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西安市秋季大气颗粒物散射特征及其影响因素
Authors
刘随心[1]
周雅清[1,2]
+3 more
张婷[1]
曹军骥[1,3]
王启元[1]
Publication date
10 April 2015
Publisher
Abstract
为研究污染条件下西安市秋季大气颗粒物的散射特征及其影响因素,于2012年11月监测大气颗粒物散射系数并采集PM_(2.5)样品。探讨了大气颗粒物的散射日变化特征,通过实验分析PM_(2.5)中水溶性离子(Na~+、NH_4~+、K~+、Mg~(2+)、Ca~(2+)、F~-、Cl~-、NO_3~-和SO_4~(2-))和含碳物质(有机碳和元素碳)的污染水平,并讨论它们的来源及对散射系数的影响。结果表明,颗粒物的散射系数均值为(579±387)Mm~(-1),夜间高日间低。PM_(2.5)质量浓度与散射系数呈现出较强的线性关系(相关系数为0.85),通过回归方程得到PM_(2.5)散射效率为3.09 m~2·g~(-1)。在PM_(2.5)化学组分中,有机物对消光系数的贡献最大,占52.3%;其次是NH_4NO_3和(NH_4)_2SO_4,贡献率分别为16.2%和13.7%。</p
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Last time updated on 03/02/2019