摘要：为了解夏季广州大气中细粒子消光特性,利用浊度仪、黑碳仪和自动气象站获得散射系数μsp、吸收系数μap以及气象要素等观测数据,并利用采样器采集大气悬浮颗粒物PM_2.5和PM_1.0样品获取其质量浓度。结果表明,散射系数μsp、吸收系数μap和大气消光系数(μext=μsp+μap)的平均值分别为(226±111)、(53±20)、(280±125)Mm-1;大气悬浮颗粒PM_2.5和PM_1.0的质量浓度分别为(53.7±23.2)、(46.1±21.3)μg/m³;消光系数μext与PM_2.5和PM_1.0的相关性系数分别达到0.96和0.93;PM_2.5和PM_1.0的平均质量浓度消光效率分别为到5.2、5.5 m²/g,表明大气中小粒径的粒子对消光系数的影响更为明显。

关键词：散射系数；吸收系数；消光系数；悬浮颗粒

Abstract：To obtain the extinction properties of fine particles in aerosol,light scattering μsp,absorption coefficient μap and selected meteorological factors were measured with a Nephelometer,an Aethalometer and an automatic weather station,respectively,in July 2008.In-situ PM_2.5 and PM_1.0 mass concentrations were collected by two samplers.The results show that the average light scattering μsp、absorption coefficient μap and light extinction eoefficient(μext=μsp+μap) are(226±111),(53±20),(280±125) Mm-1,respectively.The mass concentrations of PM_2.5 and PM_1.0 are(53.7±23.2),(46.1±21.3) μg/m³.The correlation coefficients of μext to PM_2.5 and PM_1.0 are 0.96 and 0.93.The mass extinction efficients of PM_2.5 and PM_1.0 are 5.2,5.5 m²/g.It suggests that the smaller size particles have higher extinction efficiency than the larger ones.

Keywords：scattering coefficient；absorbing coefficient；extinction coefficient；suspended particles