In this project we will prepare, test and run the Earth System Models NorESM, EC-Earth and WACCM. We will also use the project to run simulations with the cloud resolving model MIMICA and the chemical transport model TM5. This will be done to investigate aerosol impact on clouds and climate. The project will be used by the researchers within at the Physics Department in Lund University that work with any of the models mentioned above. This model work is part of several different research projects funded by FORMAS, VR and Horizon Europe.