2010年1月北京城区大气消光系数重建及其贡献因子  

Reconstructed Ambient Light Extinction Coefficient and Its Contribution Factors in Beijing in January,2010

作　　者：朱李华[1] 陶俊[1] 陈忠明[2] 赵岳[2] 张仁健[3] 曹军骥[4] 

机构地区：[1]环境保护部华南环境科学研究所,广州510655 [2]北京大学环境科学与工程学院,北京100871 [3]中国科学院大气物理研究所,北京100029 [4]中国科学院地球环境研究所,西安710075

出　　处：《环境科学》2012年第1期13-19,共7页Environmental Science

基　　金：国家环境保护公益性行业科研专项(200809143;201009001);国家重点基础研究发展规划(973)项目(2010CB428503)

摘　　要：于2010年1月1～31日在北京城区每天采集PM2.5样品.利用热光碳分析仪、离子色谱和X荧光光谱仪分别分析样品中有机碳/元素碳、水溶性离子和土壤元素,同步收集了大气散射系数(bsp)、吸收系数(bap)和气象数据.利用IMPROVE方程重建大气消光系数,并与实测大气消光系数进行对比.结果发现,PM2.5日均值质量浓度为(144.3±89.1)μg.m-3,实测值bap、bsp和消光系数(bext)分别为(67.4±54.3)、(328.5±353.8)和(395.9±405.2)Mm-1.IMPROVE方程适用于观测期间北京大气消光系数的解析.观测期间计算值b'ext均值为(611±503)Mm-1,(NH4)2SO4、NH4NO3、OM、EC和FS对b'ext的贡献分别为24.6%、11.6%、45.5%、11.9%和6.4%.Aerosol samples for PM2.5 were collected from 1st January to 31st January 2010, in Beijing. The concentrations of organic carbon, elemental carbon, water-solubile ions and soil elements of all particle samples were determined by thermal/optical carbon analyzer,ion chromatography and X-ray fluorescence spectrometer, respectively. The scattering coefficients （bsp）, absorbing coefficients （bap） and meteorological parameters for this period were also measured. Ambient light extinction coefficients were reconstructed by IMPROVE formula and were compared with measured light extinction coefficients. The results showed that the average mass concentration of PM2.5 was （144.3±89.1） μg· m-3 during campaigning period. The average values of measured bap, bsp and extinction coefficient （bext） were （67.4±54.3）, （328.5±353.8） and （395.9±405.2） Mm-1, respectively. IMPROVE formula is suitable for source apportionment of light extinction coefficient in campaign period. The average value of calculated b＇ext was （611±503） Mm-1 in January, 2010. The major contributors to ambient light extinction coefficients included （NH4）2SO4（24.6%）, NH4NO3（11.6%）, OM（45.5%）, EC（11.9%） and FS （6.4%）, respectively.

关 键 词：PM2.5 化学组分 消光系数 重建 贡献因子 

分 类 号：X513[环境科学与工程—环境工程]