Optical properties and chemical composition of PM_(2.5) in Shanghai in the spring of 2012  

作　　者：Guanghan Huang Tiantao Cheng Renjian Zhang Jun Tao Chunpeng Leng Yunwei Zhang Shuping Zha Deqin Zhang Xiang Li Chunyang Xu 

机构地区：[1]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP~3),Department of Environmental Science and Engineering,Fudan University [2]Fudan-Tyndall Centre,Fudan University [3]Key Laboratory of Region Climate-Environment Research for Temperate East Asia (RCE-TEA),Institute of Atmospheric Physics,Chinese Academy of Sciences [4]South China Institute of Environmental Sciences [5]Jiangsu Suqian Meteorological Bureau

出　　处：《Particuology》2014年第2期52-59,共8页颗粒学报（英文版）

基　　金：supported by the National Basic Research Program of China(2010CB428503);the National Natural Science Foundation of China(41075096,21190053,21177025);the Shanghai Science and Technology Commission of Shanghai Municipality(12DJ1400100,12DZ2260200);the Priority Fields for Ph.D.Programs Foundation of Ministry of Education of China (0110071130003);an FP7 project(AMIS,PIRSES-GA-2011)

摘　　要：The semi-diurnal mean aerosol mass concentration, chemical composition, and optical properties of PM2.s were investigated in Shanghai during the spring of 2012. Slight pollution was observed during the study period. The average PM2.s concentration was 64.11± 22.83μg/m3. The mean coefficients of extinction, scattering, and absorption at 532 nm were 125.9 ± 78.5, 91.1 ± 56.3, and 34.9 ±23.6 Mm-1, respectively. A relatively low mean single scattering alhedo at 532 nm （0.73 ±0.04） and low level of elemental carbon （EC, 2.67± 1.96 μg/m3） suggested that the light absorption was enhanced due to the internal mixing of the EC. Sulfate contributed the most to aerosol light scattering in Shanghai. The chemical composition of PM2.5 was dominated by particulate organic matter, sulfate, nitrate, ammonium, and EC. Anthropogenic sources made a significant contribution to the emission and loading of the particulate pollutants. A relatively good correlation between the aerosol chemical composition and the cloud condensation nuclei （CCN） activation indicated that aerosol chemistry is an important factor that influences the saturated hygroscopicity and growth of the aerosol.The semi-diurnal mean aerosol mass concentration, chemical composition, and optical properties of PM2.s were investigated in Shanghai during the spring of 2012. Slight pollution was observed during the study period. The average PM2.s concentration was 64.11± 22.83μg/m3. The mean coefficients of extinction, scattering, and absorption at 532 nm were 125.9 ± 78.5, 91.1 ± 56.3, and 34.9 ±23.6 Mm-1, respectively. A relatively low mean single scattering alhedo at 532 nm （0.73 ±0.04） and low level of elemental carbon （EC, 2.67± 1.96 μg/m3） suggested that the light absorption was enhanced due to the internal mixing of the EC. Sulfate contributed the most to aerosol light scattering in Shanghai. The chemical composition of PM2.5 was dominated by particulate organic matter, sulfate, nitrate, ammonium, and EC. Anthropogenic sources made a significant contribution to the emission and loading of the particulate pollutants. A relatively good correlation between the aerosol chemical composition and the cloud condensation nuclei （CCN） activation indicated that aerosol chemistry is an important factor that influences the saturated hygroscopicity and growth of the aerosol.

关 键 词：PM2.5 Chemical compositionOptical property 

分 类 号：X513[环境科学与工程—环境工程] O484.41[理学—固体物理]