天津郊区春季大气新粒子生成特征及影响因素分析  

Studies on the characteristics and influencing factors of spring atmospheric new particle formation in Tianjin suburbs

作　　者：刘佳媛 彭剑飞 张进生 国纪良 宋爱楠 史国良[1] 吴建会[1] 毕晓辉[1] 吴琳[1] 王婷[1] 冯银厂[1] 毛洪钧[1] LIU Jiayuan;PENG Jianfei;ZHANG Jinsheng;GUO Jiliang;SONG Ainan;SHI Guoliang;WU Jianhui;BI Xiaohui;WU Lin;WANG Ting;FENG Yinchang;MAO Hongjun(Tianjin Key Laboratory of Urban Transport Emission Research,State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control,College of Environmental Science and Engineering,Nankai University,Tianjin 300071)

机构地区：[1]南开大学环境科学与工程学院,天津市城市交通污染防治研究重点实验室,国家环境保护城市空气颗粒物污染防治重点实验室,天津300071

出　　处：《环境科学学报》2024年第10期10-20,共11页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划项目(No.2022YFE0135000);国家自然科学基金面上项目(No.42175123);天津市自然科学基金项目(No.20JCYBJC01270)。

摘　　要：新粒子生成(NPF)对空气质量、区域和全球气候以及人体健康产生重大影响.为揭示京津冀地区沿海城市NPF特征及影响因素,于2023年春季在天津郊区站点实测了3~1000 nm大气颗粒物的数浓度粒径分布.观测期间,颗粒物数浓度的平均值为(1.6×10^(4)±9.5×10^(3))cm^(-3),数谱分布呈现以核模态和爱根核模态为主的特征,二者占总颗粒物数浓度的81.6%.NPF发生频率约为37%,新粒子生成速率和增长速率范围分别为2.96~12.34 cm^(-3)·s^(-1)、2.2~7.1 nm·h^(-1),生成粒径主要分布在3~25 nm.NPF事件主要出现在较清洁的大气条件下,气态H2SO4和NH3是天津NPF过程中的重要物种.此外,高温、低湿、强太阳辐射等气象条件更有利于NPF事件的发生.后向轨迹结果显示,NPF天气团主要来自长三角和天津西北部地区,而来自海洋方向的气团不利于NPF发生.New particle formation(NPF)has significant impacts on air quality,regional and global climate,and human health.To reveal the characteristics and influencing factors of NPF in coastal cities in Beijing-Tianjin-Hebei region,the number concentration and size distribution of atmospheric particles from 3nm to 1000nm were measured at a suburban station in Tianjin in the spring of 2023.During the observation period,the average particle number concentration was(1.6×10^(4)±9.5×10^(3))cm^(-3),characterized mainly by the nucleation mode and Aitken nuclear mode,which together accounted for 81.6%of the total number concentration.The occurrence frequency of NPF was about 37%,and the formation rate and growth rate of particles were in the ranges of 2.96~12.34 cm^(-3)·s^(-1)and 2.2~7.1 nm·h^(−1),respectively.The formation particle size was mainly distributed in 3~25 nm.NPF events generally occurred under relatively clean atmospheric conditions,and gaseous H2SO4 and NH3 were important species in the NPF process in Tianjin.In addition,meteorological conditions such as high temperature,low humidity,and strong solar radiation were more conducive to NPF events.The backward trajectory results indicated that the air masses on NPF days mainly originated from the Yangtze River Delta region and the northwest of Tianjin,while the air masses from the marine direction were unfavorable for NPF events.

关 键 词：沿海地区 新粒子生成 颗粒物数浓度 粒径分布 气态前体物 

分 类 号：X51[环境科学与工程—环境工程]