淄博市2016-2019年近地面大气臭氧时空分布特征

为认识淄博市近年来大气臭氧（O₃）时空分布特征，基于山东省淄博市19个环境空气质量监测点2016-2019年近地面O₃的连续观测数据，运用Pearson相关性分析法、反距离权重法等方法开展研究.结果表明:①淄博市2016-2019年ρ（O_{3-8 h}）（O_{3-8 h}为O₃日最大8 h浓度）第90百分位数范围为184~203 μg/m3，是GB 3095-2012《环境空气质量标准》二级标准限值（160 μg/m3）的1.15~1.27倍.②ρ（O_{3-8 h}）季节性变化呈夏季（155 μg/m3）>春季（129 μg/m3）>秋季（104 μg/m3）>冬季（60 μg/m3）的特征；ρ（O_{3-8 h}）月变化呈双峰型，峰值分别出现在6月（186 μg/m3）和9月（147 μg/m3）；ρ（O_{3-8 h}）日变化呈单峰型，峰值（117 μg/m3）出现在14:00左右.③ρ（O_{3-8 h}）空间分布呈南北低、中间高的特点，并具有区域均匀性发展趋势.④CO、NO、NO₂和NO_x等前体物浓度均与ρ（O_{3-8 h}）呈负相关，但在夏季相关性较差；冬季夜晚局地污染物对O_x的贡献大于白天.⑤ρ（O_{3-8 h}）与温度和风速均呈显著正相关，与相对湿度呈显著负相关，当风向为西南风时ρ（O_{3-8 h}）较高.研究显示，淄博市O₃表现为典型的光化学生成特征，2016-2019年O₃污染总体呈加重趋势. 

Spatial-Temporal Characteristics of Ground Ozone in Zibo City from 2016 to 2019

Based on continuous observation data of near-surface ozone from 19 ambient air quality monitoring stations in Zibo City, Shandong Province from 2016 to 2019, the spatial-temporal characteristics of atmospheric O₃ were studied using Pearson correlation analysis and inverse distance weighting method. The results showed that: (1) From 2016 to 2019, the 90th percentile of ρ(O_{3-8 h}) (maximum 8 h concentration on O₃ day) in Zibo City was 184-203 μg/m3, which is 1.15-1.27 times of the limit value of level Ⅱ (160 μg/m3) in National Ambient Air Quality Standards (GB 3095-2012). (2) The seasonal average of ρ(O_{3-8 h}) was characterized by summer (155 μg/m3) > spring (129 μg/m3) > autumn (104 μg/m3) > winter (60 μg/m3). The monthly variation of ρ(O_{3-8 h}) showed 'double peak' pattern, peaking in June (186 μg/m3) and September (147 μg/m3), respectively. The diurnal variations of O₃ showed a 'single peak' pattern, with the peak value of 117 μg/m3 at around 14:00. (3) The spatial distribution of ρ(O_{3-8 h}) showed 'low in south-north area and high in middle area' pattern, with a uniform trend in the regional. (4) The variation of precursors such as CO, NO, NO₂ and NO_x were negatively correlated with ρ(O_{3-8 h}), but this correlation was weak in summer. Local pollutants at night in winter contributed more to O_x than in daytime. (5) ρ(O_{3-8 h})was significantly positively correlated with temperature and wind speed, and negatively correlated with humidity. High ρ(O_{3-8 h}) was observed under southwesterly dominated wind. The results showed typical photochemical characteristics of O₃ in Zibo, and O₃ pollution gradually increased from 2016 to 2019.