Improved estimation of the global top-of-atmosphere albedo from AVHRR data

The top-of-atmosphere (TOA) albedo, a key component of the earth's energy balance, can be monitored regularly by satellite observations. Compared to previous study Song et al. (2018), this paper estimates TOA albedo directly linking Advanced Very High Resolution Radiometer (AVHRR) narrowband reflectance with broadband determined NASA's Clouds and Earth's Radiant Energy System (CERES) instead Moderate Imaging Spectroradiometer (MODIS). product developed in has an increased spatial resolution, from 1° 0.05°, its starting year been extended 2000 1981, compared CERES product. Models lands oceans are established separately under different atmospheric surface conditions using gradient boosting regression tree (GBRT) method linear models study. root mean square errors (RMSEs) cloudy-sky, clear-sky snow-cover over land 11.2%, 9.2% 2.3%, respectively; they 14.6%, 10.6% 5.6%, respectively. improvements three 28.8%, 29.2% 68.6%, product, new is much more accurate than that our global monthly differences obtained GBRT 2001 2014 mostly less 5%.