对白天天空背景亮度进行了数值实验; 模拟了不同标高下的气溶胶垂直分布对天空背景亮度的影响; 比较了不同垂直分层和整层均匀气溶胶分布下, 天空背景亮度的相对偏差, 并分析了天空背景亮度对地表反射率的敏感性。结果表明: 给定气溶胶光学厚度下, 不同标高的垂直分布得到的天空背景亮度差别很大; 天空背景亮度对地表反射率和气溶胶总光学厚度都比较敏感, 敏感程度受太阳-观测几何的影响。

Numerical experiments have been conducted to simulate the sky background brightness for various aerosol scale heights in order to study the effect of vertical distribution of aerosol on the sky background brightness. A homogeneous model and a vertically inhomogeneous distributed model are utilized to estimate the sky background brightness under the conditions of different ground surface reflectances. The relative differences of sky background brightness as well as the sensitivity of sky background brightness to ground surface reflectance are also shown. The results indicate that the sky background brightness is much different under various aerosol scale heights for given aerosol optical thickness and ground surface reflectance. Moreover, the sky background brightness is also sensitive to the ground surface reflectance and aerosol optical thickness, and the degree of sensitivity is dependent on solar-observation geometry.