军运会期间武汉东南传输通道PM_(2.5)中水溶性离子区域传输解析  

Regional transport analysis of water-soluble ions in PM_(2.5) in the southeast transmission channel of Wuhan during the military game

作　　者：刘威杰 李淼 张慧迪 张丽 汪昂绿 姚萱 鞠定国 邢新丽 张家泉[1] 祁士华 LIU Weijie;LI Miao;ZHANG Huidi;ZHANG Li;WANG Anglyu;YAO Xuan;JU Dingguo;XING Xinli;ZHANG Jiaquan;QI Shihua(School of Environmental Science and Engineering,Hubei Pol ytechnic University,Huangshi 435003,China;School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430078,China)

机构地区：[1]湖北理工学院环境科学与工程学院,湖北黄石435003 [2]中国地质大学(武汉)环境学院,湖北武汉430078 [3]中国地质大学(武汉)生物地质与环境地质国家重点实验室,湖北武汉430078

出　　处：《安全与环境工程》2024年第3期281-290,共10页Safety and Environmental Engineering

基　　金：国家重点研发计划项目(2017YFC0212602);中央引导地方科技发展资金项目(2022BGE252);湖北省技术创新计划重点研发专项项目(2023BCB142)。

摘　　要：2019年10月武汉市举办第七届世界军人运动会。为探究军运会期间武汉市和黄石市两地的大气细颗粒物浓度特征、污染源差异及区域传送情况,于2019年10月10日至2019年11月5日对武汉和黄石两站点的大气细颗粒物进行了连续观测,并分析了PM_(2.5)中水溶性离子的浓度特征,通过后向气团运动轨迹结合潜在源贡献因子(PSCF)和浓度权重轨迹(CWT)分析方法探究了两站点的污染物区域传送。结果表明:本次观测期间武汉站点和黄石站点的PM_(2.5)浓度超过《环境空气质量标准》(GB 3095—2012)日均二级限值(75μg/m^(3))的超标率分别为26.1%和17.4%,时间主要处于军运会结束后;武汉和黄石两站点PM_(2.5)中的水溶性离子主要以NO-_(3)、SO_(4)^(2-)和NH~+_(4)为主;黄石站点CE/AE值的拟合曲线斜率小于1,表明颗粒物表面呈弱酸性,而武汉站点CE/AE值的拟合曲线斜率大于1,表明颗粒物表面呈中性或弱碱性;两地PM_(2.5)中水溶性离子的存在形式主要以NH_(4)HSO_(4)或(NH_(4))_2SO_(4)为主,武汉站点的缺氨样品的占比为30.4%,而黄石站点的缺氨样品的占比为43.5%;主成分分析结果表明,两站点污染源相同,以二次污染源、扬尘源和生物质燃烧源为主;PSCF和CWT分析结果表明,黄石是武汉站点PM_(2.5)的主要潜在源区,WPSCF因子大于0.7,且浓度贡献权重超过45μg/m^(3),而黄石站点的主要潜在源区位于湖北省与安徽省交界处和安徽省安庆市内。Environmental Geology,China University of Geosciences(Wuhan);The 7th world military game was held in Wuhan,in October 2019.PM_(2.5)samples were collected in Wuhan and Huangshi from October 10,2019 to November 5,2019,for investigating the concentration cha-racteristics and regional transmission of atmospheric fine particles during the world military game.And the concentration characteristics of water-soluble ions(WSIs)in PM_(2.5) were analyzed.Potential source contribution factor(PSCF)and concentration weighted trajectory(CWT)through the backward trajectory of air mass were applied to studying the regional transmission of pollutants between the two stations.The results demonstrate that the PM_(2.5) concentration of 21.7%(Wuhan)and 17.4%(Huangshi)samples exceed 75μg/m^(3),which is the second limit value of 24-hour average concentration in the China's National Ambient Air Quality Standards(GB 3095—2012).In addition,NO^(-)_(3)、SO_(4)^(2-),and NH^(+)_(4) are the main components of the WSIs in PM_(2.5).The fitting curve rate of CE/AE ratio at Huangshi station is lower than 1,indicating that PM_(2.5) are weakly acidic,while the fitting curve slope of CE/AE ratio at Wuhan station is greater than 1,indicating that the PM_(2.5)are neutral or weakly alkaline.The main forms of WSIs in PM_(2.5) are NH_(4)HSO_(4) or(NH_(4))_(2)SO_(4) for two sites.The proportion of ammonia deficient samples at Wuhan site is 30.4%,while the proportion at Huangshi site is 43.5%.The results of principal component analysis(PCA)indicate that the pollution sources at the two sites are consistent,with secondary pollution sources,dust sources,and biomass combustion sources as the main sources.The results of PSCF and CWT analysis reveal that Huangshi is the main potential source area of PM_(2.5) at Wuhan station.The results of PSCF and CWT analysis revealed that Huangshi is the main source area of PM_(2.5) at Wuhan station,with the WPSCF factor greater than 0.7 and a concentration contribution weight exceeding 45μg/m^(3).The main potential source

关 键 词：PM_(2.5) 水溶性离子 区域传输 潜在源贡献因子 浓度权重轨迹 武汉市 黄石市 

分 类 号：X823[环境科学与工程—环境工程]