中文关键词WRF-CMAQ光化学指标邯郸市臭氧敏感性 英文关键词WRF-CMAQphotochemical indicatorHandan Cityozonesensitivity

作者	单位	E-mail
牛元	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	niuyuan@emails.bjut.edu.cn
程水源	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	chengsy@bjut.edu.cn
欧盛菊	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
姚诗音	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
沈泽亚	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
关攀博	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

中文摘要 邯郸市近年来O₃污染状况越发严峻，2018年夏季（6~8月），邯郸市O₃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O₃生成敏感性特征进行分析.结果表明，用H₂O₂/HNO₃表征O₃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H₂O₂和HNO₃有较好的模拟效果.对H₂O₂/HNO₃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O₃生成敏感性差别的主要原因.VOCs/NO_x<1.7的区域，其O₃生成趋向于受VOCs控制，邯郸南部VOCs/NO_x>6.9的区域，NO_x是O₃生成的主控因子，1.7x<6.9的区域更易受到VOCs和NO_x的协同控制.当HCHO/NO₂、O₃/HNO₃和O₃/NO_x过渡范围分别为0.35~0.6、20~35和10~25时，可以得到与H₂O₂/HNO₃较为一致的敏感性空间分布，H₂O₂/（O₃+NO₂）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. 英文摘要 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 175 μg·m^-3 with a maximum of 257 μg·m^-3. Ozone concentrations exceeded the National Air Quality Grade Ⅱ Standard in 59% of cases. In this study, the H₂O₂/HNO₃ indicator was applied to analyze summertime ozone sensitivity in Handan using the WRF-CMAQ modeling system. The results showed that H₂O₂/HNO₃ was more appropriate than other ozone indicators, both theoretically and based on simulation outputs. The good simulation effect of CMAQ on H₂O₂ and HNO₃ was attributed to fine emission inventory and grid resolution. The H₂O₂/HNO₃ 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/NO₂, O₃/HNO₃, and O₃/NO_x ratios were adjusted to 0.35-0.6, 20-35, and 10-25 respectively. Adjusting the transition range of H₂O₂/(O₃+NO₂) was not effective, indicating that this indicator may not be applicable to Handan.

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