Water-soluble brown carbon in atmospheric aerosols from the resource-dependent cities:Optical properties,chemical compositions and sources

作     者：Haoji Wang Yue Su Yangzheng Liu Fei Xie Xingjun Zhou Ruihong Yu Changwei Lü Jiang He Haoji Wang;Yue Su;Yangzheng Liu;Fei Xie;Xingjun Zhou;Ruihong Yu;Changwei Lü;Jiang He

作者机构：School of Ecology and EnvironmentInner Mongolia UniversityHohhot 010021China Institute of Environmental GeologyInner Mongolia UniversityHohhot 010021China Environmental Monitoring Center of Inner MongoliaHohhot 010011China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2024年第138卷第4期

页      面：74-87页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：supported by the Science and Technology Major Project of Natural Science Foundation of Inner Mongolia,China(No.21800-5173909) the Science and Technology Major Project on Air Pollution Prevention and Prediction in Hohhot-Baotou-Ordos Cities Group of Inner Mongolia(No.2020ZD0013) the Young Scientific&Technological Leading Talent Program of Inner Mongolia(No.NJYT2022092) the Science Fund for Distinguished Young Scholars of Inner Mongolia(No.2019JQ05)。 

主　　题：Water-soluble brown carbon Atmospheric aerosols Optical properties PARAFAC Source apportionment 

摘      要：As a vital type of light-absorbing aerosol,brown carbon(BrC)presents inherent associations with atmospheric photochemistry and climate change.However,the understanding of the chemical and optical properties of BrC is limited,especially in some resource-dependent cities with long heating periods in northwest China.This study showed that the annual average abundances of Water-soluble BrC(WS-BrC)were 9.33±7.42 and 8.69±6.29μg/m^(3)in Baotou and Wuhai and the concentrations,absorption coefficient(Abs_(365)),and mass absorption efficiency(MAE365)of WS-BrC presented significant seasonal patterns,with high values in the heating season and low values in the non-heating season;while showing opposite seasonal trends for the Absorption Angstr?m exponent(AAE_(300-400)).Comparatively,the levels of WS-BrC in developing regions(such as cities in Asia)were higher than those in developed regions(such as cities in Europe and Australia),indicating the significant differences in energy consumption in these regions.By combining fluorescence excitation-emission matrix(EEM)spectra with the parallel factor(PARAFAC)model,humic-like(C1 and C2)and proteinlike(C3)substances were identified,and accounted for 61.40%±4.66%and 38.6%±3.78%at Baotou,and 60.33%±6.29%and 39.67%±4.17%at Wuhai,respectively.The results of source apportionment suggested that the potential source regions of WS-BrC varied in heating vs.non-heating seasons and that the properties of WS-BrC significantly depended on primary emissions(e.g.,combustion emissions)and secondary formation.