邯郸市PM_(2.5)和O_(3)污染特征及潜在源分析

Analysis of characteristics and potential sources of PM_(2.5)and O_(3)pollution in Handan

通过对2013—2020年邯郸市的大气污染物浓度及气象参数进行统计分析,探究了大气污染物的浓度变化特征,运用轨迹聚类分析和潜在源贡献因子法(PSCF)研究了邯郸市复合污染日PM_(2.5)和O_(3)的传输路径及潜在源区.结果表明:邯郸市PM_(2.5)-O_(3)复合污染出现在3—10月,与单O_(3)污染相比,PM_(2.5)-O_(3)复合污染时的O_(3)峰值浓度和平均浓度较高,当温度为19.1~25.7℃,湿度为32%~63%,风速较低时,最有利于PM_(2.5)-O_(3)复合污染发生;单O_(3)污染和复合污染期间的O_(3)主要来自邯郸周围的短距离传输,单PM_(2.5)污染主要来自西北气流的长距离运输和邯郸周围的短距离传输,而复合污染日期间的PM_(2.5)主要来自西北气流的长距离运输;相较于单O_(3)污染,2013、2014、2015年复合污染中O_(3)的WPSCF值较高,2015年潜在源区呈离散分布,2016—2020年WPSCF值降低,潜在源区区域整体减少;与单PM_(2.5)污染相比,2013、2014年复合污染中PM_(2.5)的WPSCF值较高,潜在源区多,2015—2020年WPSCF值有所降低,潜在源区区域整体减少.

The statistical analysis of air pollutant concentrations and meteorological parameters in Handan from 2013 to 2020 was used to explore the characteristics of the concentration changes of air pollutants,and the transport paths and potential source of PM_(2.5)-O_(3)complex pollution in Handan were investigated using trajectory cluster analysis and potential source contribution factor method(PSCF).The results showed that the PM_(2.5)-O_(3)composite pollution during the PM_(2.5)-O_(3)composite pollution compared with the single O_(3)pollution,when the temperature was 19.1~25.7℃,the humidity was 32%~63%and the wind speed was low,which was most conducive to the occurrence of the PM_(2.5)-O_(3)composite pollution;the single O_(3)pollution and O_(3)during the complex pollution mainly from short-range transport around Handan,single PM_(2.5)pollution mainly from long-range transport of northwest airflow and short-range transport around Handan,and PM_(2.5)during complex pollution days mainly from long-range transport of northwest airflow;compared to single O_(3)pollution,the WPSCF values of O_(3)in complex pollution were higher in 2013,2014 and 2015,and the potential source areas in 2015 was discrete and the WPSCF values decreased in 2016—2020,with an overall decrease in potential source area areas;compared to single PM_(2.5)pollution,the WPSCF values for PM_(2.5)were higher in 2013 and 2014 in the complex pollution,with more potential source areas,and the WPSCF values decreased in 2015—2020,with an overall decrease in potential source area areas.