Evaluation and intercomparison of multiple satellite-derived and reanalysis downward shortwave radiation products in China

Downward shortwave radiation (DSR) is a critical variable in energy balance driving Earth's surface processes. Satellite-derived and reanalysis DSR products have been developed and continuously improved during the last decades. However, as those products have different temporal resolutions, the...

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Bibliographic Details
Published in:International journal of digital earth 2023-12, Vol.16 (1), p.1853-1884
Main Authors: Tong, Liu, He, Tao, Ma, Yichuan, Zhang, Xiaotong
Format: Article
Language:English
Subjects:
Accuracy
CERN
Downward shortwave radiation
Earth surface
Energy balance
Global weather
Intercomparison
Monthly
Numerical prediction
product validation
Radiation
reanalysis products
remote sensing products
Root-mean-square errors
Satellites
Short wave radiation
Time
Weather forecasting
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Summary:Downward shortwave radiation (DSR) is a critical variable in energy balance driving Earth's surface processes. Satellite-derived and reanalysis DSR products have been developed and continuously improved during the last decades. However, as those products have different temporal resolutions, their performances in different time scales have not been well-documented, particularly in China. This study intended to evaluate several DSR products across multiple time scales (i.e. instantaneous, 1-hourly, daily, and monthly average) and ecosystems in China. Six DSR products, including GLASS, BESS, CLARA-A2, MCD18A1, ERA5 and MERRA-2, were evaluated against ground measurements at Chinese Ecosystem Research Network (CERN) and integrated land-atmosphere interaction observation (TPDC) sites from 2009 to 2012. The instantaneous DSR of MCD18 showed a root mean square error (RMSE) of 146.02 W/m 2 . The hourly RMSE of ERA5 (155.52 W/m 2 ) was largely smaller than MERRA-2 (188.53 W/m 2 ). On the daily and monthly scale, BESS had the most optimized accuracy among the six products (RMSE of 36.82 W/m 2 ). For the satellite-derived DSR products, the monthly accuracy at CERN can meet the threshold accuracy requirement set by World Meteorological Organization (WMO) for Global Numerical Weather Prediction (20 W/m 2 ).
ISSN:1753-8947
1753-8955
DOI:10.1080/17538947.2023.2212918