Quantitative analysis of influencing factors to aerosol pH and its responses to PM_(2.5)and O_(3)pollution in a coastal city  

作　　者：Ke Xu Liqian Yin Qiaoling Chen Dan Liao Xiaoting Ji Keran Zhang Yu Wu Lingling Xu Mengren Li Xiaolong Fan Fuwang Zhang Zhi Huang Jinsheng Chen Youwei Hong 

机构地区：[1]Center for Excellence in Regional Atmospheric Environment,Key Lab of Urban Environment and Health,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [2]School of Life Sciences,Hebei University,Baoding 071000,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]College of Resources and Environment,Fujian Agriculture and Forest University,Fuzhou 350002,China [5]College of Chemical Engineering,Huaqiao University,Xiamen 361021,China [6]College of Environment and Public Health,Xiamen Huaxia University,Xiamen 361024,China [7]Fujian Key Laboratory of Atmospheric Ozone Pollution Prevention,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [8]Environmental Monitoring Center of Fujian,Fuzhou 350003,China [9]Xiamen Institute of Environmental Science,Xiamen 361021,China

出　　处：《Journal of Environmental Sciences》2025年第5期284-297,共14页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.42277091 and U22A20578);Xiamen Youth Innovation Fund Project(No.3502Z20206094);Fujian Provincial Environmental Protection Science&Technology Plan Projects(No.2023R004);Xiamen Atmospheric Environment Observation and Research Station of Fujian Province.

摘　　要：Aerosol acidity(pH)plays an important role in the multiphase chemical processes of atmospheric particles.In this study,we demonstrated the seasonal trends of aerosol pH calculated with the ISORROPIA-II model in a coastal city of southeast China.We performed quantitative analysis on the various influencing factors on aerosol pH,and explored the responses of aerosol pH to different PM_(2.5)and O_(3)pollution levels.The results showed that the average aerosol pH was 2.92±0.61,following the order of winter>spring>summer>autumn.Sensitivity tests revealed that SO_(4)^(2−),NH_(x),T and RH triggered the variations of aerosol pH.Quantitative analysis results showed that T(37.9%-51.2%)was the main factors affecting pH variations in four seasons,followed by SO_(4)^(2−)(6.1%-23.7%),NH_(x)(7.2%-22.2%)and RH(0–14.2%).Totally,annual mean meteorological factors(52.9%)and chemical compositions(41.3%)commonly contributed the aerosolpH in the coastal city.The concentrations of PM_(2.5)was positively correlated with aerosol liquid water content(R^(2)=0.53)and aerosol pH(R^(2)=0.26),indicating that the increase in pH was related with the elevated NH_(4)NO_(3)and decreased SO_(4)^(2−),and also the changes of T and RH.The O_(x)(O_(3)+NO_(2))was moderately correlated with aerosol pH(R^(2)=-0.48),attributable to the fact that the proportion of SO_(4)^(2−)increased under high T and low RH conditions.The study strengthened our understanding of the contributions of influencing factors to aerosol pH,and also provided scientific evidences for chemical processes of atmospheric particles in coastal areas.

关 键 词：Aerosol acidity Aerosol liquid water Fine particular matter(PM_(2.5)) Ozone(O_(3)) Coastal city 

分 类 号：X513[环境科学与工程—环境工程]