Insights into the seasonal characteristics of single particle aerosols in Chengdu based on SPAMS  

作　　者：Junke Zhang Yunfei Su Chunying Chen Xinyi Fu Yuhan Long Xiaoxue Peng Xiaojuan Huang Gehui Wang Wei Zhang 

机构地区：[1]Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China [2]Department of Environmental Science&Engineering,Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3),Fudan University,Shanghai 200438,China [3]Key Lab of Geographic Information Science of the Ministry of Education,School of Geographic Sciences,East China Normal University,Shanghai 200241,China [4]Sichuan Ecological Environment Monitoring Station,Chengdu 610091,China

出　　处：《Journal of Environmental Sciences》2025年第3期431-443,共13页环境科学学报(英文版)

基　　金：supported by the Basic Research Cultivation Support Plan of Southwest Jiaotong University(No.2682023ZTPY016);the Natural Science Foundation of Sichuan Province(No.2022NSFSC0982);the National Natural Science Foundation of China(Nos.U23A2030,42205100,and 41805095).

摘　　要：To investigate the seasonal characteristics in air pollution in Chengdu,a single particle aerosol mass spectrometry was used to continuously observe atmospheric fine particulate matter during one-month periods in summer and winter,respectively.The results showed that,apart from O_(3),the concentrations of other pollutants(CO,NO_(2),SO_(2),PM_(2.5)and PM_(10))were significantly higher in winter than in summer.All single particle aerosols were divided into seven categories:biomass burning(BB),coal combustion(CC),Dust,vehicle emission(VE),K mixedwith nitrate(K-NO_(3)),Kmixed with sulfate and nitrate(K-SN),and K mixedwith sulfate(K-SO_(4))particles.The highest contributions in both seasons were VE particles(24%).The higher contributions of K-SO_(4)(16%)and K-NO_(3)(10%)particles occurred in summer and winter,respectively,as a result of their different formation mechanisms.S-containing(KSO_(4)and K-SN),VE,and BB particles caused the evolution of pollution in both seasons,and they can be considered as targets for future pollution reduction.The mixing of primary sources particles(VE,Dust,CC,and BB)with secondary components was stronger in winter than in summer.In summer,as pollution worsens,the mixing of primary sources particles with 62[NO_(3)]−weakened,but themixing with 97[HSO_(4)]−increased.However,in winter,the mixing state of particles did not exhibit an obvious evolution rules.The potential source areas in summer were mainly distributed in the southern region of Sichuan,while in winter,besides the southern region,the contribution of the western region cannot be ignored.

关 键 词：Single particle aerosols Chemical composition Mixing state Regional transport Seasonal characteristics 

分 类 号：X513[环境科学与工程—环境工程]