青岛市连续天气过程中不同气溶胶浓度特征对比分析

Analysis of Aerosol Concentration Characteristics Under Continuous Synoptic Systems in Qingdao

利用青岛市沙尘暴监测站GRIMM180颗粒物监测仪采集到的质量浓度和数浓度数据,结合2008年5月27～28日天气系统演变进行气溶胶定性分类,对海雾气溶胶、清洁气溶胶、浮尘气溶胶的浓度进行对比分析.结果表明,①清洁气溶胶、海雾气溶胶、浮尘气溶胶的总质量浓度有明显差异;②海雾气溶胶以1～2.5μm粒子的滞留最明显,清洁气溶胶中<1μm的粒子贡献率最大,浮尘气溶胶则以2.5～10μm的颗粒物级数增加最具代表性,不同气溶胶相应大小粒子的质量浓度贡献率之比明显不同;③降水系统对>0.6μm较大的粒子有明显的清除作用,对<0.6μm的数浓度有增大作用;④<1μm尤其是<0.6μm的粒子处于天气系统前部到达潮湿空气时有特殊的活化现象;⑤不同粒径尺度的粒子数浓度随气溶胶性质的转变呈现不同的模态.

Based on weather data and data obtained by Particle Sizer GRIMM180 set up in Qingdao,aerosol was qualitively classified into sea-fog aerosol,refreshing aerosol and suspended dust aerosol. Analysis of mass concentration and number concentration of three different kinds of aerosols was conducted,and the results are shown as below：①total mass concentration of different kinds of aerosol is obviously different; ②sea-fog aerosol primarily includes particles of which size ranging from 1 μm to 2. 5 μm,and refreshing aerosol,includes particles of which size less than 1 μm,and suspended dust aerosol,includes particles of which size ranging from 2. 5 μm to 10 μm. ③precipitation has important role on decreasing larger particle concentration and increasing tiny particle concentration. ④those tiny particles of which size is less than 1 μm,especially less than 0. 6 μm,show an activation phenomenon when they located before the surface weather systems,where air humidity is considerable high. ⑤trend of number concentration variability of different particles has different characteristic modes when aerosol property has been changed.