邯郸市冬季一次沙尘、霾和雾接连出现的过程中污染特征解析

Air pollution characteristics analysis of a process with dust,haze and fog appeared successively in Handan during winter

分析了邯郸市2021年1月11—28日沙尘、霾和雾接连出现的过程,通过混合拉格朗日综合轨迹(HYSPLIT)模型模拟不同污染过程下的气流后向轨迹,综合运用聚类分析法、潜在源贡献因子(PSCF)分析法和浓度权重轨迹(CWT)分析法解析了大气污染物的输送扩散和来源。结果表明,1月11—17日为沙尘污染天,首要污染物为可吸入颗粒物(PM_(10));1月18—19日为清洁天;1月20—24、25—28日分别为霾污染天和雾污染天,首要污染物均为细颗粒物(PM_(2.5))。此次污染过程颗粒物是首要污染物,与NO_(2)和O_(3)关系不大。沙尘污染天的气流以西北方向输入为主,污染范围较广,受来自蒙古、中国内蒙古自治区等西北地区的冷空气影响尤为明显。霾污染天的气流主要是来自邯郸市周边的短气流,主要沿山西省中部和河北省中南部呈直线分布。雾污染天的气流也主要来自邯郸市周边,以山西省南部为主。

A process with dust,haze and fog appeared successively in Handan from January 11th to 28th,2021 were analyzed.The backward trajectories in different pollution stages were investigated by the hybrid single particle Lagrangian integrated trajectory(HYSPLIT)model.The cluster method,the potential source contribution function(PSCF)method and the concentration weighted trajectory(CWT)method were applied to study the transportation and source of air pollutants.Results showed that that January 11th to 17th was dust stage with priority pollutant of PM_(10),January 18th to 19th was clean stage,January 20th to 24th and 25th to 28th were haze stage and fog stage both with priority pollutant of PM_(2.5),respectively.Obviously,particulate matter was always priority pollutant during this episode,but NO_(2)and O_(3)showed little relationship with this episode.The dust stage was mainly controlled by northwestern cold air from areas like Mongolia and Inner Mongolia of China and spread widely.The haze stage was mainly controlled by short distance air from the surrounding areas of Handan,linearly distributed along central Shanxi and central and southern Hebei.The fog stage was also controlled by short distance air from the surrounding areas of Handan,but mainly from southern Shanxi.