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北京市臭氧污染特征及影响因素分析
Characteristics and influencing factors of ozone pollution in Beijing
【摘要】 本研究基于2023年7月21日—8月21日北京市气象监测资料、北京市生态环境局33个大气监测站点的臭氧(O3)数据,分析研究期间北京市O3污染特征,并讨论O3生成的影响因素。结果表明:研究期间,北京市城区的O3浓度较高,污染持续时间更长,而郊区相对浓度较低;O3污染过程中,O3浓度与NO2浓度变化的相关系数为负值;当环境温度介于29~32℃、相对湿度介于25%~60%时,O3超标概率会大幅升高;随着日最高温度增加,O3浓度水平的升高趋势逐渐减慢,O3浓度与日最高辐射量呈现显著的正相关关系。距地面越高,后向轨迹气团的传输距离越长,在100 m、500 m和1 000 m高度上,北京市O3污染物的主要传输方向来自京津冀南部和东南部。
【Abstract】 This study utilizes meteorological monitoring data collected from July 21 to August 21,2023,in Beijing,alongside ozone (O3)data from 33 atmospheric monitoring stations managed by the Beijing Environmental Protection and Ecological Environment Bureau.It examines the characteristics of O3 pollution in Beijing during this period and discusses the influencing factors of O3 generation.The results indicated that during the study period,O3 concentrations in Beijing’s urban areas were higher with longer durations of pollution,whereas suburban concentrations were comparatively lower;Throughout the O3pollution episodes,variations in O3 concentration negatively correlated with NO2 concentration;The probability of O3 exceeding acceptable standards significantly increases when the ambient temperature ranges from 29℃to 32℃and the relative humidity ranges from 25%to 60%;As the daily maximum temperature rises,the increasing trend of O3 concentration levels gradually decelerates,and a significant positive correlation is observed between O3concentration and daily maximum radiation.The higher above ground,the greater the transport distance of the air mass following a backward trajectory.At heights of 100 m,500 m,and 1 000 m,the primary source of O3 pollutants in Beijing is from the southern and southeastern parts of the Beijing-Tianjin-Hebei region.
【Key words】 Ozone pollution; meteorological elements; PCA; backward trajectory;
- 【文献出处】 环境生态学 ,Environmental Ecology , 编辑部邮箱 ,2025年01期
- 【分类号】X515
- 【下载频次】105