| 基于Brute-Force方法的京津冀区域夏季臭氧反应机制 |
| 摘要点击 2290 全文点击 817 投稿时间：2022-10-16 修订日期：2022-12-04 |
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| 中文关键词 京津冀区域 臭氧(O3) 前体物响应 敏感区 WRF-Chem模式 |
| 英文关键词 Beijing-Tianjin-Hebei Region ozone(O3) precursor response sensitivity regimes WRF-Chem model |
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| 中文摘要 |
| 近年来京津冀区域夏季臭氧（O3）体积分数仍居高位，轻中度污染频繁发生，相关反应机制研究亟需开展.利用WRF-Chem模式对该区域2018年夏季代表月O3浓度进行模拟，并基于Brute-Force方法探究了区域层面前体物减排的O3变化.O3在不同排放情景的变化表明，该区域O3反应机制以VOCs控制区与非敏感区为主，VOCs控制区主要聚集京津冀中部，呈南北带状分布，面积占比15.60%~26.59%.区域各市城区的O3浓度对前体物排放的相对响应强度（RRI）具有很大的空间差异性，对于VOCs，RRI_VOC在0.03~0.16范围内；而对于NOx，RRI_NOx在-0.40~0.03范围内.纬度越高的城区，RRI值越剧烈，表明了越为显著的区域输送影响.前体物排放强度高的城区，RRI_NOx值越低，暗示RRI_NOx对当地NO2浓度的负向依赖；但RRI_VOC与NO2水平无明显关联，更依赖于对前体物相对丰度（VOCs ：NOx）.RRI_VOC与RRI_NOx比值在多数城市表现为负值，VOCs协同减排以抑制O3浓度恶化十分必要；该比值的绝对值在工业化和城市化高的城市远低于普通中小城市，意味着这些城市VOCs协同减排的要求将更高.然而，即使在前体物50%减排下，区域各城市O3浓度改善仍然有限，毗邻省份的区域外联合治理也依然重要. |
| 英文摘要 |
| In recent years, the ozone (O3) volume fraction in the Beijing-Tianjin-Hebei Region in summer have remained high, light to moderate pollution occurs frequently, and research on related response mechanisms is urgently needed. This study applied the WRF-Chem model to simulate the change in ozone volume fraction in this region by setting 13 precursor emission scenarios in a representative month in the summer of 2018. The results revealed that VOC-sensitivity and no-sensitivity regimes commonly occurred in the Beijing-Tianjin-Hebei Region in July, and the VOC-sensitivity regimes were mainly accumulated in the central Beijing-Tianjin-Hebei Region, with a north-to-south zonal distribution and an area share of 15.60%-26.59%. The relative response intensity (RRI) of O3 volume fraction to precursor emissions in urban areas had large spatial variability, with RRI_VOC and RRI_NOx in the ranges of 0.03-0.16 and -0.40-0.03, respectively. The higher the latitude of urban areas, the more dramatic were the RRI values, indicating a more significant regional transport influence. The lower RRI_NOx values in urban areas with high intensity of precursor emissions implied a negative dependence of RRI_NOx on local NO2 concentrations; however, RRI_VOC was not significantly correlated with NO2levels and was more dependent on the relative abundance of precursors (VOCs:NOx). The ratio of RRI_VOC to RRI_NOx showed negative values in majority of the cities; therefore, collaborative VOCs emission reduction is necessary to suppress the deterioration of O3 volume fraction. The absolute value of this ratio was much lower in cities with high industrialization and urbanization than in ordinary small and medium-sized cities, implying that the demand for collaborative VOCs emission reduction in these cities will be higher. However, even under 50% reduction of precursors, the improvement in O3 volume fraction was limited in regional cities, and the combined prevention in neighboring cities remains important. |
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