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InAlthough reanalysis data has been widely applied over the world in the past two decades, the latest generation reanalysis, ERA5 produced by ECMWF, has not been evaluated on local scales. In this study, monthly air temperature and monthly total precipitation data from 22 meteorological stations in Fujian Province was applied to validate the reliability of ERA5 in 1979-2019. The results showed that ERA5 generally performed well in capturing temporal pattern of temperature and precipitation in Fujian Province of China. The correlation coefficient between observations and ERA5 for temperature ranged from 0.996 to 0.999. The RMSE ranged between 0.36 C and 5.49 C with an average of 1.08 C over all stations. ERA5 monthly minimum temperature, maximum temperature and mean temperatures showed the significant correlations with r2 ranged from 0.87 to 0.89. The correlation coefficient ranged from 0.6 to 0.81 with an average of 0.7 for all the stations which indicates that ERA5 captured well for annual monthly precipitation. The largest RMSE was 625.59mm found at Pucheng station. The biases ranged from -138.8mm to 529.4mm with average bias value of 148.2mm for annual precipitation. The bias difference was possible from the height differences between ERA5 grid point and height of the observation. |
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Keywords:reanalysis, ERA5, air temperature, precipitation, bias |
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