基于二次无机气溶胶研究南京冬春季霾污染过程的形成特征和来源解析  

Formation characteristics and source analysis of haze pollution process during winter and spring in Nanjing based on secondary inorganic aerosol

作　　者：姚星灿 康汉青[3] 杜亚宁 郭照冰[1,2] YAO Xingcan;KANG Hanqing;DU Yaning;GUO Zhaobing(School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing,210044,China;Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Nanjing,210044,China;School of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing,210044,China)

机构地区：[1]南京信息工程大学环境科学与工程学院,南京210044 [2]江苏省大气环境监测与污染控制高技术研究重点实验室,南京210044 [3]南京信息工程大学大气物理学院,南京210044

出　　处：《环境化学》2023年第12期4151-4160,共10页Environmental Chemistry

基　　金：国家自然科学基金(41873016,91544228-02,41625006);江苏省“333人才工程”项目;江苏省“青蓝工程项目”资助

摘　　要：为研究南京细颗粒物PM_(2.5)中水溶性无机离子的污染特征、来源及其潜在源区贡献,本文于2015年12月—2016年4月采集PM_(2.5)样品,并测定了8种水溶性无机离子(SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+)、Cl-、K^(+)、Mg^(2+)、Ca^(2+)、Na^(+))的浓度,运用正定矩阵因子(PMF)源解析探究PM_(2.5)来源,结合后向轨迹模型(HYSPLIT)、潜在源区分析法(PSCF)和浓度权重轨迹分析法(CWT),确定了相应组分的潜在污染源区域,并对污染贡献进行定量计算.结果显示,在不同污染水平下,SO_(4)^(2-)、NO_(3)^(-)和NH_(4)^(+)(SNA)均为PM_(2.5)的主要成分,在高相对湿度(RH>50%)和低温(T<8℃)的条件有利于提高二次无机气溶胶的生成速率.PMF源解析发现二次转化源的贡献最显著,其次是扬尘源、生物质燃烧源和海洋源.SNA的潜在源区分布类似,但的CWT峰值超过24μg·m^(−3),且CWT高值区范围较大,这进一步表明在观测期间汽车尾气排放和燃料燃烧是主要的潜在来源.In order to analyze the pollution characteristics,sources and potential contribution of water-soluble inorganic ions in fine particulate matter PM_(2.5)in Nanjing,PM_(2.5)samples were collected from December 2015 to April 2016,and the concentrations of eight water-soluble inorganic ions(SO^(2-)_(4)、NO^(-)_(3)、NH^(+)_(4)、Cl-、K+、Mg^(2+)、Ca^(2+)、Na+)were measured.Positive matrix factorization(PMF)method was used to explore the source of PM_(2.5),combined with Backward trajectory model(HYSPLIT),the potential source contribution function(PSCF)analysis and the concentration weighted trajectory(CWT)analysis,the potential source area of each component was determined,and the pollution contribution was calculated quantitatively.The results showed that under different pollution levels,SO^(2-)_(4)、NO^(-)_(3),and(SNA)were the main components of PM_(2.5),and high relative humidity(RH>50%)and low temperature(T<8℃)were conducive to improving the generation rate of secondary inorganic aerosols.PMF source analysis found that secondary conversion sources contributed the most significantly,followed by dust sources,biomass burning sources and Marine sources.The distribution of potential source regions of SNA is similar,but the peak values of CWT of was over 24μg·m^(−3),and the range of high value of CWT was large,which further indicated that vehicle exhaust emissions and fuel combustion were the main potential sources during the observation period.

关 键 词：细颗粒物PM_(2.5) 水溶性无机离子 二次转化 来源解析 区域传输. 

分 类 号：X513[环境科学与工程—环境工程]