
This program presents a new hydrological reference dataset designed to address the need for integrated terrestrial Essential Climate Variables (ECVs). It highlights the importance of collaboration between the Earth Observation (EO) and Land Surface and Hydrologic Model (LSM/HM) communities to develop consistent ECVs at regional and continental scales. A crucial step in this process is understanding and assessing the uncertainties associated with LSM/HM simulations. The dataset includes a range of 19 existing LSM/HM simulations, representing the current state-of-the-art in modeling. These simulations are provided on a daily time step and cover continental Europe, with specific focus on the Rhine and Po river basins. It also includes an African basin for broader comparative analysis. This initiative aims to provide a foundation for more unified and reliable climate variable assessments.