A Parameterization Method for Retrieving Surface UVB Radiation from Satellite
卫星遥感地面紫外辐射的参数化方法

A new parameterization method for retrieving surface UVB irradiance and erythemal UVB radiative dose rate is presented. This method is based on a simple concept: the earth-atmosphere system can be equivalent to three layers: absorption layer by ozone, scattering layer containing air molecules, cloud and aerosol particles, and the surface reflecting. The surface UVB irradiance and erythemal UVB dose rate can be expressed by the effective transmission of the ozone layer and united reflectivity due to the scattering layer and the surface. The effective ozone transmission is calculated from the atmospheric total ozone amount, while the united reflectivity is determined from the satellite measured reflectivity at ozone insensitive ultraviolet or visible band. The retrieval method is simple with some parameters, which can be determined from satellite observations. The comparison of this method with an accurate DISORT-based radiative transfer model has been done. Small differences are shown for wide atmospheric conditions including clear, cloudy sky and turbid atmosphere. An actual application has been Performed using satellite observations, and the results are compared with the surface observations. And the two are in a good agreement.