Compositions and Distributions of Secondary Organic Aerosols and Their Tracers over the Pearl River Estuary Region Influenced by Continental and Marine Air Masses  

作　　者：Zhenhao LING Junlin HUANG Liqing WU Yee Jun THAM Guizhen FANG Bing WU Lili MING Xuemei WANG Xiang DING 

机构地区：[1]School of Atmospheric Sciences,Sun Yat-sen University,Key Laboratory of Tropical Atmosphere-Ocean System,Ministry of Education,and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai,China [2]College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang,China [3]School of Marine Sciences,Sun Yat-sen University,Zhuhai,China [4]Technical Center of Gongbei Customs District of China,Zhuhai,China [5]College of Environment and Climate,Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Jinan University,Guangzhou,China [6]Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,China

出　　处：《Advances in Atmospheric Sciences》2025年第4期682-696,共15页大气科学进展(英文版)

基　　金：supported by the State Key Program of the National Natural Science Foundation of China(Grant Nos.42230701,91644215);the National Natural ScienceFoundation of China(Grant Nos.42122062 and 42307137);the Guangdong Basic and Applied Basic Research Foundation(Grant No.2022A1515010852);the Fundamental Research Funds for the Central Universities,Sun Yat-sen University(Grant No.23hytd002);the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(Grant No.SML2023SP218);L.M.acknowledges the Zhuhai Science and Technology Plan Project(Grant No.ZH22036201210115PWC).

摘　　要：The compositions and distributions of monoterpenes,isoprene,aromatics and sesquiterpene SOA tracers(SOAM,SOAI,SOAA and SOAS,respectively)at an island site(Da Wan Shan Island,DWS)were investigated in the context of the influence of continental and marine air masses over the Pearl River Estuary(PRE)region in winter 2021.The sum concentration of SOA tracers was 6.2–132.8 ng m^(−3),with SOAM and SOAI as the main components in both continental(scenarios A1 and A2)and marine air masses(scenario A3),as well as their combination(scenario A4).The highest and lowest levels of SOAM were observed in A1 and A3,respectively,which were mainly related to the variations in meteorological conditions,precursor concentrations,and the degree of photochemical processes.Higher MBTCA/HGA(3-methyl-1,2,3-butanetricarboxylic acid/3-hydroxyglutaric acid)ratios suggested a less significant contribution fromα-pinene to SOAM.The variations of SOAI in the different scenarios were associated with differences in relative humidity,particle acidity,and isoprene/NOx ratios.The respective highest and lowest concentrations of aromatics SOA tracers in A1 and A3 revealed the influence of anthropogenic precursors from upwind continental areas,which was confirmed by the correlation among biogenic and anthropogenic precursors.The results of the tracer-based-method suggested dominant contributions of SOAs from aromatics and monoterpenes,with the highest concentrations in A1.A WRF-Chem simulation revealed that the SOAs from the above precursors only contributed 12%–25%to the total SOA at DWS,while the spatial distributions of SOAs further highlighted that the abundance of SOAs over the PRE region in winter is highly associated with air masses transported from upwind continental areas.

关 键 词：secondary organic aerosols tracers continental and marine air masses Pearl River Estuary region 

分 类 号：X513[环境科学与工程—环境工程]