作　　者： ; ; ;

机构地区： 南京农业大学资源与环境科学学院

出　　处： 《城市环境与城市生态》 2006年第2期27-29,41,共4页

摘　　要： 选择南京市的钢铁工业区、工业与居民混合区、交通干道、居民生活区、风景区、城市郊区等6种典型城市功能区,定期收集降尘并对冬季降尘样品进行了沉降通量的计算和粒度的测定。结果表明,2004年12月份到2005年3月份期间南京市降尘沉降通量在3.58~65.53 g/(m2.月)之间变化。不同功能区降尘中颗粒物的数量-粒度都呈单峰分布,峰值为0.05~0.20μm。体积-粒度呈双峰和单峰分布,其中工业区和工业混合区呈双峰分布,主峰为10~50μm,次峰为100~500μm;其他功能区成单峰分布,峰值为10~50μm。分析得出,城市内的正常降尘反映了沉积区域上空大气颗粒物的背景特征和区域人类活动与低空大气环流相互叠加作用对降尘事件的影响,而区域人类活动特别是工业和交通的影响超过了大气环流的贡献。 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.

关 键 词： 城市功能区 大气降尘 沉降通量 粒度分布

领　　域： [环境科学与工程]