兰州市春季沙尘气溶胶的监测与分析  

Monitoring and Analysis of the Atmospheric Dust and Aerosol Over Lanzhou City in Spring

作　　者：雷洋[1] 袁九毅[1] 奚晓霞[1] 刘远永[1] 仝纪龙[1] 

机构地区：[1]兰州大学大气科学学院,兰州730000

出　　处：《干旱区资源与环境》2008年第9期65-70,共6页Journal of Arid Land Resources and Environment

基　　金：兰州市科技计划资助项目(06-1-53)资助

摘　　要：通过对兰州市2005年春季大气气溶胶监测资料的计算,分析得到了该地区春季大气气溶胶质量浓度和色度随时间的分布及其相互关系,结果表明:有大风时,沙尘浓度较高,红度、黄度也高,相应地污染物比例就小,明度就高;有降水、阴天和多云天气时,空气中沙尘和污染物少,明度高,而沙尘和污染物的比例变化比较小,所以红度和黄度也高;无降水且风速小时,污染物比例大,则明度低,相应地沙尘比例小,红度、黄度也低。本文还分析计算了沙尘暴发生时沙尘粒径的分布、PM10和PM2.5的质量分数以及PM2.5在PM10中的比重;粗细粒子比重不同说明沙尘来源不同。The atmospheric aerosol and dust - stormy weathers in Lanzhou City in Spring of 2005 were monitored. In this research the atmospheric aerosol samples were analyzed. The distribution of the mass concentration and color index of atmospheric aerosol were obtained. The largest average mass concentration of TSP was 1. 8881mg/m^3 from March to April. The relationship between the chroma and the mass concentration under the different weather condition was revealed. During the study of the mass concentration of PM10 and PM2.5 particles by Anderson and KB- 120E cascade under duststormy weather, 7th April for example, the distribution law of size grade of PM10 ,the proportions of PM2.5 over PM10 were got. The average mass concentrations of 100μ m and 10μm granules were 1. 7011 mg/m^3 and 1. 1043mg/m^3 respectively. It was concluded that air pollution of cold weather in Lanzhou City is mainly caused by coal combustion and tail gas from cars and sometimes by dust, too. The different size granule distribution may had different sources.

关 键 词：气溶胶 TSP 质量浓度 飘尘(IP) PM10 PM2.5 粒径 色度 

分 类 号：P445.4[天文地球—大气科学及气象学]