Fig. 2.

Evaluation metrics of the wind speed. (a) Shading indicates the correlation coefficient between ERA5 and CWA Green Energy Data. The numbers indicate the correlation of ERA5 with the observed wind tower data (green cross). Red colors indicate correlations higher than 0.8. The daily averaged data is from 2018 to 2022, spanning six years. (b) Similar to (a) but with a smaller domain outlined by the black box in (a) and using longer period from 2007 to 2022, covering 16 years for textual information. Missing data from the wind tower is excluded from all calculations. (c) Shading shows the Mean Absolute Error (MAE) between ERA5 and CWA Green Energy Data. (d) Shading represents skill scores between ERA5 and CWA Green Energy Data. A skill score of 1 indicates an identical match between the two datasets.