研究报告
张晓,鲍晓磊,赵江伟,贺军亮.基于观测数据的石家庄交通干线附近臭氧光化学敏感性分析[J].环境科学学报,2021,41(12):5047-5054
基于观测数据的石家庄交通干线附近臭氧光化学敏感性分析
- Analysis on the ozone formation sensitivity based on observation at the traffic trunk roads of Shijiazhuang
- 关键词：O3生成效率(OPE) 光化学敏感性 NOx临界浓度 石家庄 交通干线
- 基金项目：河北省青年科学基金项目（No.D2019106042）；河北省自然科学基金面上项目（No.D2021106002）
- 作者
- 单位
- 张晓
- 石家庄学院资源与环境科学学院, 石家庄 050035
- 鲍晓磊
- 河北省生态环境科学研究院, 石家庄 050037
- 赵江伟
- 河北省生态环境监测中心, 石家庄 050037
- 贺军亮
- 石家庄学院资源与环境科学学院, 石家庄 050035
- 摘要：为确定石家庄东部郊区交通干线附近O3生成光化学敏感性,利用2019年1月1日—2020年10月31日在线观测的NOx、NOy和O3等数据计算并分析了O3生成效率(OPE)及O3光化学敏感性的NOx临界浓度.结果表明:1交通干线附近O3光化学敏感性存在季节差异,春季主要受VOCs控制,整体OPE为2.6±0.3,夏、秋季节主要受NOx与VOCs协同控制,整体OPE分别为5.3±0.4和5.1±0.8;2NOx体积分数>11×10-9时,O3生成主要为VOCs控制;NOx体积分数介于6×10-9~11×10-9时,O3生成主要受VOCs与NOx协同控制;NOx体积分数<6×10-9时,O3生成主要为NOx控制;3O3生成敏感性存在日变化特征,10:00之前O3生成主要受VOCs控制,10:00—11:00是O3生成由VOCs控制转变为VOCs和NOx协同控制的过渡时段,12:00之后O3生成主要由VOCs和NOx协同控制,且午后14:00—16:00之间NOx对O3控制比例凸显.因此,石家庄O3治理不但要重视NOx与VOCs排放源的协同管控,尤其午后还需要对NOx排放源进行分时段精细化管控.
- Abstract：In order to study the formation sensitivity of ozone at the Traffic Trunk Roads site located in the eastern suburbs of Shijiazhuang, ozone production efficiency (OPE) and critical NOx concentration was calculated and analyzed using the on-line data from 1 January 2019 to 31 October 2020. The observed results were listed following: 1The formation sensitivity of ozone was of significantly seasonal variation. OPE was 5.3±0.4 and 5.1±0.8 in summer and autumn, respectively, controlled by synergistic effect of NOx and VOCs. While the OPE in spring was 2.6±0.3, and mainly controlled by VOCs. 2The NOx volume fraction was less than 6×10-9, between 6×10-9 and 11×10-9, and greater than 11×10-9 correspond to that the ozone formation limited by NOx, NOx-VOCs and VOCs, respectively. 3The ozone formation sensitivity was daily variant, controlled by the NOx critical concentration. The transformation period when the ozone formation gradually transferred from being VOCs-sensitive to NOx-VOCs-sensitive was from 10:00 to 11:00. The ozone formation was VOCs-sensitive before 10:00, and was limited by NOx-VOCs after 12:00, and the ozone formation sensitivity to NOx increased in the afternoon. Thus, the ozone management in Shijiazhuang should not only pay attention to the coordinated control of NOx and VOCs emission sources, especially in the afternoon, but also need to carry out time-divided fine control of NOx emission sources.
- Key words：ozone production efficiency(OPE) ozone formation sensitivity critical NOx concentration Shijiazhuang traffic trunk roads
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