摘要
从兰州冬季气溶胶的实测资料出发，分析得到兰州冬季气溶胶的粒径质量谱呈双峰特征，在近地面和６００ｍ高度谱相似，而质量浓度则有明显的日变化．在假设气溶胶质量密度随粒径不变时，气溶胶近地面层的谱分布可根据其粒径质量谱的特征拟合成Ｊｕｎｇｅ谱加Ｄｅｉｒｍｅｎｄｊｉａｎ谱形式的双谱模式．气溶胶的折射率用有效媒介理论计算，计算所得兰州冬季气溶胶的平均折射指数为１．６０９－０．１５ｉ．
It is found that the aerosol size-mass distribution of Lanzhou city has a bimodal character which is similar between 600 m and surface layer by analysing the observational data, and the daily variation for overall mass concentration of the aerosol is distinct. Supposing that the mass density of aerosol is constant with size, the aerosol distribution can be fitted with bimodal spectrum model that is Junge distribution plus Deirmendjian distribution.The aerosol complex refractive index are calculated by using the effective medium theory.and the calculated average complex refractive index of winter aerosol over Lanzhou city is 1. 609-0. 15I
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1996年第1期126-132,共7页
Journal of Lanzhou University(Natural Sciences)
关键词
气溶胶
质量谱
折射率
粒子谱
大气
兰州市
aerosol mass spectrum refractive index particle size distritubtion
