青岛冬夏季PM_(2.5)稳定碳同位素特征及来源解析  

Stable Carbon Isotope Characteristics and Source Apportionment of PM_(2.5) in Winter and Summer in Qingdao

作　　者：王瑶 肖红伟 陶继华[2] 肖扬宁 马艳 李智滔 肖化云 WANG Yao;XIAO Hongwei;TAO Jihua;XIAO Yangning;MA Yan;LI Zhitao;XIAO Huayun(Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution,East China University of Technology,Nanchang 330013,China;School of Geosciences,East China University of Technology,Nanchang 330013,China;School of Environmental Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学江西省大气污染成因与控制重点实验室,江西南昌330013 [2]东华理工大学地球科学学院,江西南昌330013 [3]上海交通大学环境科学与工程学院,上海200240 [4]东华理工大学水资源与环境工程学院,江西南昌330013

出　　处：《环境科学与技术》2023年第6期118-127,共10页Environmental Science & Technology

基　　金：国家自然科学基金资助项目(42063001,41663003);江西省科技计划项目(2017BCD40010);江西省大气污染成因与控制重点实验室开放基金(AE2104)。

摘　　要：青岛是北方重要的港口城市,其大气细颗粒物(PM2.5)受到海陆的双重影响作用,该文为确定青岛市冬夏季PM2.5中总碳(TC)来源及其贡献,分别于2018年1月1日-2月28日(冬季)、2018年7月1日-8月31日(夏季)对青岛地区PM2.5样品进行采集,分析了TC浓度、水溶性离子浓度及其稳定碳同位素值(δ13CTC),并利用贝叶斯混合模型对δ13CTC的不同来源贡献进行计算。研究结果表明,青岛冬夏两季TC浓度分别为(8.6±3.9)μg/m^(3)、(3.9±2.5)μg/m^(3),δ^(13)CTC值分别为(-24.8‰±1.0‰)、(-26.5‰±0.9‰),均表现出明显的季节变化,结合气象数据、水溶性离子和后向轨迹(聚类及PSCF)进行分析,认为可能受到冬季燃煤、夏季生物质燃烧和降雨量的影响。利用贝叶斯混合模型计算,冬季TC主要来源于机动车尾气、煤燃烧,其源贡献占比为63.1%、20.7%;夏季主要来源于机动车尾气、C3植物燃烧,其源贡献占比为63%、33.8%。青岛市TC主要来源可能受到机动车保有量与青岛港货运的影响,其次也受到冬季燃煤和夏季C3植物燃烧的影响。In order to determine the source and contribution of total carbon(TC)in PM2.s in winter and summer in Qingdao,PM2.5 samples were collected from January 1 to February 28,2018(winter)and July 1 to August 31,2018(summer).The concentration of TC,the composition of water-soluble ions,and alongside the composition of stable carbon isotope(8Crc)were measured,also the Bayesian mixture model was used to calculate the contribution of sCrc from different sources.The TC concentrations in winter and summer were(8.6±3.9)μg/m^(3)、(3.9±2.5)μg/m^(3),δ^(13)C_(TC)Crc values were(-24.8%o±1.0%)and(-26.5%o±0.9%o),respectively.The results suggest that an obvious seasonal changes.Combined with of meteorological data,water-soluble ions and backward trajectory analysis,the TC concentrations were affected by meteorological conditions and source changes.Besides,according to the Bayesian mixture model,TC in winter mainly comes from motor vehicle exhaust and coal combustion,which contributed 63.1%and 20.7%respectively to the TC pool.Summer TC was mainly impacted by motor vehicle exhaust and Cs plant combustion,which accounted for 63%and 33.8%of TC pool.The main source of TC may be affected by motor vehicle ownership and freight transportation in Qingdao Port,and secondly by coal burning in winter and C_(3)plant burning in summer.

关 键 词：总碳 贝叶斯模型 稳定碳同位素 PM2.5 青岛 

分 类 号：X513[环境科学与工程—环境工程]