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Flux and Particle-size Distribution of Airborne Dust during Winter Seasonin Different Functional Zones of Nanjing

NI Liu-jian~(1,2),ZHANG Gan-lin~2,ZHOU Li-xiang~1(1.College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China;2.State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)  
Six typical functional zones,namely as steel industry,industrial and residential mixed zone,road side,inner residential area,scenery site and suburbs in Nanjing,Jiangsu Provinec,China were selected for airborne dust collection.Dust deposition rates and particle-size were analyzed and calculated.The results indicated that the deposition fluxes varied in range of 3.58~65.53(g/(m~2·month)) from November to March.The number-size distribution in the deposition exhibited a unimodal distribution pattern with the peak in the 0.05~0.20μm.However,the volume-size distribution of industry zone,with a higher peak in 10~50μm range and a lower peak in 100~500μm range,was the same with industrial and residential mixed zone;but the other zones displayed unimodal distribution pattern with the peak in 10~50μm range.From making a comprehensive view it was found that the natural airborne dust of a city reflected the atmospheric particle background characteristics of the deposition areas and the influence of the regional human activity and atmospheric circulation in low altitude air,and the effects of regional human activity especially in industry and road were more than atmospheric circulation.
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