首页 | 本学科首页   官方微博 | 高级检索  
     检索      

能见度分级约束下的大气气溶胶光学厚度特征
引用本文:李放,吕达仁.能见度分级约束下的大气气溶胶光学厚度特征[J].中国环境监测,1996(6).
作者姓名:李放  吕达仁
作者单位:中国科学院大气物理研究所
基金项目:国家自然科学基金,中国博士后科学基金
摘    要:利用PIS太阳光谱仪观测了北京地区1993年3月—1995年3月晴天和少云天气的太阳直接辐射光谱,波长范围为0.40-1.04μm。光谱分辨率1.25nm,共有1064组数据。观测期间,将地面能见度分为五级。由太阳直射谱获得了各能见度下大气气溶胶光学厚度谱。研究表明,北京地区大气气溶胶光学厚度虽然其总体季节统计规律为春夏大,秋冬小,然而,当加入能见度分级约束后,各能见度下气溶胶光学厚度的季节变化,近于消失。这表明少数“反常”垂直结构不影响能见度分级的平均结果。而不分级的光学厚度季节起伏主要由各季节的几率能见度决定。文中还把年平均五种能见度下的光谱光学厚度与LOWTRAN模式作了对比。由光学厚度谱反演出了气溶胶粒子谱分布,为建立我国北方局地气溶胶模式构造了基本框架

关 键 词:能见度,气溶胶,光学厚度,直接辐射

Features of the aerosol optical depth of Beijing under the classification of the surface visibility.
Li Fang et al.Features of the aerosol optical depth of Beijing under the classification of the surface visibility.[J].Environmental Monitoring in China,1996(6).
Authors:Li Fang
Abstract:The observation of direct solar radiation in urban district of Beijing was carried out with a PIS spectrometer from March 1993 to March 1995.The aerosol spectral optical depths are deduced from the radiation data.The results show that the seasonal mean aerosol optical depth is larger in spring and summer,smaller in autumn and winter.It is found that the aerosol spectral optical depth is closely related to surface visibility.For the same visibility level,it has very weak seasonal variation.This means the seasonal variation of the aerosol spectral optical depth is mainly determined by the variation of surface visibility.The yearly averaged aerosol optical depth spectra under the various visibility levels are given and the comparison with the calculation from an aerosol model of LOWTRAN 7 are made at the same visibility level.The particle size distributions are retrieved from observed aerosol optical depth spectra.
Keywords:atmospheric aerosol  visibility gradation  optical depth  direct solar radiation
本文献已被 CNKI 等数据库收录!
点击此处可从《中国环境监测》浏览原始摘要信息
点击此处可从《中国环境监测》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号