气溶胶细粒子与能见度的相关性

Relationship between aerosol fine particle and visibility

为了分析气溶胶粒子特别是细粒子(PM2.5)对能见度的影响,从理论上建立了气溶胶细粒子与能见度的关系,分析了谱分布的变化对PM2.5/PM10和细粒子消光所占总消光比重的影响。对测量数据与理论计算结果进行了对比分析,结果表明:所建立的气溶胶细粒子与能见度的关系是合理的,理论计算的误差小于30%,这对治理污染和提高城市能见度具有指导意义。

The effect of aerosol fine particle（PM2.5） on the visibility was discussed, and the relation- ship between PM2.5 and visibility was established theoretically. The relative PM2.5/PM10 and extinction coefficient were analyzed with changing of particle distributions based on Mie scattering theory. By comparison of measured data and calculated values, experimental results indicate that the pollution of PM2.5 is the main factor that results in visibility dropping, and the error of calculated value is less than 30% ,which is significant for dealing with pollution of PM2.5 and improving atmospheric visibility.