大气和海洋科学快报（英文版）2021，Vol.14Issue(2)：67-73,7.
2014-2017年华北平原PM2.5组分消光与能见度对比研究
Comparative research on visibility and light extinction of PM2.5 components during 2014-17 in the North China plain
摘要
Abstract
Severe air pollution with visibility deterioration has long been a focus in the North China Plain(NCP).In this study,concentration and light extinction analysis of PM2.5 chemical components were carried out from 2014 to 2017 to study the pollution characteristics in Baoding,a case city of the NCP.The annual average con-centration of total PM2.5 components showed a declining trend,decreasing by 11 μg m-3(water-soluble inor-ganic ions),23 μg m-3(carbonaceous aerosols),and 1796 ng m-3(inorganic elements).Contributing 82.9％to the concentration of total ions,the dominant components,NH4+,NO3-,and SO42-became the main pol-lutants in PM2.5 pollution.Based on the IMPROVE algorithm,the average reconstructed PM2.5 mass concen-tration was 93±69 μg m-3 during the observation period.Meanwhile,the light extinction coefficients were 373.8±233.6 M m-1,405.3±300.1 M m-1,554.3±378.2 M m-1 and 1005.2±750.3 M m-1,in spring,summer,autumn,and winter,respectively.Ammonium sulfate,ammonium nitrate,and organic matter were the largest contributors to light extinction,accounting for a total of 55％-77％in the four seasons.The bsca(light scattering by particles and gases)reconstructed from PM2.5 components(Rbsca)and the bsca converted from visi-bility(Vbsca)were compared to evaluate the performance of the IMPROVE algorithm,revealing a high correlation coefficient of 0.84.The high values of Vbsca were underestimated while the low values were overestimated,as determined through comparison with the one-to-ne line.Especially,when Rbsca＞1123 M m-1(corresponding to＜2.0 km,approximately),Vbsca was underestimated by 17.6％.PM2 5 mass concentration and relative humidity also had an impact on the estimation.关键词
PM2.5/化学组分/能见度/IMPROVE 算法/消光Key words
PM2.5/Chemical component/Visibility/IMPROVE algorithm/Light extinction引用本文复制引用
Xinrui Wu,Guangzhou Fan,Yuesi Wang,Lili Wang,Wenkang Gao,Jinyuan Xin,Xiaoling Zhang,Ruirui Si,Guangjing Liu,An'na Li,Tianxue Wen,Zirui Liu,Shigong Wang..2014-2017年华北平原PM2.5组分消光与能见度对比研究[J].大气和海洋科学快报（英文版）,2021,14(2):67-73,7.基金项目
This study was supported by the National Key Research and Devel-opment Program of China[grant number 2016YFC0202001],the Chi-nese Academy of Sciences Strategic Priority Research Program[grant number XDA23020301],the National Natural Science Foundation of China[grant numbers 41375036 and 91644226],and the National Key Research and Development Program of China[grant number 2018YFC0214002]. （）
