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. Over the years, higher-resolution regional climate modelsimulations have emerged owing to the large increase in computationalresources. The 12 km resolution from the Coordinated Regional ClimateDownscaling Experiment for the European domain (EURO-CORDEX) is a reference,which includes a larger multi-model ensemble at a continental scale whilespanning at least a 130-year period. These simulations are computationallydemanding but do not always reveal added value. In this study, a recentlydeveloped regular gridded dataset and a new metric for added valuequantification, the distribution added value (DAV), are used to assess theprecipitation of all available EURO-CORDEX hindcast (1989–2008) andhistorical (1971–2005) simulations. This approach enables a directcomparison between the higher-resolution regional model runs against theirforcing global model or ERA-Interim reanalysis with respect to theirprobability density functions. This assessment is performed for the IberianPeninsula. Overall, important gains are found for most cases, particularlyin precipitation extremes. Most hindcast models reveal gains above 15 %,namely for wintertime, while for precipitation extremes values above 20 %are reached for the summer and autumn. As for the historical models,although most pairs display gains, regional models forced by two general circulation models (GCMs) reveallosses, sometimes around −5 % or lower, for the entire year. However, thespatialization of the DAV is clear in terms of added value forprecipitation, particularly for precipitation extremes with gains well above100 %.

Added value of EURO-CORDEX high-resolution downscaling over the Iberian Peninsula revisited – Part 1: Precipitation