• 关键词：大气颗粒物  潜在源  后向轨迹  聚类分析  季节变化

• 基金项目：安徽省留学归国人员创新创业扶持计划项目；安徽省大学生创新创业训练计划项目（No.S201910360314）

• 牛司平
• 安徽工业大学能源与环境学院环境科学与工程系，马鞍山 243002

• 朱旭
• 安徽工业大学能源与环境学院环境科学与工程系，马鞍山 243002

• 朱兰兰
• 安徽工业大学能源与环境学院环境科学与工程系，马鞍山 243002

• 张源源
• 安徽工业大学能源与环境学院环境科学与工程系，马鞍山 243002

• 摘要：利用2018年3月—2021年2月环境和气象数据对皖南地区铜陵市大气颗粒物的污染特征和潜在贡献源进行了系统性研究.铜陵市大气颗粒物污染具有明显的季节变化特征，冬季污染物浓度最高，PM_2.5和PM₁₀平均为（60.3±31.0） μg·m^-3和（89.2±42.2） μg·m^-3.计算发现PM_2.5/PM₁₀超过0.5，铜陵市的大气颗粒物污染问题与细颗粒物关系密切.后向轨迹聚类分析表明铜陵市大气颗粒物的输送路径具有季节性差异.春季以西北、东北和西南方向气流为主，占比83.73%；夏季以东南和南部方向气流为主，占比82.90%；秋季以东北气流为主，占比51.00%；冬季则是以北方和西北气流为主，占比69.81%.其中，冬季气流轨迹所对应的PM_2.5和PM₁₀的浓度最高，平均为59.7和92.0 μg·m^-3；夏季最低，平均为23.8和43.8 μg·m^-3.潜在源贡献因子（WPSCF）和浓度权重轨迹（WCWT）的分析结果表明冬季大气颗粒物的潜在贡献源区范围最广且贡献能力最强，夏季潜在源区范围最小、贡献能力最弱.冬季铜陵市大气颗粒物潜在贡献源主要位于安徽省、江苏省、浙江省和江西省.

• Abstract：Based on the environmental and meteorological data from March 2018 to February 2021， the pollution and potential contribution sources of atmospheric particulate matter in Tongling City， Southern Anhui Province， was investigated. Air pollution of Tongling by particulate matter had seasonal variation， wherein， the highest concentration occurred in winter with average concentration as （60.3±31.0） μg·m^-3 for PM_2.5 and （89.2±42.2） μg·m^-3 for PM₁₀. PM_2.5/PM₁₀ was calculated as over 0.5， indicating that the air pollution by particulate matter in Tongling City was mainly attributed to the fine particles. Back trajectory cluster analysis shows the transportation path of atmospheric particles in Tongling City changed seasonally. The northwest， northeast and southwest air flows were the dominant in spring accounting for 83.73%， the southeastern and southern in summer accounting for 82.90%， the northeast in autumn accounting for 51.00%， and the north and northwest in winter accounting for 69.81%， respectively. Moreover， the trajectory had the highest concentrations of PM_2.5 and PM₁₀ in winter with averages of 59.7 and 92.0 μg·m^-3 while the lowest in summer as 23.8 and 43.8 μg·m^-3. Potential source contribution factor （PSCF） and concentration weighted trajectory （CWT） suggest the main potential source area in winter was the widest and largest while the smallest and weakest in summer. In winter the atmospheric particulate concentration in Tongling City was mainly affected by the potential sources located in Anhui Province， Jiangsu Province， Zhejiang Province and Jiangxi Province.

• Key words：atmospheric particulate matter  potential contributor  backward trajectory  cluster analysis  seasonal variation

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