Source Code and Modelling Workflow for European-Scale Simulations Using EcoTWIN v1.0

This repository provides the source code, simulation outputs, documentation, and supporting materials of the European-scale EcoTWIN v1.0 simulations presented in Wu et al. (2026). The repository includes: EcoTWIN v1.0 source code – The C++ source code of EcoTWIN v1.0. User Guide and Modelling Workflow – Detailed documentation of model inputs, configuration, parameterization, and execution, together with supporting resources used in Wu et al. (2026). European-scale simulation outputs – Gridded simulation results at 5-km spatial resolution. Figure reproduction scripts – A Python script for reproducing the main figures presented in Wu et al. (2026) For instructions on the repository, please refer to the README file. For instruction on modelling workflow of EcoTWIN v1.0, please refer to EcoTWIN_documentation.md. All materials are openly accessible under the CC BY-NC 4.0 license. If you use these assets, please cite: Wu, S., Soulsby, C., Zheng, Y., Musolff, A., & Tetzlaff, D. (2026). Divergent evolution of nitrogen cycling along gradients of landscape water velocities. Science, 392(6803), 1188–1193. https://doi.org/10.1126/science.aed0399