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• W4313458437 abstract "Abstract This study aims to assess the accuracy of the crop reference evapotranspiration (ET 0 CLDAS, ET 0 ERA5 ) estimated by CLDAS, ERA5 reanalysis products, as well as the quality of reanalysis weather variables required to calculate PM-ET 0 , and to achieve the application of these reanalysis products to locations where weather data quality are low or (and) weather variables are missing. For this purpose, the applicability of surface meteorological elements such as daily maximum and minimum air temperatures, relative air humidity, 2m wind speed, and shortwave radiation from the ERA5 reanalysis datasets provided by the European Centre for Medium-Range Weather Forecasts (ECMWF), and the second-generation China Meteorological Administration Land Data Assimilation System (CLDASV2.0) datasets are evaluated in China by comparison with local observations from 689 stations reported by the Chinese Meteorological Administration (CMA). Statistical statistics including percent bias (PBias), coefficient of determination (R 2 ), root mean square error (RMSE) and mean absolute error (MAE) are used to check the accuracy. The results show the highest correlation between reanalysis temperature and station observations, with a mean R 2 of 0.96,0.90 for CLDAS reanalysis maximum and minimum air temperatures and 0.87,0.84 for ERA5. For the reanalysis of estimated solar radiation and relative humidity, an overestimation trend is shown for Rs, but to a lesser degree, an underestimation trend is shown for RH. Unlike the previous reanalysis variables, the reanalysis wind speed shows a lower accuracy, and average R 2 = 0.25 (R 2 = 0.18) for CLDAS reanalysis (ERA5 reanalysis) and site observations. In addition, the accuracy of ET 0 estimated by the two reanalysis products is acceptable in China, but the spatial and temporal consistency between CLDAS estimates and site observations is higher, with mean RMSE, R 2 of 0.91,0.82 for ET 0 CLDAS and 1.42, 0.70 for ET 0 ERA5 , respectively, and the performance of describing the boundary details of the study area is better since CLDAS reanalysis products integrate terrain adjustment, the elevation of target location, wind speed, and other factors are taken into account." @default.
• W4313458437 created "2023-01-06" @default.
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• W4313458437 date "2023-01-03" @default.
• W4313458437 modified "2023-09-24" @default.
• W4313458437 title "Assessing and comparing crop evapotranspiration in different climatic regions of China using reanalysis products" @default.
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• W4313458437 doi "https://doi.org/10.21203/rs.3.rs-2413275/v1" @default.
• W4313458437 hasPublicationYear "2023" @default.
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