广西十万大山背景点PM_(2.5)中非极性有机气溶胶组成及来源解析  

Organic Aerosols and Source Analysis of Fine Particles in the Background of Shiwanda Mountain,Guangxi

作　　者：邢佳莉 曹芳 王谦[1,2,3] 张煜娴 章炎麟 XING Jia-li;CAO Fang;WANG Qian;ZHANG Yu-xian;ZHANG Yan-lin(International Joint Laboratory on Climate and Environment Change(ILCEC),Yale-NUIST Center on Atmospheric Environment,School of Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science&Technology,Nanjing 210044,China;Jiangsu Key Laboratory of Agricultural Meteorology,College of Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学应用气象学院,耶鲁大学-南京信息工程大学大气环境中心,气候与环境变化国际合作联合实验室,南京210044 [2]南京信息工程大学气象灾害预报预警与评估协同创新中心,气象灾害教育部重点实验室,南京210044 [3]江苏省农业气象重点实验室,南京信息工程大学应用气象学院,南京210044

出　　处：《环境科学》2022年第6期2895-2905,共11页Environmental Science

基　　金：国家自然科学基金项目(41977185,41977305,41761144056);江苏省双创团队;江苏省杰出青年基金项目(BK20180040)。

摘　　要：大气细颗粒物(PM_(2.5))中的非极性化合物包括多环芳烃(PAHs)和正构烷烃(n-alkanes)等,通常用于识别污染来源,且对人体健康和环境有很重要的影响.为探究广西背景点PM_(2.5)中非极性有机气溶胶的污染特征及来源,于2017年11月至2018年10月,对野外采集的PM_(2.5)样品分析了其中17种多环芳烃和20种正构烷烃.结果表明,多环芳烃和正构烷烃全年的平均值分别为(4.28±4.25)ng·m^(-3)和(13.7±14.72)ng·m^(-3);季节变化规律均是:冬季[(7.86±5.19)ng·m^(-3)和(27.51±16.9)ng·m^(-3)]>春季[(2.73±1.76)ng·m^(-3)和(7.64±4.71)ng·m^(-3)]>秋季[(2.34±1.45)ng·m^(-3)和(7.01±4.55)ng·m^(-3)]>夏季[(1.91±1.67)ng·m^(-3)和(3.98±3.12)ng·m^(-3)].PAHs中5环和6环的分子占比较大,超过60%,其次是中低环分子(4环和3环);n-alkanes中高分子量占比较高(C29>C31>C27),且奇偶碳数有明显差异.另外结合特征比值法、主成分分析法和后向轨迹相互验证发现:冬季非极性有机气溶胶中41.5%受港口船舶交通排放、海洋源输送影响,36.7%的污染贡献来自燃煤和局地生物质燃烧;春季污染气团中有25.2%来自生物质燃烧传输影响,45.0%来自研究区域南部的海洋输送,高等植物蜡排放污染较高;夏季53.4%气团污染来自船舶交通源传输,10.6%的污染来自西南泰国的跨境输送.广西背景点有机气溶胶受到局地排放和传输源的共同影响.The non-polar compounds in atmospheric fine particles(PM^(2.5))mainly include polycyclic aromatic hydrocarbons(PAHs)and normal alkanes(n-alkanes),etc.,which are usually used to identify the source of the air pollution and have a great important impact on human health and the environment.To study the pollution characteristics and sources of non-polar organic aerosols in the background point PM_(2.5)in Guangxi,from November 2017 to October 2018,17 types of PAHs and 20 types of n-alkanes were analyzed on PM_(2.5)samples collected in the field.It was found that the annual average concentrations of PAHs and n-alkanes were 4.28±4.25 ng·m^(-3)and 13.7±14.72 ng·m^(-3),respectively.The seasonal change was as follows:winter[(7.86±5.19)ng·m^(-3),(27.51±16.90)ng·m^(-3)]>spring[(2.73±1.76)ng·m^(-3),(7.64±4.71)ng·m^(-3)]>autumn[(2.34±145)ng·m^(-3),(7.01±4.55)ng·m^(-3)]>summer[(1.91±1.67)ng·m^(-3),(3.98±3.12)ng·m^(-3)].In PAHs,5-ring and 6-ring molecules accounted for more than 60%,followed by low-and medium-ring molecules(4-ring and 3-ring).The high molecular weight of n-alkanes was relatively high(C29>C31>C27),and the odd and even carbon numbers were significantly different.In addition,combined with the feature ratio method,principal component analysis method,and backward trajectory joint verification,it was found that 41.5%of non-organic aerosols in winter were affected by maritime traffic emissions and ocean source transportation,and 36.7%of the pollution was explained by the coal burning and local biomass burning;25.2%of the pollution in spring came from biomass combustion and transportation,and 45.0%was attributed to marine transportation in the southern part of the study area and higher plant wax emissions pollution;53.4%of pollution in summer came from polluted ship emissions,and 10.6%of pollution came from transportation in Southwest Thailand Source transportation.The organic aerosols at the background sites in Guangxi were affected by the combined effects of local emissions and transmission sources

关 键 词：非极性化合物 多环芳烃(PAHs) 正构烷烃(n-alkanes) 后向轨迹分析 主成分分析 

分 类 号：X513[环境科学与工程—环境工程]