局地光化学生成是白天边界层O3 的主要来源 ;降水天气过程可造成O3 及其前体物浓度的显著变化 .
Based on the Beijing 325m meteorological tower,O 3,NO x and CO concentrations and meteorological parameters in urban atmospheric boundary layer were measured in July 2002.The variations of O 3concentration were remarkably different among the five levels.Contrasted with the higher levels,the daily variations were clear and the difference values between day and night were large in the lower levels.It was also found that the photochemistry reaction was an important source in boundary layer in daytime and precipitation process could arouse marked change of O 3 concentration.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2003年第6期43-47,共5页
Environmental Science
基金
中科院知识创新工程重大项目 (KZCX1 SW 0 1 0 1B)
国家自然科学基金项目 (40 2 0 5 0 0 3)
