沈阳地区PM_(10)、PM_(2.5)和PM_1质量浓度的分析

Analysis on Aerosol Mass Concentrations of PM_(10) 、PM_(2.5) and PM_1 in Shenyang

分析了其时间分布特征。结果表明,沈阳地区的气溶胶分布具有明显的季节差异,气溶胶的质量浓度冬季最高,秋季最低,其中冬季、春季和夏季均超标。PM2.5和PM1分别在PM10中所占的比值均为冬季最高,夏季和秋季次之,春季由于受到沙尘的影响,其比值最低。在各个不同的季节,气溶胶粒子的粒级分布具有相似之处,主要集中在6～8级(<1.1μm)、1级(5.8～9.0μm)、0级(9～10μm)和5级(1.1～2.1μm);春季出现沙尘时粗粒子明显增多,气溶胶粒子的粒级主要集中在0级(9～10μm)、1级和3级(3.3～4.7μm);冬季重污染天气下细粒子浓度高,峰值出现在1级、7级和5级(1.1～2.1μm)。

Aerosol datum from 2006 to 2008 are used to analyze the temporal characterisitics in Shenyang. The results show that the aerosol mass concerntration are obviously seasonal. The concerntration are the highest in winter,the lowest in autumn and exceed the criteria in winter,spring and summer. The ratios of PM2.5/PM10 and PM1/PM10 are the highest in winter and the lowest in spring due to the dust. In different seasons,size distributions of aerosol particle have similar aspects. The concentration mainly focus on classical 6-8,1,0and 5. Coarse particles grow significantly during sand-dust in spring when the concentration mainly focus on classical 0,classical 1and classical 3.During heavy pollution processing in winter,fine particles concentrations become rather high which mainly focus on onclassical 1,classical 7and classical 5.