Concentration Characteristics of Atmospheric Aerosols in Northern China in Spring

This paper presents analysis of aerosol concentration characteristics,spatial distribution,and particle size similarities and differences in three typical regions in northern China based of aerosol observation data from ten sites in spring of 2008 and 2009.Using aerosol and meteorology data,the impact of dust-sand weather on TSP mass concentration and its variation in the observation sites are discussed.The research results show that the TSP mass concentration was the highest at the northwestern regional sites,reaching 0.488 mg/m3.Dust-sand and soil coarse mode particles were the primary components,with a proportion of 50.7%.The TSP mass concentration was 0.350 mg/m3 at the northern regional sites,at which the TSP was mainly composed of PM2.5,dust-sand and soil coarse mode particles,which accounted for 55.7% and 30.9%,respectively.The TSP mass concentration was the lowest at the Beijing regional sites,with average value 0.252 mg/m3.PM10 mass concentration was higher,reaching 94.4% of TSP,of which 54.7% was PM2.5.In addition,the intensity and frequency of dust-sand weather had significant impacts on annual variation of aerosol concentration,and weather played an important role in the emergence of dust-sand weather.