Preprints
https://doi.org/10.5194/essd-2022-319
https://doi.org/10.5194/essd-2022-319
 
26 Sep 2022
26 Sep 2022
Status: this preprint is currently under review for the journal ESSD.

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

Ruohan Li1, Dongdong Wang1, Weile Wang2, and Ramakrishna Nemani2 Ruohan Li et al.
  • 1Department of Geographical Sciences, University of Maryland, College Park, MD 20742, USA
  • 2NASA Ames Research Center, Mountain View, CA 94043, USA

Abstract. Surface downward shortwave radiation (DSR) and photosynthetically active radiation (PAR) play critical roles in the Earth’s surface processes. As the main inputs of various ecological, hydrological, carbon, and solar photovoltaic models, increasing requirements for high spatiotemporal resolution DSR and PAR estimation with high accuracy have been observed in recent years. However, few existing products satisfy all of these requirements. This study employed a well-established physical-based look-up table (LUT) approach to the GeoNEX gridded top-of-atmosphere bidirectional reflectance factor data acquired by the Advanced Himawari Imager (AHI) and Advanced Baseline Imager (ABI) sensors. It produced a data product of DSR and PAR over both AHI and ABI coverage at an hourly temporal step with a 1 km spatial resolution. GeoNEX DSR data were validated over 63 stations, and GeoNEX PAR data were validated over 27 stations. The validation showed that the new GeoNEX DSR and PAR products have accuracy higher than other existing products, with root mean square error (RMSE) of hourly GeoNEX DSR achieving 74.3 W / m2 (18.0 %), daily DSR estimation achieving 18.0 W / m2 (9.2 %), hourly GeoNEX PAR achieving 34.9 W / m2 (19.6 %), and daily PAR achieving 9.5 W / m2 (10.5 %). The study also demonstrated the application of the high spatiotemporal resolution GeoNEX DSR product in investigating the spatial heterogeneity and temporal variability of surface solar radiation. The data product can be accessed through NASA Advanced Supercomputing Division GeoNEX data portal https://data.nas.nasa.gov/geonex/geonexdata/GOES16/GEONEX-L2/DSR-PAR/ and https://data.nas.nasa.gov/geonex/geonexdata/HIMAWARI8/GEONEX-L2/DSR-PAR/ (https://doi.org/10.5281/zenodo.7023863, Wang & Li, 2022).

Ruohan Li et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-319', Anonymous Referee #1, 17 Oct 2022 reply
  • RC2: 'Comment on essd-2022-319', Anonymous Referee #2, 23 Oct 2022 reply

Ruohan Li et al.

Data sets

A GeoNEX-based 1km hourly land surface downward shortwave radiation (DSR) and photosynthetically active radiation (PAR) product Dongdong Wang, Ruohan Li https://doi.org/10.5281/zenodo.7023863

Ruohan Li et al.

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Short summary
There has been increasing need for high spatiotemporal resolution surface downward shortwave radiation (DSR) and photosynthetically active radiation (PAR) data for ecological, hydrological, carbon, and solar photovoltaic research. This study produced a new 1km hourly data product of DSR and PAR from the new-generation geostationary ABI and AHI data archived at the NASA GeoNEX platform. Our validation indicated that the GeoNEX DSR and PAR product has accuracy higher than other existing products.