Coupling a global glacier model to a global hydrological model prevents underestimation of glacier runoff

Abstract. Global hydrological models have become a valuable tool for range of global impact studies related to water resources. However, glacier parameterization is often simplistic or non-existent in models. By contrast, do represent complex dynamics and evolution, as such, they hold the promise better resolving runoff estimates. In this study, we test hypothesis that coupling model with leads more realistic representation and, consequently, improved predictions model. To end, Glacier Evolution Model (GloGEM) coupled PCRaster GLOBal Water Balance model, version 2.0 (PCR-GLOBWB 2), using eWaterCycle platform. For period 2001–2012, evaluated against uncoupled PCR-GLOBWB 2 25 large-scale (>50 000 km2), glacierized basins. The produces higher estimates across all basins throughout melt season. summer, differences from 0.07 % weakly glacier-influenced 252 strongly difference can primarily be explained by not accounting flow mass loss, thereby causing an underestimation runoff. performs reproducing basin observations mostly basins, which where has most impact. This study underlines importance demonstrates potential