An ensemble of daily simulated runoff data (1981–2099) under climate change conditions for 93 catchments in Switzerland (Hydro‐CH2018‐Runoff ensemble)

We present a new ensemble of daily runoff simulations for meso-scale catchments in Switzerland for the period 1981-2099: The Hydro-CH2018-Runoff ensemble. The ensemble contains runoff simulations for 93 catchments in Switzerland covering a wide range of different catchment characteristics governed by pluvial, nival and glacial runoff regimes. The hydrological modelling system PREVAH was thoroughly calibrated and validated for each catchment. The simulations show satisfactory performance with a median Nash-Sutcliffe efficiency of 0.82 in the calibration and validation period. The calibrated parameters were then used to simulate runoff under climate change for each of the 93 catchments. These simulations were driven by the high-resolution new Swiss climate change scenarios (CH2018) consisting of 68 GCM-RCM combinations covering 3 different emission scenarios: RCP2.6, RCP4.5 and RCP8.5. The simulations show good agreement between simulated and observed runoff regimes in the reference period. The Hydro-CH2018-Runoff ensemble is publicly available under (Muelchi, R., Rossler, O., Schwanbeck, J., Weingartner, R., and Martius, O. (2020) Hydro-CH2018-Runoff ensemble (version v1). Zenodo) and can be used for further impact studies.