2 Methodology
We start with a brief introduction of our hydrological climate model system and the implemented hierarchical framework for uncertainty quantification in Section 2.1. The multiple alternative GCMs, GGESs, and two different hydrological models with their uncertainty parameters used in this study are described in the following Sections 2.2 and 2.3. Then, the new sensitivity index system and the estimation processes are described in the last Sections 2.4 and 2.5.