基于后向轨迹的平潭大气污染输送来源研究

利用全球资料同化系统(GDAS)数据和拉格朗日混合单粒子轨道(HYSPLIT)模式,分析了2016年12月至2017年11月平潭不同季节和O3超标日的气流后向轨迹。结合聚类分析和平潭空气监测数据,分析各季节不同气流类型对污染物浓度的影响,利用潜在源贡献因子(PSCF)法和浓度权重轨迹(CWT)法分析O3污染潜在源区。并以2017年4月28-30日平潭O3污染为例研究O3污染过程。结果表明:影响平潭的气团来源季节差异性较大,受内陆地区气流影响时O3浓度明显高于受海洋型气流影响。平潭O3潜在源区主要集中在江苏、上海,其次为江西及福建内陆。江西中部、福建中北部及沿海地区的污染物外来输送对2017年4月28-30日期间平潭O3污染具有一定的贡献。可见,加强大气污染区域联防联控对O3污染防治具有重要的意义。

Study on the source transportation of air pollution in Pingtan based on backward trajectory

Global data assimilation system(GDAS)and hybrid single particle Lagrangian integrated trajectory(HYSPLIT)model were used to compute the airflow backward trajectories by seasons and O3 episode from December2016 to November 2017.Combined with air monitoring data of Pingtan,clustering analysis were used to analyze the influence of different airflow types on the pollutants concentration in different seasons,and potential contribution areas of O3 were analyzed by potential source contribution function(PSCF)and concentration weighted trajectory(CWT).In addition,the O3 episode that occurred in Pingtan during April 28 th to April 30 th,2017 was studied.The results showed that the air mass sources of Pingtan varied greatly in different seasons,and the O3 concentrations affected by inland airflow were significantly higher than those affected by ocean airflow.The potential source areas were Jiangsu and Shanghai,followed by Jiangxi and inland Fujian.The potential sources for the O3 episode,April 28 th to April30 th,2017,included central Jiangxi,central north and coastal Fujian.It indicated that strengthening regional joint prevention and control of air pollution played a key role in prevention of O3 pollution.