摘要
2005年5月17日-5月24日在天津市大气边界层梯度观测站对大气中气溶胶粒子的数浓度进行了观测,换算出粒子表面积浓度和体积浓度,分析了各自在不同粒径段的分布特征,结果表明:天津初夏气溶胶数浓度谱属于双峰型,主峰中心位于0.3μm左右,粒径在0.25～0.6μm之间的粒子占总数的98.5%,积聚模态在分配水平上占绝对优势;表面积浓度谱呈现我国城市3峰特征,体积浓度谱在0.30～0.35μm粒径段出现一个明显的峰。并且根据气溶胶粒径分布的数浓度谱的特征在3个区间分别采用Junge谱、Deirmendjian谱的模式来拟合出天津初夏大气气溶胶粒子粒度谱分布函数表达式。
The number concentrations of atmospheric aerosol particles were measured at the atmospheric boundary vertical monitoring site in Tianjin from May 17,2005 to May 23,2005.The surface concentrations and the volume concentrations were converted from the number concentrations.Analysis results of the distribution characteristics of different size ranges indicated that the size distribution of aerosol number concentration showed a bimodal shape with the main peak at 0.3 μm in diameter.Aerosol particles with the diameter ranging from 0.25 to 0.6 μm took up 98.5% of the total number concentration,the accumulation mode particles took the dominant place.Surface concentration distribution presented a trimodal shape of Chinese cities,and the volume concentration distribution presented a clear peak from 0.30 to 0.35 μm.Finally,the functional expression of aerosol size distribution in Tianjin during early summer could be fitted in three intervals respectly with the models of Junge spectrum and Deirmendjian spectrum.
出处
《城市环境与城市生态》
CAS
CSCD
2007年第5期1-5,共5页
Urban Environment & Urban Ecology
基金
国家自然基金项目(20677030)
天津市科技研发项目(06YFSYSF02900)
关键词
大气气溶胶
数浓度
粒度谱分布
拟合
atmospheric aerosol
number concentration
size distribution
numerical fitting
