太原冬季大气气溶胶的散射特征

Characterization of Aerosol Scattering Properties During Winter in Taiyuan

利用积分浊度仪于2005年12月17日-2006年2月14日对太原市区气溶胶散射特性进行了观测分析。结果表明:观测期间气溶胶散射系数小时平均值为(850.2±611.3)Mm-1,散射系数在200～300Mm-1之间出现的频率最高。太原冬季大气气溶胶散射系数的日变化呈双峰型,散射系数与PM2.5小时平均浓度的线性相关性较好(R2=0.82),表明细粒子对散射系数有很大的贡献。观测结果显示气象条件是影响气溶胶散射特性的重要因素之一。

Continuous observation of atmospheric aerosol scattering properties was conducted from 17 December 2005 to 14 February 2006 in Taiyuan using the Integrating Nephelometer. The results indicate that the mean value of the scattering coefficient was （850.2 ± 611.3） Mm ^-1. The frequency distribution of the hourly average scattering coefficient had a maximum in the range of 200-300 Mm^-1. The diurnal variation of the scattering coefficient presents a curve of two peaks. The hourly average concentration of PM2.5 and scattering coefficient are significantly correlated （R^2= 0.82）. It is found that the atmospheric aerosol scattering properties are comprehensively affected by the meteorological conditions.