基于Brute-Force方法的京津冀区域夏季臭氧反应机制  

Summer Ozone Mechanism and Control Strategy in Beijing-Tianjin-Hebei Region Using Brute-Force Method

作　　者：李睿[1] 魏巍[1,2] 王兴锋 王晓琦[1,2] 程水源[1,2] LI Rui;WEI Wei;WANG Xing-feng;WANG Xiao-qi;CHENG Shui-yuan(Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学环境与生命学部,北京100124 [2]北京工业大学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》2023年第10期5400-5409,共10页Environmental Science

基　　金：国家自然科学基金项目(51978010,52022005)。

摘　　要：近年来京津冀区域夏季臭氧(O_(3))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O_(3)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O_(3)变化.O_(3)在不同排放情景的变化表明,该区域O_(3)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O_(3)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NO_(x),RRI_NO_(x)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_NO_(x)值越低,暗示RRI_NO_(x)对当地NO_(2)浓度的负向依赖;但RRI_VOC与NO_(2)水平无明显关联,更依赖于对前体物相对丰度(VOCs:NO_(x)).RRI_VOC与RRI_NO_(x)比值在多数城市表现为负值,VOCs协同减排以抑制O_(3)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O_(3)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.In recent years,the ozone(O_(3))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 O_(3)volume fraction to precursor emissions in urban areas had large spatial variability,with RRI_VOC and RRI_NO_(x)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_NO_(x)values in urban areas with high intensity of precursor emissions implied a negative dependence of RRI_NO_(x)on local NO_(2)concentrations;however,RRI_VOC was not significantly correlated with NO_(2)levels and was more dependent on the relative abundance of precursors(VOCs:NO_(x)).The ratio of RRI_VOC to RRI_NO_(x)showed negative values in majority of the cities;therefore,collaborative VOCs emission reduction is necessary to suppress the deterioration of O_(3)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 O_(3)volume fraction was limited in regional cities,and the combined prevention in neighboring cities remains important.

关 键 词：京津冀区域 臭氧(O_(3)) 前体物响应 敏感区 WRF-Chem模式 

分 类 号：X515[环境科学与工程—环境工程]