Historical: ERA5 data have been compared to previously used ERA-Interim for consistency.

Seasonal Forecasts: forecast skill, such as measured by anomaly correlation, is performed and will be provided via the C3S Energy demonstrator. Maps representing the bias for different time- periods for each system are also provided, as well as graphs comparing hindcast dataset before
and after bias-correction.

Projections: a "health check" procedure was applied on bias adjusted data to verify:

• that the bias adjusted projections had similar seasonal means over the reference periods; by mapping the absolute differences, it was found that they are an order of
  magnitude smaller than the variables variations. 
•  that the changes between end of current and past centuries were similar with or without bias adjustment. We found that while the general patterns were quite similar, changes amplitudes can be modified by the CDFt method.