[Characteristics and Parameterization for Atmospheric Extinction Coefficient in Beijing].
[Characteristics and Parameterization for Atmospheric Extinction Coefficient in Beijing].
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发表时间：
2015-10
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通讯作者：
Yi-na Chen;P. Zhao;D. He;F. Dong;Xiujuan Zhao;Xiao-ling Zhang
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作者：
Yi-na Chen;P. Zhao;D. He;F. Dong;Xiujuan Zhao;Xiao-ling Zhang
为了研究北京市大气消光系数特征，2013 - 2014年对大气能见度、PM2.5浓度、散射系数、黑碳、活性气体、气象参数等进行了系统测量。在此基础上，比较了已发表的气溶胶光散射增强系数[f(RH)]的拟合方案，讨论了大气消光系数的特征及其关键影响因素。建立了一套不同季节、不同污染程度的大气消光系数参数化模型。结果表明，气溶胶散射占总消光量的94%以上。夏季和秋季，高相对湿度引起的气溶胶吸湿性增长使气溶胶散射系数增加了70 ~ 80%。参数化模式能够反映气溶胶和相对湿度对环境光消的影响机理，并描述气溶胶消光能力的季节变化。
In order to study the characteristics of atmospheric extinction coefficient in Beijing, systematic measurements had been carried out for atmospheric visibility, PM2.5 concentration, scattering coefficient, black carbon, reactive gases, and meteorological parameters from 2013 to 2014. Based on these data, we compared some published fitting schemes of aerosol light scattering enhancement factor [ f(RH)], and discussed the characteristics and the key influence factors for atmospheric extinction coefficient. Then a set of parameterization models of atmospheric extinction coefficient for different seasons and different polluted levels had been established. The results showed that aerosol scattering accounted for more than 94% of total light extinction. In the summer and autumn, the aerosol hygroscopic growth caused by high relative humidity had increased the aerosol scattering coefficient by 70 to 80 percent. The parameterization models could reflect the influencing mechanism of aerosol and relative humidity upon ambient light extinction, and describe the seasonal variations of aerosol light extinction ability.