A GeoNEX-based high-spatiotemporal-resolution product of land surface downward shortwave radiation and photosynthetically active radiation

Abstract. Surface downward shortwave radiation (DSR) and photosynthetically active (PAR) play critical roles in the Earth's surface processes. As main inputs of various ecological, hydrological, carbon, solar photovoltaic models, increasing requirements for high-spatiotemporal-resolution DSR PAR estimation with high accuracy have been observed recent years. However, few existing products satisfy all these requirements. This study employed a well-established physical-based lookup table (LUT) approach to GeoNEX gridded top-of-atmosphere bidirectional reflectance factor data acquired by Advanced Himawari Imager (AHI) Baseline (ABI) sensors. It produced product over both AHI ABI coverage at an hourly temporal step 1 km spatial resolution. were validated 63 stations, 27 stations. The validation showed that new higher than other products, root mean square error (RMSE) achieving 74.3 W m−2 (18.0 %), daily 18.0 (9.2 34.9 (19.6 9.5 (10.5 %). also demonstrated application investigating heterogeneity variability radiation. can be freely accessed through NASA Supercomputing Division portal: https://data.nas.nasa.gov/geonex/geonexdata/GOES16/GEONEX-L2/DSR-PAR/ (last access: 12 March 2023) https://data.nas.nasa.gov/geonex/geonexdata/HIMAWARI8/GEONEX-L2/DSR-PAR/ (https://doi.org/10.5281/zenodo.7023863; Wang Li, 2022).