H_2O_2与HNO_3生成速率比值判别臭氧生成敏感性

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H2O2与HNO3生成速率比值(p(H2O2)/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(H2O2)/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。

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

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.