重点臭氧污染区和城市臭氧生成敏感性分析是近地表臭氧(O3)污染防治的重要依据。根据臭氧的五年数据,VOCs,和来自上海三个典型站的NOx,即淀山湖站(郊区),浦东站(市区),利用观测模型对2016-2020年的高臭氧季节臭氧与前体物(VOCs和NOx)之间的非线性关系进行了定量分析。结果表明,2016-2020年上海近地表臭氧峰值为4-9月,6-8月为最高值。VOCs体积分数和NO2浓度对浦东站O3浓度具有较强的指示意义。淀山湖站O3浓度主要受区域环境的影响。气象因素,以及跨区域传播。新联站的臭氧浓度是环境背景浓度和工业区光化学污染的综合。浦东站和淀山湖站位于VOCs控制区。2016年至2019年新联站逐步向NOx控制区靠拢,2020年以来向VOCs控制区过渡。浦东站的L·OH,淀山湖站,新联站分别为:NOx控制区>协同控制区>VOCs控制区。
The sensitivity analysis of ozone generation in key ozone-polluted regions and cities is an important basis for the prevention and control of near-surface ozone (O3) pollution. Based on the five-year data of ozone, VOCs, and NOx from three typical stations in Shanghai, namely Dianshan Lake Station (suburban area), Pudong Station (urban area), and Xinlian Station (industrial area) from 2016 to 2020, the nonlinear relationship between ozone and precursors (VOCs and NOx) during the high-ozone season in the five years was quantitatively analyzed using an observation model. The results showed that the peak months of near-surface ozone in Shanghai were from April to September during 2016 to 2020, with the highest values appearing from June to August. The volume fraction of VOCs and NO2 concentration had a strong indicative significance for the O3 concentration at Pudong Station. The O3 concentration at Dianshan Lake Station was mainly influenced by regional environment, meteorological factors, and cross-regional transmission. The ozone concentration at Xinlian Station was a combination of environmental background concentration and industrial area photochemical pollution. Pudong Station and Dianshan Lake Station were in the VOCs control zone. Xinlian Station was gradually closer to the NOx control zone from 2016 to 2019, transitioning to the VOCs control zone since 2020. The L·OH of Pudong Station, Dianshan Lake Station, and Xinlian Station were: NOx control area>collaborative control area>VOCs control area.