气象与环境学报2025，Vol.41Issue(2)：74-80,7.DOI:10.3969/j.issn.1673-503X.2025.02.009
2022年1月21-24日北京市一次气溶胶污染过程城区站与郊区站污染特征对比分析
Comparative analysis of pollution characteristics between urban and suburban stations during an aerosol pollution episode in Beijing from January 21 to 24,2022
摘要
Abstract
This study comparatively analyzes PM2.5 mass concentration and surface meteorological conditions be-tween an urban site(Nanjiao Station)and a suburban site(Shangdianzi Station)during an aerosol pollution epi-sode in Beijing from January 21 to 24,2022.The causes of this episode were investigated using vertical extinction coefficients,radiosonde meteorological data,and backward trajectories.Results show that the average PM2.5 mass concentration at the urban station during the pollution period was 118.5 μg·m-3,with significantly higher concen-tration levels and longer duration than that at the suburban station.Aerosol transport was observed above the urban station,with high aerosol extinction coefficient areas subsiding toward the surface,resulting in increased ground-level aerosol concentrations.The pollution episode began under southerly winds,transporting aerosol pollutants from southern Beijing toward Nanjiao Station.The pollution was exacerbated by a combination of meteorological conditions including decreased near-surface wind speed,increased relative humidity,and the formation and down-ward movement of temperature inversion layers.During the pollution episode,wind speeds at the urban station were notably lower than those at the suburban station,resulting in poorer dispersion conditions.Under relatively stable emission sources,variations in meteorological conditions during the pollution period served as good indica-tors of pollution.关键词
消光系数/探空气象要素/后向轨迹/逆温Key words
Aerosol extinction coefficient/Radiosonde meteorological elements/Backward trajectory/Tempera-ture inversion分类
环境科学引用本文复制引用
贾小芳,李杨,孙晓晴,步志超,荆俊山,郭伟,胡树贞..2022年1月21-24日北京市一次气溶胶污染过程城区站与郊区站污染特征对比分析[J].气象与环境学报,2025,41(2):74-80,7.基金项目
国家自然科学基金面上项目(42175189)资助. （42175189）
