不同方法判定南京臭氧生成敏感区的差异  

Differences of Three Methods in Determining Ozone Sensitivity in Nanjing

作　　者：陈柑羽 李勋 李琳 秦墨梅 谢鸣捷 王鸣 李婧祎 胡建林 CHEN Gan-yu;LI Xun;LI Lin;QIN Mo-mei;XIE Ming-jie;WANG Ming;LI Jing-yi;HU Jian-lin(Jiangsu Provincial Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Jiangsu Provincial Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,School of Environmental Science and Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学环境科学与工程学院,江苏省大气环境监测与污染控制高技术研究重点实验室,江苏省大气环境与装备技术协同创新中心,南京210044

出　　处：《环境科学》2024年第2期635-644,共10页Environmental Science

基　　金：江苏省自然科学基金项目(BK20200815)。

摘　　要：近年来,我国臭氧(O_(3))污染日益严重,识别O_(3)对前体物挥发性有机化合物(VOCs)和氮氧化物(NO_(x))的敏感性对科学制定区域O_(3)污染防治政策具有重要意义.以南京市2017年7月下旬的一次O_(3)污染事件为例,探讨了基于三维模型的光化学指标法、敏感性系数法以及基于观测的OBM方法在识别南京市O_(3)生成敏感性方面的差异.结果表明,光化学指标法和敏感性系数法得到的南京市O_(3)敏感性的空间分布较为一致(一致性超过50%).其中,敏感性系数法对应的过渡区范围更广,而光化学指标法更倾向于将O_(3)生成判定为只对VOCs或NO_(x)敏感.不过,光化学指标法的结果与采用的临界值有关.OBM方法受观测数据质量影响较大,如NO_(2)观测误差(观测浓度高于实际浓度)会造成OBM低估O_(3)对NO_(x)的敏感性.在判定重污染阶段的O_(3)敏感性时,各方法间差异较大.光化学指标法偏向于VOCs控制,而OBM和敏感性系数法的结果则相对接近,倾向于NO_(x)控制或共同控制.In recent years,ozone(O_(3))has become an increasingly important air pollutant in China.Identifying the sensitivity of O_(3) to the precursors volatile organic compounds(VOCs)and nitrogen oxides(NO_(x))can help make effective abatement strategies.This study compared three methods for determining O_(3)-VOCs-NO_(x) sensitivity:simulated photochemical indicator values and sensitivity coefficients derived from a three-dimensional air quality model and an observation-based model(OBM),with a case study involving an O_(3) pollution event that occurred in Nanjing in late July 2017.The results showed that O_(3) sensitivity based on the photochemical indicator and sensitivity coefficients demonstrated similar spatial variations(over 50% of the grid cells of Nanjing exhibiting identical O_(3) sensitivity).However,sensitivity coefficients identified a larger number of areas within a transitional O_(3) sensitivity regime,as opposed to the VOCs-or NO_(x)-limited regime identified by the photochemical indicator.The determination of the latter was affected by the adopted threshold values.The OBM relied on the quality of the observational data.For example,positive biases in observed NO_(2) could lead to an underestimation of O_(3) sensitivity to NO_(x) with the OBM.During the high pollution period,the three methods exhibited significant disparities.The photochemical indicator tended to suggest the VOCs-limited condition,whereas the OBM and sensitivity coefficients indicated the NO_(x)-limited or transitional regimes.

关 键 词：臭氧(O_(3))敏感性 光化学指标法 敏感性系数法 空气质量模型 基于观测的箱模型(OBM) 

分 类 号：X515[环境科学与工程—环境工程]