Differences Evaluation among Three Global Remote Sensing SDL Products

At present, a variety of global remote sensing surface downwelling longwave radiation (SDL) products are used for atmospheric science research; however, there few studies on the quantitative evaluation differences among different SDL products. In order to evaluate quantitatively, we have selected three commonly products—Clouds and Earth’s Radiant Energy System-Synoptic Radiative Fluxes Clouds (CERES-SYN), European Centre Medium Range Weather Forecasts-Surface Radiation Budget (ECMWF-SRB) Global Water Exchanges Project-Surface (GEWEX-SRB)—to comprehensively study in this paper. The results show that significant some areas, such as Arctic, Antarctic, Sahara, Tibet Plateau, Greenland. maximum absolute root mean square error (RMSEab) these areas is greater than 20 Wm−2, relative (RMSEre) 20%, minimum bias (MBEab) about Wm−2 −20 respectively, (MBEre) 10% −10%, respectively. Among products, difference between ECMWF-SRB GEWEX-SRB most significant. addition, paper also analyzed based aspects. Firstly, seasonality, months may vary greatly. However, not sensitive years. Secondly, cloud-forcing radiative fluxes (CFRFs) which an important factor affecting Finally, process converting high temporal resolution into monthly data processing affects