Characterization and source identification of submicron aerosol dur ing ser ious haze pollution periods in Beijing  

作　　者：Peng Xu Yuan Yang Junke Zhang Wenkang Gao Zirui Liu Bo Hu Yuesi Wang 

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [2]College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,Guizhou,China [3]Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China [4]University of the Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2022年第2期25-37,共13页环境科学学报（英文版）

基　　金：supported by the Ministry of Science and Technology of China(No.2017YFC0210000);the Science and Technology Planned Project in Guizhou Province(Qian Kehe Foundation[2019]1Y175);the Introducing Talent in Guizhou University(2018)。

摘　　要：Submicron aerosol is of extensive concern not only due to its significant impact on air quality but also because it is detrimental to human health.In this study,we investigated the characteristics,sources and chemical processes of submicron aerosol based on realtime online measurements of submicron aerosols(NR-PM 1)during December 2015 at an urban site in Beijing.The average mass concentration of NR-PM 1 was 92.5±84.9μg/m^(3),the hourly maximum was 459.1μg/m^(3) during the entire observation.The organic aerosol(OA)(55%)was the largest contributor to NR-PM 1.The average mass concentration of PAHs was 0.217±0.247μg/m^(3),exhibiting the highest concentration at night and the lowest levels in the daytime.The average mass concentration of organic nitrate was 2.52±2.36μg/m^(3) and that of inorganic nitrate was 7.62±8.22μg/m^(3),accounting for 36%and 64%,respectively,of the total nitrate mass.Positive matrix factorization(PMF)differentiated the OA into five chemical components including LV-OOA,SV-OOA,COA,HOA and CCOA,accounting for 22%,16%,13%,25%and 24%respectively,of the total OA.The average NR-PM 1 mass concentration on the heavy polluted days(HPD)was 182.8±70.2μg/m^(3),which was approximately 9 times that on clean days(CD).The enhanced secondary formation of SNA was evident on HPD,especially the rapid increase of sulfate(23%)and nitrate(19%).

关 键 词：Haze pollution Submicron aerosol Source apportionment PAHs Organic and inorganic nitrate 

分 类 号：X513[环境科学与工程—环境工程]