SMHI develops and provides data on the marine environment and its effects of climate change. Such data is used by decision-makers and researchers to contribute to improved long-term marine planning, and provided to the general public through the climate scenario service . We here apply for additional computational resources for running regional CMIP6 ocean climate and nutrient scenarios. These are important to understand the impact of changing climate and other anthropogenic drivers to coastal regions and its environment. The data is produced using a method called dynamical downscaling where global climate scenarios from Coupled Model Intercomparison Project (CMIP), together with different nutrient scenarios, are refined in a chain of computations involving one or several components of a regional high resolution coupled ocean–ice–biogeochemistry system. Such a chain is generally very computational demanding and this application addresses our growing need of computational resources to explore new methods as well as progress our existing tools towards the next generation of model systems. The work will be used to fulfil the goals of project HavKlim (funded by 1:10 Klimatanpassningsanslaget from the Swedish Government). The project is closely linked to other projects such as Rivierade (funded by Horizon Europe, HORIZON-CL6-2024-CLIMATE-01-6, https://www.smhi.se/forskning/forskningsprojekt/vara-forskningsprojekt/rivierade.) and CodeBlue (funded by Horizon Europe co-funded ‘Sustainable Blue Economy Partnership’ under the intervention area Digital Twins of the Ocean, https://www.smhi.se/en/research/research-units/oceanography/research-projects/codeblue---sustainable-eutrophication-management-of-the-north-east-atlantic-ocean-and-baltic-sea).