京津冀臭氧变化特征及与气象要素的关系

基于2014~2017年京津冀13座城市的O₃-8h数据，分析O₃时间变化特征及污染状况.在此基础上，结合同期气象数据研究近地层O₃浓度与气象要素的关系.结果表明：2014~2017年京津冀区域O₃-8h整体呈上升趋势，增长率为4.50μg/m³.区域内O₃污染整体加重，北京、保定O₃污染较为严重；2014~2015年O₃浓度与超标情况的月变化主要呈单峰型变化，峰值出现在5月；而2016~2017年为不规则双峰型变化，峰值出现在5~6月和9月.与气象因子的相关性表明：气象要素对O₃的影响具有明显的季节差异，其中春、夏、秋季气温是影响O₃浓度变化的主要因素，而在冬季相对湿度与风速为影响O₃浓度变化的主要因素.此外，分析表明北京、天津、石家庄3大城市夏季形成高浓度O₃的阈值明显不同.

Characteristics of ozone and its relationship with meteorological factors in Beijing-Tianjin-Hebei Region

Based on the O₃-8h data of 13 cities in Beijing-Tianjin-Hebei region from 2014 to 2017, the temporal variation and pollution characteristics of O₃ were analyzed. In addition, the relationship between the O₃ concentration and the meteorological factors was studied by combining with the meteorological data of the same period. O₃-8h in Beijing-Tianjin-Hebei region increased from 2014~2017, with an average annual increase of 4.50μg/m³.O₃ pollution situation in the whole region aggravated, especially in Beijing and Baoding. The monthly O₃ concentration and the over-standard situation mainly presented single-peak variations in 2014~2015, with the maximum in May. However, the irregular double-peak variations were found in 2016~2017,showing one peak value during May to June and the other in September. The correlation between O₃ concentration and meteorological factors indicated that the influence of meteorological factors on O₃ had obvious seasonal differences. In spring, summer and autumn, the temperature was the main factor affecting O₃ concentration, while the relative humidity and wind speed were the main factors in winter. Besides, it is indicted that the thresholds for the formation of high O₃ concentration in Beijing, Tianjin and Shijiazhuang were different in summer.