利用消光谱反演气溶胶复折射率的一种新方法及其应用  

A New Method of Retrieving Complex Refractive Index of Atmospheric Aerosols from the Spectral Extinction and Its Application

作　　者：李放[1] 吕达仁[1] 

机构地区：[1]中国科学院大气物理研究所

出　　处：《遥感技术与应用》1995年第2期1-8,共8页Remote Sensing Technology and Application

基　　金：国家自然科学青年基金;中国博士后基金

摘　　要：在仅有消光信息可利用的大气气溶胶观测资料处理过程中，需要寻找一种合理的反演复折射指数的方法。通过理论分析认为，Ｆｙｍａｔ消光比方法有潜在的反演不稳定性，经多种粒度谱的数值试验分析，认为消光比方法反演大气气溶胶复折射率，仅对特殊粒子谱型较为有效，而消光差方法却表现出适用谱分布广和具有良好精度的特点。用此方法反演出了中国科学院长春净月潭遥惑试验场１９９０年和１９９１年不同能见度下大气气溶胶的复折射率。对大气辐射传输计算，地物遥感大气订正，气溶胶的气候效应研究方面有参考价值。In the processing of atmospheric aerosol observations from the information of spectralextinction is only available,It is necessary to find a reasonable method of retrieving com-plex refractive index. This paper presents from theoretical analyses that there is a potentialinstability in Fymat’s extinction ratio method for the retrieval purpose. It is shown by thenumerical test with various aerosol size distribution that the extinction ratio method for re-trieving the refractive index is valid only for some particular types of the size distributions,and a new one,extinction difference method,presented in this paper however,can be appli-cable with broad sorts of aerosol size distributions and can work in good precision. As anexample of application,the extinction difference method is used to retrieve the complex re-fractive index of real atmospheric aerosols on certain visibility levels in 1990 and 1991 ob-served in Changchun Jingyuetan Remote Sensing Test of Academia Sinica. The resultswould be of particular value for researches in atmospheric radiation transfer model,atmo-spheric correction in remote sensing of earth surface,and the effect of atmospheric aerosols on climate.

关 键 词：气溶胶 折射指数 反演 消光谱 大气溶胶 

分 类 号：P421.2[天文地球—大气科学及气象学]