The sensitivity of ozone formation judged by generation rate ratio of H2O2 and HNO3

为了更好地理解珠三角臭氧污染特性，使用中尺度气象模型与三维空气质量模型 MM5-CAMx v5．20系统，并调用化学过程分析等模块，基于2004年10月这一典型污染时段，对使用 H2 O2与 HNO3生成速率比值（p（H2 O2）/p（HNO3））判别珠三角臭氧生成敏感性的适用性进行了研究。结果表明：在珠三角地区，当 p（H2 O2）/p（HNO3）＜0．35时，可以断定其为臭氧生成的挥发性有机物（VOC）控制区，比值在0．35～1．6为过渡区，而比值大于1．6时为臭氧生成的 NOx 控制区。在秋季各种污染类型下，珠江口东部、佛山南部、广佛交界处白天都是臭氧生成的强 VOC 控制区；而珠三角西部与西南部则经历了从早上臭氧生成的 VOC 控制区或过渡区向下午 NOx 控制区的演变，珠三角北部与东部等大部分地区为臭氧生成的 NOx 控制区。To understand well the ozone pollution characteristics in the Pearl River Delta (PRD),the mesoscale meteorological model and the three-dimensional comprehensive air quality model MM5-CAMx v5.20 system was applied.Using the chemistry process analysis module,the suitability of p(H2 O2 )/p(HNO3 )to verify ozone formation sensitivity in PRD was studied based on a typical pollution episode in October 2004.The results show ozone formation is VOC-sensitive when p (H2 O2 )/p (HNO3 )<0.35,it is transition regime when p(H2 O2 )/p(HNO3 )between 0.35 and 1.6,and it is NOx-sensitive regime with p(H2 O2 )/p (HNO3 )> 1.6.In various kinds of episode in autumn,the ozone formation is VOC-sensitive in the eastern Pearl River estuary, southern Foshan and the boarder of Guangzhou and Foshan.While most parts of western and southwestern PRD experience the transformation from VOC-sensitive or transition regime in the morning to NOx-sensitive in the afternoon,and the north and east part of PRD is NOx-sensitive.国家自然科学基金资助项目06725-72