文献类型：期刊文献

英文题名：Chemical characterization, the transport pathways and potential sources of PM2.5 in Shanghai: Seasonal variations

作者：Zhao, Mengfei[1];Huang, Zhongsi[1];Qiao, Ting[1];Zhang, Yuankai[1];Xiu, Guangli[1];Yu, Jianzhen[2]

机构：[1]ECUST, State Environm Protect Key Lab Risk Assessment &, Shanghai 200237, Peoples R China;[2]Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong, Peoples R China

年份：2015

卷号：158

起止页码：66

外文期刊名：ATMOSPHERIC RESEARCH

收录：;EI(收录号：20153401192704);WOS:【SCI-EXPANDED(收录号:WOS:000352328900006)】；

基金：The authors thank very much the financial support by Ph.D. Programs Foundation of Ministry of Education of China (No.20120074140001), NSFC Grant (21277044) and Shanghai Pujiang Program (13PJ D013). The Fundamental Research Funds for the Central Universities (WB1113005) and National Undergraduates Innovating Experimentation Project of China (20130251068) also gave partially financial support. The authors thank very much the kind help of the group of atmospheric environmental chemistry from Hong Kong University of Science & Technology for OC, EC and HULIS measurement.

语种：英文

外文关键词：Carbonaceous components; Humic-like substance carbon (HULIS-C); Acidity; Factor analysis (FA); Potential source contribution function (PSCF); Concentration weighted trajectory (CWT)

摘要：The 24-h PM2.5 samples were collected at the site of East China University of Science and Technology (ECUST) in Shanghai from 2011 to 2012, representing winter, spring, summer and autumn, respectively. And PM2.5 and its chemical components including organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC), humic-like substance carbon (HULIS-C) and water-soluble ions were analyzed. The results suggested that the average PM2.5 concentrations were (70.35 +/- 43.75) mu g/m(3), (69.76 +/- 38.67) +/- g/m(3), (51.26 +/- 2825) mu g/m(3) and (8237 +/- 48.70) mu g/m(3) in winter, spring, summer and autumn, respectively. Secondary inorganic ions (sulfate, nitrate and ammonium) were the dominant pollutants of PM2.5 in the four seasons. Total carbon (TC) was an important component explaining above 15% of PM2.5. OC/EC ratios were all above 2 ranging from 4.31 to 6.35; particularly in winter it reached the highest 6.35 which demonstrated that secondary organic carbon (SOC) should be a significant composition of PM2.5. The SOC calculated based on the OC/EC ratio method had stronger correlation with WSOC in summer and autumn (summer: R-2 = 0.73 and autumn: R-2 = 0.75). The HULIS-C and SOC most significantly correlated in autumn (R-2 = 0.83). The data showed that PM2.5 atmospheric aerosols were more acidic in autumn and the concentrations of PM2.5 and its chemical components were much higher. Factor analysis (FA), cluster analysis of air mass back trajectories, potential source contribution function (PSCF) model and concentration weighted trajectory (CWT) model were used to investigate the transport pathways and identify potential source areas of PM2.5 in different seasons. FA identified various sources of PM2.5: secondary aerosol reactions, the aged sea salts and road dusts. The results of cluster analysis, PSCF model and CWT model demonstrated that the local sources in the Yangtze River Delta Region (YRDR) made significant contributions to PM2.5. During winter and autumn long-time transport from the Circum-Bohai-Sea Region (CBSR) and northwestern China including the Inner Mongol had adverse effects. (c) 2015 Elsevier B.V. All rights reserved.