| 2010年1月北京城区大气消光系数重建及其贡献因子 |
| 摘要点击 5807 全文点击 2082 修订日期：2011-05-20 |
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| 中文关键词 PM2.5 化学组分 消光系数 重建 贡献因子 |
| 英文关键词 PM2.5aerosol chemical compositions extinction coefficient reconstruction contribution factors |
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| 中文摘要 |
| 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%. |
| 英文摘要 |
| 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. |
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