成都平原经济区冬季细颗粒物的区域输送及潜在来源研究

Regional transport and potential sources of fine particulate matter in the Chengdu Plain Economic Zone in winter

基于2016年3月至2021年2月环境空气质量监测数据,分析了成都平原经济区(包括成都、绵阳、德阳、遂宁、乐山、资阳、雅安、眉山)8个城市细颗粒物(PM_(2.5))污染特征,发现冬季PM_(2.5)污染程度最为严重,PM_(2.5)污染程度较高的成都、德阳、乐山发生轻度及以上污染频率达到45.23%、44.34%、43.90%。8个城市的PM_(2.5)与SO_(2)、NO_(2)、CO、可吸入颗粒物(PM_(10))都呈正相关性(P<0.01),与PM_(10)的相关性极强(相关系数在0.8以上)。对研究区域PM_(2.5)浓度和48 h后向轨迹进行计算和聚类,并利用潜在源贡献分析和浓度权重轨迹分析探讨PM_(2.5)的区域输送路径和潜在贡献来源。结果表明,成都平原经济区8个城市冬季的PM_(2.5)污染气团主要来自其东北方向的短距离输送。

Based on ambient air quality monitoring data from March 2016 to February 2021,this paper analyzed the characteristics of fine particulate matter(PM_(2.5))pollution in 8 cities of the Chengdu Plain Economic Zone(including Chengdu,Mianyang,Deyang,Suining,Leshan,Ziyang,Ya’an and Meishan).It was found that PM_(2.5)pollution was higher in winter than in any other season.Chengdu,Deyang and Leshan with high PM_(2.5)pollution had mild or above pollution frequencies of 45.23%,44.34%and 43.90%,respectively.PM_(2.5)in the 8 cities were positively correlated with SO_(2),NO_(2),CO and PM_(10)(P<0.01).The correlation between PM_(2.5)and PM_(10)were extremely strong(correlation coefficient was above 0.8).The PM_(2.5)concentration and 48 h backward trajectory were calculated and clustered,the potential source contribution function analysis and the concentration weight trajectory analysis were used to explore the transport paths and potential contribution sources of PM_(2.5)pollution.Results showed that the polluted air masses in the 8 cities in winter mainly came from the short distance transportation of the northeast direction.