Evaluation of river discharge simulated with CTRIP forced by the CERRA-Land regional reanalysis over Europe.

The study and understanding of the water cycle is vital, and especially significant due to challenges like climate change and effective water management, among others.  

The work herein presents a comparison designed in such a way that it covers different spatial scales (at European, basin, and gauging station levels), as well as providing results that offer a characterization of discharge as complete as possible. For this, standard and well known metrics, like NSE and KGE are given, but also low, medium, and high flows are considered through percentile analysis and specific metrics.

 

Observations used in this study belong to the Global Runoff Data Centre (GRDC), which provides data over the globe, and French and Spanish public databases. An offline simulation of the CTRIP routing model was used to simulate river discharge over the period 1993 to 2019. It was forced with surface and subsurface runoff from the CERRA-Land European regional reanalysis at a spatial resolution of 5.5 km.

This study is conducted within the framework of the CERISE project (grant agreement No101082139). The results will enable us to evaluate the hydrological quality of the CERRA-Land reanalysis. Additionally, our contributions aim to enhance future reanalyses, thereby improving the next generation of Copernicus Climate Change Service (C3S) Earth system reanalyses.