基于多模式的北京PM_(2.5)组分特征及氧化潜势分析  

Analysis of PM_(2.5)component characteristics and oxidative potential in Beijing based on multi-mode application

作　　者：滑彤昕 刘蕾 温维 刘晓宇 姜博 马欣 刘育松 邓子凡 HUA Tong-xin;LIU Lei;WEN Wei;LIU Xiao-yu;JIANG Bo;MA Xin;LIU Yu-song;DENG Zi-fan(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Chinese Academy of Meteorological Sciences,Beijing 100081,China;Beijing Municipal Research Institute of Eco-Environmental Protection,Beijing 100037,China;CMA Earth System Modeling and Prediction Centre,Beijing 100081,China)

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]中国气象科学研究院,北京100081 [3]北京市生态环境保护研究院,北京100037 [4]中国气象局地球系统数值预报中心,北京100081

出　　处：《中国环境科学》2024年第1期37-47,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(52270097)。

摘　　要：于2019年3、7月在中国气象科学研究院站进行PM_(2.5)样品采集与实验分析,并用正交矩阵因子分析法(PMF)模型进行来源解析,发现交通源(19.10%)、二次组分(19.17%)和扬尘源(18.02%)是采样期间PM_(2.5)污染主要来源.在此基础上以每立方米大气体积的抗坏血酸的消耗速率(OPv)表征PM_(2.5)的氧化潜势.3月北京的OPv值为(210.49±169.00)[pmol/(min·m^(3))],7月则为(313.34±131.84)[(pmol/(min·m^(3))).且OPv与Cu(r=0.801)、As(r=0.742)、SO_(4)^(2-)(r=0.701)等具有很强的相关性.将多元回归结果和WRF-Chem模型结合,构建了新的氧化潜势预测模型,发现OPv和PM_(2.5)浓度的空间特征存在差异,北京市OPv的浓度最大值出现在东南部.PM_(2.5)samples were collected and analyzed at the station of Chinese Academy of Meteorological Sciences(CAMS)in March and July 2019.PMF(Positive Matrix Factorization)model was used for source analysis,demonstrating that traffic sources(19.10%),secondary components(19.17%)and dust sources(18.02%)were the main sources of PM_(2.5)pollution during the sampling period in Beijing.On this basis,the oxidative potential of PM_(2.5)was determined by the consumption rate of ascorbic acid(AA)per cubic meter,referred as OPv.The OPv were(210.49±169.00)[pmol/(min·m^(3))]and(313.34±131.84)[pmol/min·m^(3)]]in March and July,respectively.OPv had a very strong correlation with Cu(r=0.801),As(r=0.742),SO_(4)^(2-)(r=0.701).A new OPv prediction model was constructed by the multiple regression results and the WRF-Chem model.It was found that there were differences in the spatial characteristics of OPv and PM_(2.5)concentrations,and the maximum concentration of OPv in Beijing appeared in the southeast.

关 键 词：PM_(2.5) 正交矩阵因子分析法(PMF) 氧化潜势 多元回归分析 WRF-Chem 数值模拟 

分 类 号：X513[环境科学与工程—环境工程]