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《Acta Scientiae Circumstantiae》 2013-11
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Seasonal variations and source apportionment of PM_(2.5)at urban area of Chengdu

ZHANG Zhisheng;TAO Jun;XIE Shaodong;ZHOU Laidong;SONG Danlin;ZHANG Pu;CAO Junji;LUO Lei;South China Institute of Environmental Sciences,MEP;College of Environmental Sciences and Engineering,Peking University;Chengdu Academy of Environmental Protection;Institute of Earth Environment,Chinese Academy of Sciences;Institute of Plateau Meteorology,China Meteorological Administration;  
Daily PM2.5 samples were collected from 2009 to 2010 during a typical month of each season at an urban site of Chengdu.The mass concentration and chemical compositions (including carbonaceous species,water-soluble inorganic ions and elements) of PM2.5 were determined.The results showed that the average PM2.5 mass concentration was (165.1±85.1) μg·m-3,which was 4.7 times the annual PM2.5National Ambient Air Quality Standard of China.The average concentrations of OC,EC and total secondary inorganic ions (SO2-4,NO-3 and NH+4) were (22.6±10.2)μg·m-3,(9.0±5.4) μg·m-3 and (62.8±44.3) μg·m-3,accounting for 13.7%,5.5% and 38.0% of PM2.5 mass concentration,respectively.Higher levels of PM2.5 mass concentration and their major chemical compositions were found in autumn and winter compared to those found in spring and summer.Positive Matrix Factorization (PMF) model was performed to identify the sources of PM2.5 at urban Chengdu.Four sources significantly contributing to the observed PM2.5 were: soil dust and fugitive dust,biomass burning,vehicle emissions and secondary nitrate/sulfate,with the contributions of 14.3%,28.0%,24.0% and 31.3% to PM2.5 mass concentration,respectively.These four sources exhibited distinct seasonal patterns:the relative contribution of biomass burning to total PM2.5 was relatively high for all seasons; the relative contribution of soil dust and fugitive dust increased significantly during spring; vehicle emissions contributed significantly during summer; and the highest relative contribution to PM2.5 during autumn and winter was secondary nitrate/sulfate factor.
【Fund】: 国家环境保护公益性行业科研专项(No.201009001);; 中央级公益性科研院所基本科研业务专项(No.PM-ZX021-201211-104)~~
【CateGory Index】: X513
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