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基于静稳累积污染的石嘴山市PM2.5局地源解析
Local Source Apportionment of PM2.5 in Shizuishan City Based on Calm Weather Cumulative Pollution
投稿时间:2022-11-04  修订日期:2023-04-04
DOI:10.19316/j.issn.1002-6002.2024.03.08
中文关键词:  静稳  PM2.5  PMF  局地源
英文关键词:calm weather  PM2.5  PMF  local sources
基金项目:国家重点研发计划项目(2019YFC1804200)
作者单位
陈引 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术重点实验室, 大气环境与装备技术协同创新中心, 江苏 南京 210044 
赵欣* 生态环境部南京环境科学研究所, 江苏 南京 210042 
漆丹 生态环境部南京环境科学研究所, 江苏 南京 210042 
杨帆 生态环境部南京环境科学研究所, 江苏 南京 210042 
陆建刚 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术重点实验室, 大气环境与装备技术协同创新中心, 江苏 南京 210044 
通讯作者:赵欣*  生态环境部南京环境科学研究所, 江苏 南京 210042  
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中文摘要:
      为探究静稳条件下PM2.5局地源累积特征,在石嘴山市的4个不同功能区站点采集PM2.5样品,并测量其水溶性离子、无机元素和含碳组分浓度,利用后向轨迹模型判断潜在源区,分析了静稳期和非静稳期PM2.5组分浓度差异,并采用PMF模型判断静稳期局地源排放特征。结果表明:①观测期间有2次重污染过程是由局地污染物累积引起的;②沙尘源为主要的外来源,冬季非静稳期存在Si、Ca、Fe浓度大幅上升现象(浓度达到15.11、27.03、18.89 μg/m3),水溶性离子易在静稳条件下累积,受采暖影响,NO3-、SO42-在冬季有更大的贡献,NO3-/SO42-的值表明秋季机动车源对PM2.5的贡献较大,冬季燃煤源对PM2.5的贡献较大,OC/EC的值表明局地排放二次有机气溶胶转化效率不强;③静稳条件下受局地源影响,太沙站点S、Mn、SO42-、EC等与工业排放相关的组分浓度最高,沟口站点受机动车源的影响,NO3-浓度最高(22.66 μg/m3),崇岗站点受煤炭加工排放影响,OC浓度远高于其他站点;④ PMF模型解析结果显示,石嘴山市局地源中工业源(47.4%)贡献最大,其次为机动车与扬尘混合源(29.3%)、二次源(15.1%)。
英文摘要:
      In order to explore the accumulation characteristics of PM2.5 local sources under calm weather, PM2.5 samples were collected from four stations located in different functional areas of Shizuishan City,and the concentrations of water-soluble ions, inorganic elements and carbon components were measured. The potential source area was determined by backward trajectory model,the concentration difference of PM2.5 components in calm period and non-calm period was analyzed,and the PMF model was used to judge the characteristics of local source emissions in calm periods. The results showed that:During the observation period,two heavy pollution processes were caused by local pollutant accumulation; Sand-dust source was the main external source,and the concentrations of Si,Ca and Fe increased sharply in the non-calm period in winter,reaching 15. 11,27. 03 and 18. 89 μg/m3 . Water-soluble ions were easy to accumulate under calm weather, and affected by heating, NO3- and SO42- had a greater contribution in winter. NO3-/SO42- analysis showed that the contribution of motor vehicle sources to PM2.5 was greater in autumn,and the contribution of coal sources to PM2.5 was greater in winter. OC/EC showed that the aerosol conversion efficiency of local emission secondary machine was not strong; Under the influence of local source,the concentration of industrial emission related components such as S, Mn, SO42- and EC at Taisha station was the highest; Goukou station affected by motor vehicle source,the NO3- concentration was the highest,which was 22.66 μg/m3; Under the influence of coal processing emission,the OC concentration at Chonggang station was much higher than that at other stations; The analytical results of PMF model showed that among the local sources of Shizuishan City,the industrial source (47.4%) contributed the most,followed by the mixed source of motor vehicles and dust (29.3%) and the secondary source (15. 1%).
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