A method for calculating global downwelling longwave radiation using geostationary and polar-orbiting satellite observations

摘要

To obtain downward longwave radiation (DLR) product at high resolution and good quality, a method of calculating global DLR was proposed. Global geostationary and polar-orbiting satellite observations were used to cover the whole world, and several DLR algorithms and two atmospheric datasets were combined used to satisfy different conditions. The global DLR at 5 km was produced using Multi-source data Synergized Quantitative remote sensing production system (MuSQ). The MuSQ DLR was validated using field measurement around the world, and it had acceptable results at most sites. The uncertainty of DLR product was probably from the uncertainties of cloud detection and atmospheric parameters, and the limitation of DLR algorithms. The DLR product was compared with other radiation products, and it had much better or comparable results to current products.