Merging High-Resolution Satellite Surface Radiation Data with Meteorological Sunshine Duration Observations over China from 1983 to 2017

Surface solar radiation (Rs) is essential to climate studies. Thanks long-term records from the Advanced Very High-Resolution Radiometers (AVHRR), recent release of International Satellite Cloud Climatology Project (ISCCP) HXG cloud products provide a promising opportunity for building Rs data with high resolutions (3 h and 10 km). In this study, we compare three satellite based on AVHRR over China 1983 2017 direct observations sunshine duration (SunDu)-derived Rs. The results show that SunDu-derived have higher accuracy than observed at time scales month or longer by comparing products. available 1960s more 2000 stations China, which provides reliable decadal estimations However, AVHRR-based significant biases in quantifying trend 2016 (−4.28 W/m2/decade 2.56 W/m2/decade) due inhomogeneity lack information atmospheric aerosol optical depth. To adjust products, propose geographically weighted regression fusion method (HGWR) merge ISCCP-HXG merged product spatial resolution km produces nearly same as This study makes first attempt high-resolution can be downloaded freely.