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《Environmental Science & Technology》 2017-01
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Source Apportionment of Black Carbon Aerosol During Straw-burning Period in Spring and Summer in Nanjing

HUA Yan;TANG Lili;LIU Dantong;ZHANG Yunjiang;JIANG Lei;YU Yiyong;FU Yin;CHEN Cheng;QIN Wei;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology;Jiangsu Environmental Monitoring Center;School of Earth, Atmospheric and Environmental Science, University of Manchester;Nanjing Environmental Monitoring Center Station;  
Black carbon aerosol(BC) in the atmosphere can strongly affect both air quality and climate.High concentration of BC has been directly observed in straw-burning plumes during harvest seasons in China.However,it is still poorly understood to identify and quantify the BC sources.Based on the real-time and on-line measurements of seven-wavelength Aethalometer and combined with the Aethalometer model,we report the contribution of fossil fuel combustion and biomassburning emission to BC during the spring and summer harvest at three sites of Nanjing,including an urban,a suburban and a rural.Results show that the mean mass concentration of BC was 4.28 μg/m~3,5.10 μg/m~3 and 4.56 μg/m~3 for the urban,suburban and rural area respectively,during the entire study.And BC from both fossil fuel combustion and biomass burning emission averagely accounts for 82.5%and 17.5%,82.9%and 17.1%,and 85.5%and 15.5%of the total BC concentration respectively at the above sampling sites.This means that the fossil fuel combustion is the major source of BC in the atmosphere at Nanjing during the sampling period.When the average concentration of BC was very high(~19.46 μg/m~3),the contributions both of fossil fuel combustion and biomass-burning emission to BC were 69.0%~75.6%and 24.4%~31.0%.Meanwhile,the potential source contribution function suggest that biomass burning emission from south Anhui Province is a major potential source of BC over Nanjing,which may contribute the large fraction to the high BC loadings.
【Fund】: 国家自然科学基金重大研究计划(D0512/91544231);; 江苏省环保科研课题(2015017)
【CateGory Index】: X513
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