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This manuscript was handled by model-based projections are affected by considerable uncertainties. They originate from the driving cli-mate model, input data quality, and simplifications in the glacio-hydrological model and hamper the reli-Numerous model studies for a wide range of climatic settings have been performed, estimating future trends in the hydrology of glacierized basins (e.g., Juen et al., 2007; Stahl et al., 2008; We-ber et al., 2010; Hagg et al., 2013; Bavay et al., 2013; Ragettli et al., 2013). As a robust result, a shift in the runoff regime and a decrease in melting season discharge is found on the long run. However, an require a careful ertainties of adaptat Several individual components of the uncertainty in glaci off projections have recently been assessed. The impact of ences in air temperature and precipitation trends projected by Regional Climate Models (RCMs) or Global Circulation Models (GCMs) on the runoff regime of glacierized catchments was ad-dressed in different regions (e.g., Stahl et al., 2008; Farinotti et al., 2012; Lutz et al., 2013; Ragettli et al., 2013). Dedicated stud-ies have investigated the effect of climate model data downscaling procedures on calculated glacier mass balance (e.g., Radic ́ an