To obtain the extinction properties of fine particles in aerosol, light scattering/μmp,, absorption coefficient μmp and selected meteorological factors were measured with a Nephelometer, an Aethalometer and an automatic weather station, respectively, in July 2008. In-situ PM25 and PM,o mass concentrations were collected by two samplers. The results show that the average light scattering μmp、bsorption coefficient μmp and light extinction coefficient (ΜEST=ΜSP+ΜSP) are (226±lll).(53±20),(280± 125) Mm-1, respectively. The mass concentrations of PM25 and PM1.0 are (53.7±23.2), (46.1 ±21.3) μ.g/m3. The correlation coefficients ofμect to PM25 and PM1.0, are 0.96 and 0.93. The mass extinction efficients of PM25 and PM1.0 are 5.2, 5.5 m2/g. It suggests that the smaller size particles havernhigher extinction efficiency than the larger ones.%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PM2.5必和PM1.0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PM2.5和PM1.0的质量浓度分别为(53.7±23.2)、(46.1±21.3)μg/m3；消光系数μext与PM2.5和PM1.0的相关性系数分别达到0.96和0.93；PM2.5和PM1.0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.
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