Abstract
This paper investigates the reflective mechanism in which the optical characteristics of painted-glass beads used as the soil layer model occur in the well-known albedo day variation.
ainted-glass beads used as the soil layer model occur in the well-known albedo day variation. First, the secondary reflection yielded from the beads's mutual surfaces, left as a question in the previous paper, is quantified by a conceptional examination such as the manner of ray's reflection on the beads's surface. Then, an equation with an additional term, that is the secondary reflection prescribed quantitatively, is obtained.
Second, in case of the scattering of uniform beads having relatively a large diameter to establish the same density on the surface of the uniform beads having a relatively small diameter spread all over (the surface beads having two colors and two diameters), the reflection is undergone its increase or decrease change with the increase amount of the scattered beads. However, from the stand point of its effect on albedo day variation, it is shown that this fluctuation in reflection can be ignored.,
Finally, it is concluded that even the day variation tendency of the albedo in case of such acomplicated, mixed beads surface, can be explained quantitatively and qualitatively based on the equation. In short, the albedo day variation may be ruled notably by the secondary reflection term and its content may be composed of the product-effect of the optical characteristics of the beads' surface. However this final conclusion may be different from the reflective mechanism of the soil layer.
The reflective mechanism of beads' surface layer is dominated by a mirror reflection but that ofsoil surface layer is not only by that but also by both diffuse reflection and back scattering.
