区域环境与生态
徐峻,张远航.北京市区夏季O3生成过程分析[J].环境科学学报,2006,26(6):973-980
北京市区夏季O3生成过程分析
- Process analysis of O3 formation in summer at Beijing
- 基金项目：国家重点基础研究发展规划项目(No.2002CB410801)
- 作者
- 单位
- 徐峻
- 1. 北京大学环境学院, 北京 100871; 2. 中国环境科学研究院, 北京 100012
- 张远航
- 北京大学环境学院, 北京 100871
- 摘要：采用三维空气质量模型CMAQ-MADRID对北京地区夏季O3进行模拟,利用过程分析模块IPR和IRR研究北京市区大气O3的生成过程,重点分析自由基循环和NOx循环的量化特征.结果表明,市区整个边界层具有较强的大气氧化性,O3生成呈现VOC控制的特征.边界层内O3大气化学过程存在垂直差异,O3生成高值区在200～800m之间,近地层O3浓度升高主要依赖边界层内高层大气O3的垂直输送.NOx排放集中在近地层,新NO注入量较高,NOx循环次数仅为1.3,O3生成量很低.边界层上层大气从低层获得NOx,由于新NO注入量较低,同时上层大气保持了较强的大气氧化性,NOx循环次数达到5.0,O3生成量较高.
- Abstract：A three dimension air quality model CMAQ-MADRID was employed to simulate O3 pollution in summer at Beijing. IPR and IRR, modules of process analysis in CMAQ, were used to explore the O3 building process in urban area with focus on radical and NOx cycles. In urban area, strong oxidation capacity was spread to full boundary layer, and O3 formation was in VOC-limited regime. Obvious discrepancy of O3 building process existed between surface layer and upper level of boundary layer, with high O3 production rate at altitude of 200～800 m, and the high O3 concentration at surface layer mainly came from O3 vertical transportation of upper air. Since NOx emission was concentrated at surface layer, new NO input was quite high and NOx chain length was only 1.3, resulting in a low O3 yield. At upper level of boundary layer, where the oxidation capacity was strong and new NO input was low, NOx chain length reached 5.0, thus O3 yield there was rather high.
- Key words：O3 urban area process analysis air quality model
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