基于光化学指标法的邯郸市臭氧生成敏感性  

Applying Photochemical Indicators to Analyze Ozone Sensitivity in Handan

作　　者：牛元 程水源[1] 欧盛菊 姚诗音 沈泽亚 关攀博 NIU Yuan;CHENG Shui-yuan;OU Sheng-ju;YAO Shi-yin;SHEN Ze-ya;GUAN Pan-bo(Key Laboratory of Beijing on Regional Air Pollution Control,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学环境与能源工程学院,区域大气复合污染防治北京市重点实验室,北京100124

出　　处：《环境科学》2021年第6期2691-2698,共8页Environmental Science

基　　金：大气重污染成因与治理攻关项目(DQGG0501,DQGG0509,DQGG020102);国家重点研发计划项目(2018YFC0213206)。

摘　　要：邯郸市近年来O_(3)污染状况越发严峻,2018年夏季(6~8月),邯郸市O_(3)日最大8 h平均浓度为175μg·m^(-3),超标天数达54 d,超标率59%,最高浓度达257μg·m^(-3).本研究应用WRF-CMAQ模式系统和光化学指标法对邯郸市夏季O_(3)生成敏感性特征进行分析.结果表明,用H_(2)O_(2)/HNO_(3)表征O_(3)生成敏感性较其他指标在理论和模拟效果方面均更合适.基于精细化的源清单和网格分辨率,CMAQ对H_(2)O_(2)和HNO_(3)有较好的模拟效果.对H_(2)O_(2)/HNO_(3)的模拟结果显示,邯郸市VOCs控制区范围逐月减少,6月协同控制区范围占比最大,7月和8月以NO_(x)控制区为主.邯郸市各区县VOCs和NO_(x)排放量比值显著的空间差异,是O_(3)生成敏感性差别的主要原因.VOCs/NO_(x)<1.7的区域,其O_(3)生成趋向于受VOCs控制,邯郸南部VOCs/NO_(x)>6.9的区域,NO_(x)是O_(3)生成的主控因子,1.7<VOCs/NO_(x)<6.9的区域更易受到VOCs和NO_(x)的协同控制.当HCHO/NO_(2)、O_(3)/HNO_(3)和O_(3)/NO_(x)过渡范围分别为0.35~0.6、20~35和10~25时,可以得到与H_(2)O_(2)/HNO_(3)较为一致的敏感性空间分布,H_(2)O_(2)/(O_(3)+NO_(2))不能指示出与其他指标一致的结果,表明该指标可能不适用于邯郸市.Ozone pollution in Handan has become severe in recent years and in the summer of 2018,the average maximum daily 8-hour average ozone concentration in Handan was 175μg·m^(-3) with a maximum of 257μg·m^(-3).Ozone concentrations exceeded the National Air Quality GradeⅡStandard in 59%of cases.In this study,the H_(2)O_(2)/HNO_(3) indicator was applied to analyze summertime ozone sensitivity in Handan using the WRF-CMAQ modeling system.The results showed that H_(2)O_(2)/HNO_(3) was more appropriate than other ozone indicators,both theoretically and based on simulation outputs.The good simulation effect of CMAQ on H_(2)O_(2) and HNO_(3) was attributed to fine emission inventory and grid resolution.The H_(2)O_(2)/HNO_(3) simulation results showed that the relative importance of a VOCs-limited regime decreased month by month;a VOCs-NO_(x)-mixed-limited regime was dominant in June;and a NO_(x)-limited regime was more dominant in July and August than in June.The remarkable spatial difference in VOCs and NO_(x) emission ratios among the counties of Handan led to differences in ozone sensitivity.The VOCs-limited regime was concentrated in counties where VOCs/NO_(x) emission ratios were lower than 1.7.Southern counties had a NO_(x)-limited regime,where VOCs/NO_(x) emission ratios were higher than 6.9.Counties with VOCs/NO_(x) emission ratios varying from 1.7 to 6.9 were more susceptible to both VOCs and NO_(x).According to these results,the transition range of HCHO/NO_(2),O_(3)/HNO_(3),and O_(3)/NO_(x) ratios were adjusted to 0.35-0.6,20-35,and 10-25 respectively.Adjusting the transition range of H_(2)O_(2)/(O_(3)+NO_(2))was not effective,indicating that this indicator may not be applicable to Handan.

关 键 词：WRF-CMAQ 光化学指标 邯郸市 臭氧 敏感性 

分 类 号：X515[环境科学与工程—环境工程]