Résumé
This study aims at defining a method for selecting an optimal interpolated climatic dataset in thecontext of an integrated modelling of the Ebro (85 000 km2, Spain) hydro-system. Two different sets oftemperature and precipitation were chosen according to data availability criteria, and each set wasinterpolated on an 8 × 8 km grid covering the basin, with and without a monthly or annual altitudinalgradient applied by geographical area (Pyrenees, Cantabrian and Iberian ranges) over 1000 m a.m.s.l. Sevenbasins (464 to 2975 km2) representing different flow regimes of the Ebro catchment were chosen to evaluatethe performance of 24 different climatic datasets for modelling water resources. We used a conceptual model(GR4j) at a daily time step to test the sensitivity of hydrological modelling to the different sets ofprecipitation and temperature. A global score was attributed to each dataset according to the differenthydrological modelling criteria in order to discriminate the best-performing dataset.