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北京市大气细粒子的来源分析 被引量:187

Source Apportionment on Fine Particles in Beijing
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摘要 细粒子 (空气动力学直径小于 2 5 μm的颗粒物 )污染是许多城市重要的大气环境问题 .从 1 999年至 2 0 0 0年对北京市细粒子展开了 4次采样和化学分析 ,有效采样天数为 40d .利用正定矩阵分解 (PMF)方法对细粒子的来源进行了分析 .化学成分包括EC(元素碳 )、有机物、SO2 - 4、F- 、Cl- 、Fe、Ca、K、Mg、Al、Na、Zn、Mn、Ti、Pb、Ba和P等 1 7种 .发现主要来源有 6类 :地面扬尘、建筑源、生物质燃烧、二次源、机动车排放和燃煤 . The positive matrix factorization(PMF)method was used to apportion the sources for fine particles in Bejing.The data were obtained from four samplings from 1999 to 2000.The number of this data set was 40.The chemical compositions used in analysis include element carbon(EC),organics,SO 2- 4,F -,Cl -,Fe,Ca,K,Mg,Al,Na,Zn,Mn,Ti,Pb,Ba and P.Six main sources,soil dust,construction dust,secondary source(by photochemical action),biomass burning,motor vehicle and coal burning were found.
出处 《环境科学》 EI CAS CSCD 北大核心 2002年第6期11-16,共6页 Environmental Science
基金 北京市"蓝天工程"--能见度影响因素和改善途径研究
关键词 北京 大气细粒子 来源分析 源解析 正定矩阵分解 source apportionment positive matrix factorization fine particles (PM2.5) Beijing
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