2013—2017年邯郸市PM_(2.5)浓度变化特征及污染源区研究

Analysis of PM_(2.5) concentration changes and pollution source areas in Handan city during 2013—2017

为探索邯郸地区PM_(2.5)浓度长期变化特征及污染潜在源区,对邯郸2012年12月—2018年2月河北工程大学站点在线监测的PM_(2.5)质量浓度进行统计分析,并结合HYSPLIT模型、潜在源贡献因子法(PSCF)和浓度权重轨迹分析法(CWT)对PM_(2.5)进行来源解析。结果表明:邯郸市2013—2017年PM_(2.5)年均值为108.4、98.3、92.2、81.2、66.3μg·m-3;整体呈逐年下降趋势;秋冬季污染最为严重,春、夏季次之;月均值呈单峰型分布,1月最高(167.4μg·m-3),7月最低(59.2μg·m-3)。后向轨迹结果显示,近地层大气污染气团输送路径以近距离轨迹为主,轨迹较短的路径占比在40%以上。除冬季外,近距离输送路径均存在螺旋转向,轨迹方向转为南向和东向路径;邯郸主要污染源区范围较大,其中河北中南部、河南北部、山西中南部、陕西北部、内蒙古南部地区的轨迹对邯郸PM_(2.5)质量浓度贡献较大。

In order to explore the long-term variation characteristics of PM2.5concentrations in Handan and their potential source of pollution,the statistical analysis of the PM2.5concentrations obtained from online monitoring of Hebei University of Engineering site from December2012to February2018was carried out.Source analysis of PM2.5was performed by HYSPLIT model,potential source contribution factor method(PSCF)and concentration weight trajectory analysis(CWT).The results show that the average annual values of PM2.5in Handan city from2013to2017are108.4,98.3,92.2,81.2,66.3μg.m^-3,respectively.The trend is declining year by year;the pollution is more serious in autumn and winter,followed by spring and summer;the monthly mean value of PM2.5is unimodal,and the highest in January(167.4μg.m^-3),The lowest value appears in July(59.2μg.m^-3).The results of the backward trajectory show that the near-surface air pollution air mass transport path is dominated by close-range trajectories,and the path with shorter trajectories accounts for more than40%.In addition to winter,there are spiral turns in the short-distance transport path,and the trajectory direction turns to the south-direction and east-direction paths.The main pollution source areas are large,and trajectories from central central and southern Hebei,northern Henan,south-central Shanxi,north Shaanxi,and southern Inner Mongolia contribute a lot to the mass concentration of PM2.5.