昆明冬季地面生物有效紫外辐照度的理论与实测研究(Ⅰ)

A Study of Theory and Observation on the Surface Biologically active UV Irradiance for Kunming in Winter(Part Ⅰ)

依据已建立的昆明紫外辐射传输方案 ,计算并讨论了直接太阳紫外辐射漫透射率、漫反射率和单次散射反照率随垂直高度及波长的变化情况 .研究结果表明在考虑臭氧吸收和空气分子散射的情况下 ,对漫透射率而言 ,臭氧的吸收作用是主要的 ,同时分子散射也有较大影响 .而漫反射率受到低层分子散射的作用更为明显 .此外 ,波长较短的紫外辐射更易受到大气的消减 .

Based on the model calculating,the surface biologically active UV irradiance for Kunming,the variation of forward difusion transmissivity and backward reflection with the changing of height and wavelenth are discussed.It has been indicated that the variation of diffuse transmissivity and diffuse reflection are strongly related to the concentration of ozone and atmospheric molecule.Furthermore,the radiation of shorter wave tends to be cut by the atmosphere.