On using an aerosol thermodynamic model to calculate aerosol acidity of coarse particles  

作　　者：Zhengyang Fang Shuwei Dong Chengpeng Huang Shiguo Jia Fu Wang Haoming Liu He Meng Lan Luo Yizhu Chen Huanhuan Zhang Rui Li Yujiao Zhu Mingjin Tang 

机构地区：[1]State Key Laboratory of Organic Geochemistry,Guangdong Key Laboratory of Environmental Protection and Resources Utilization,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China [2]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 101408,China [3]Longhua Center for Disease Control and Prevention of Shenzhen,Shenzhen 518109,China [4]School of Atmospheric Sciences and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Sun Yat-sen University,Zhuhai 519082,China [5]Institute for Environmental and Climate Research,Jinan University,Guangzhou 510632,China [6]Qingdao Eco-environment Monitoring Center of Shandong Province,Qingdao 266003,China [7]Environment Research Institute,Shandong University,Qingdao 266237,China

出　　处：《Journal of Environmental Sciences》2025年第2期46-56,共11页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China (Nos.42022050 and 42277088);the Guangdong Basic and Applied Basic Research Fund Committee (Nos.2021A1515011248 and 2023A1515012010);the Guangdong Foundation for the Program of Science and Technology Research (No.2020B1212060053).

摘　　要：Thermodynamic modeling is still themostwidely usedmethod to characterize aerosol acidity,a critical physicochemical property of atmospheric aerosols.However,it remains unclear whether gas-aerosol partitioning should be incorporated when thermodynamicmodels are employed to estimate the acidity of coarse particles.In this work,field measurements were conducted at a coastal city in northern China across three seasons,and covered wide ranges of temperature,relative humidity and NH_(3) concentrations.We examined the performance of different modes of ISORROPIA-II(a widely used aerosol thermodynamic model)in estimating aerosol acidity of coarse and fine particles.The M0 mode,which incorporates gas-phase data and runs the model in the forward mode,provided reasonable estimation of aerosol acidity for coarse and fine particles.Compared to M0,the M1 mode,which runs the model in the forward mode but does not include gas-phase data,may capture the general trend of aerosol acidity but underestimates pH for both coarse and fine particles;M2,which runs the model in the reverse mode,results in large errors in estimated aerosol pH for both coarse and fine particles and should not be used for aerosol acidity calculations.However,M1 significantly underestimates liquid water contents for both fine and coarse particles,while M2 provides reliable estimation of liquid water contents.In summary,our work highlights the importance of incorporating gas-aerosol partitioning when estimating coarse particle acidity,and thus may help improve our understanding of acidity of coarse particles.

关 键 词：Aerosol acidity Coarse particles Thermodynamic model Aerosol liquid water ISORROPIA-II Gas-aerosol partitioning 

分 类 号：X513[环境科学与工程—环境工程]