地表反射太阳辐射的参数化计算方法  

Parameterized model of solar radiation reflection by the ground

作　　者：杨春平[1] 吴健[1] 冷杰[2] 

机构地区：[1]电子科技大学光电信息学院,成都610054 [2]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《强激光与粒子束》2007年第2期215-218,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金委-中国工程物理研究院联合基金资助课题(10376007)

摘　　要：从能量守恒定律出发,建立了朗伯地表对下行辐射的反射作用引起天空亮度变化的解析计算模型。利用射线追踪原理,提出了地表与大气之间多次反射作用的理论模型。引入了一个多次散射的影响因子,并对附加的天空亮度进行了修正。利用混合修正的δ-Eddington近似和互易性原理计算了大气的透射率、反照率以及半球平均反照率。最后计算了地表反照率分别为0.15,0.25和0.35情形下的天空亮度增量,实验测量数据证实了这些结果。结果表明:当地表的反照率不为0时,存在“临边增亮”效应,并且随着地表反照率的增大,这种效应更加明显。It is important to evaluate sky radiance for a ground-to-air measurement system. Based on energy conservation law and the assumption that the underlying surface is a Lambert＇s surface, a model was developed to calculate the additional sky radiance due to the ground reflectance. According to the ray trace principle, multiple reflectance between the earth＇s albedo surface and the atmosphere was also taken into account. The hybrid modified deltaoEddington approximation was used to calculate the transmission, reflection and average reflection of the atmosphere from the ground to the top of the atmosphere. The additional sky radiance was calculated under surface albedos of 0.15, 0.25 and 0.35, and compared with the measured data. The results show that there is a limb-brightening effect for sky radiance, i.e. it rapidly rises while viewing zenith angle approachs 90°,and the larger the albedo of the earth＇s surface is, the more marked this effect appears.

关 键 词：地表 太阳辐射 反射 天空亮度 互易性原理 朗伯定律 

分 类 号：TN011[电子电信—物理电子学]