To investigate aerosol optical properties in the Beijing metropolitan area, aerosol absorption coefficient (A_(b)), scattering coefficient (S_(c)), and fine particulate matter (PM_(2.5)) were measured in the Beijing urban area from 20 May to 30 August 2009. The average A _(b), S _(c), single scattering albedo (SSA), and PM_(2.5) concentration were 58.0±39.5 M m~(-1), 343.5±353.7 M m~(-1), 0.80±0.10 and 63.6±50.0 μg m~(-3), respectively, during the observation period. A _(b), S _(c), and SSA all showed single peak diurnal variations, with their maximum values being measured at 0500, 1000, and 1300 local time, respectively. A _(b) and S _(c) had a strong positive correlation with PM_(2.5), and A _(b), S _(c), and PM_(2.5) all had positive correlations with relative humidity and negative correlations with wind speed.
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机译：为了调查北京市区的气溶胶光学特性，从5月20日开始在北京市区测量气溶胶吸收系数（A_（b）），散射系数（S_（c））和细颗粒物（PM_（2.5））。至2009年8月30日。平均A_（b），S_（c），单散射反照率（SSA）和PM_（2.5）浓度为58.0±39.5 M m〜（-1），观测期分别为343.5±353.7 M m〜（-1），0.80±0.10和63.6±50.0μgm〜（-3）。 A _（b），S _（c）和SSA均显示出单峰日变化，其最大值分别在当地时间0500、1000和1300测得。 A _（b）和 S _（c）与PM_（2.5）以及 A _（b）， S _（c）和PM_（ 2.5）与相对湿度呈正相关，与风速呈负相关。
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