Constructing High-Resolution (10 km) Daily Diffuse Solar Radiation Dataset across China during 1982–2020 through Ensemble Model

Diffuse solar radiation is an essential component of surface that contributes to carbon sequestration, photovoltaic power generation, and renewable energy production in terrestrial ecosystems. We constructed a 39-year (1982–2020) daily diffuse dataset (CHSSDR), using ERA5 MERRA_2 reanalysis data, with spatial resolution 10 km through developed ensemble model (generalized additive models, GAM). The validation results, ground-based measurements, showed GAM had high stable performance the correlation coefficient (R), root-mean-square error (RMSE), mean absolute (MAE) for sample-based cross-validations 0.88, 19.54 Wm−2, 14.87 respectively. CHSSDR highest consistency measurements among four products (CERES, ERA5, JiEA, CHSSDR), least deviation (MAE = 15.06 Wm−2 RMSE 20.22 Wm−2) R value (0.87). values China range from 59.13 104.65 multi-year average 79.39 1982 2020. Generally, low latitude altitude regions have larger than regions, eastern has less western China. This would be valuable analyzing regional climate change, applications, resources. freely available figshare.