南京北郊大气细颗粒物的粒径分布特征  

Characteristics of size distributions of atmospheric fine particles in the north suburban area of Nanjing.

作　　者：钱凌[1] 银燕[1] 童尧青[1] 王巍巍[1] 魏玉香[2] 

机构地区：[1]南京信息工程大学大气物理与大气环境重点实验室,江苏南京210044 [2]南京市环境监测中心站,江苏南京210013

出　　处：《中国环境科学》2008年第1期18-22,共5页China Environmental Science

基　　金：江苏省自然科学基金资助项目(BK2006226);南京市环境保护局科技项目(200609)

摘　　要：根据2006年7～12月南京北郊大气细颗粒物的观测资料．研究了粒径0．01～2．5μm颗粒物的浓度变化和粒径分布特征．结果表明，该地区大气细颗粒物数浓度比较高，达10^4个／cm^3，其中超细粒子（粒径0．01～0．1μm）对总粒子数浓度贡献较大，约占87％．夏、秋、冬季的数浓度谱分布均呈单峰型结构，峰值集中在0．02～0．05μm；大气细颗粒物数浓度在正午太阳辐射最强时达到峰值；降雨对细颗粒物的去除作用明显．夏季的超细粒子浓度最高，可能与高温、高湿的气象条件有关，同时，较强的太阳辐射也使得该季节大气细颗粒物的生成率较高．Based on observing materials of atmospheric free particles from July to December, 2006, at the north suburban area of Nanjing, the concentration changes and size distributions characteristics of these particles with sizes 0.01～2.5μm were studied. The particle number concentration was quite high relatively in this region, reaching 10^4/cm^3, in which, ultra fine particles （size 0.01～0.1μm） contribution was great relatively to the total particle number concentration, occupying about 87%; the number concentration spectrum distribution in summer, autumn and winter all appeared single peak type structure, the peak value was concentrated in 0.02-0.05μm; the number concentration of atmospheric fine particle reached the peak value in noon solar radiation strongest, the precipitation process on the removing action was obvious. The ultra free particle concentration was highest in summer, this might be related to the meteorological condition of high temperature, high humidity, meanwhile, stronger solar radiation could also make the producing rate of this seasonal atmospheric fine particles higher.

关 键 词：大气细颗粒物 数浓度 粒径分布 气象因子 

分 类 号：X131.1[环境科学与工程—环境科学]