SMHI seeks computational resources to execute high-resolution "what-if" scenarios for the European Digital Twin of the Ocean, focusing on long-term simulations for the North and Baltic Seas. The project involves three hindcast runs (1961–2021) and two climate projection runs (2015–2100) forced by CMIP6 data to analyze the combined impacts of climate change and anthropogenic drivers, specifically addressing eutrophication management. These simulations, which utilize a computationally intensive chain of coupled ocean–ice–biogeochemistry components, are essential for fulfilling the goals of the CodeBlue project and advancing next-generation model systems to support sustainable eutrophication management and adaptation strategies for European coastal regions.