Shengcheng Cui
Chinese Academy of Sciences
China
Title: A new land surface albedo model for better characterizing surface reflective properties
Biography
Biography: Shengcheng Cui
Abstract
Land surface albedo (LSA) provides a unique interface for the coupled surface-atmosphere system (CSAS). It serves as an essential analysis tool for the surface energy balance and plays an important role in various aspects involving the state and evolution of CSAS. A new LSA model was constructed to improve the characterization of the surface reflectivity properties. This model took the real angular distribution of diffuse sky irradiance field and the multiple-reflecting effect between the surface and the atmosphere into account. The model has advantage in accuracy when the sun is located higher than 50 degrees. Satellite observed surface reflectance anisotropy and albedo is strongly affected by solar illumination angles and atmospheric conditions. A parameterization of LSA was conducted and tabulated into lookup tables (LUT) with respect to two variables – solar zenith angle (SZA) and aerosol optical depth (AOD). With the developed LSA model and the parameterized LSA LUTs, it is expected that users can easily make a fast yet accurate albedo calculations after successfully inverting surface bidirectional reflectance distribution function (BRDF) model. It is promising for in-situ truth validation against satellite-derived land surface parameters products and also useful for any radiative transfer problems in the CSAS.