ICON-ART is a new advanced chemistry transport model coupled to the numerical weather prediction model ICON (ICOsahedral Nonhydrostatic Model) that was developed primarily by the Deutscher Wetterdienst (DWD) and Max Planck Institute for Meteorology (MPI-M). The ART extension for Aerosols and Reactive Trace gases was developed at the Karlsruhe Institute of Technology (KIT) and is an official component of ICON.In a new project under the Swiss Platform for Advanced Scientific Computing (PASC), we aim to develop a computationally highly efficient version of ICON-ART, optimized for the next generation supercomputing systems. For this purpose, large parts of ART will be ported to GPUs based on OpenACC directives. This will enable integrating ART into an already existing GPU-accelerated version of ICON.We will closely collaborate with out project partners at KIT, ETH Zurich, the Swiss National Supercomputing Center, and with the EXCLAIM project at ETH. We will build on our extensive expertise, acquired during the porting of the previous numerical weather prediction model COSMO.Your tasksPorting of selected ART components to GPUs using OpenACC directives.Setting up a testbed environment, evaluate and optimize the ported components.Identify I/O bottlenecks and optimize ICON-ART for I/O.Prepare and benchmark ICON-ART for selected target applications and demonstrate the new possibilities (e.g. in terms of resolution) offered by the efficient code.Participate in project meetings, manage Empa's tasks and deliverables in the project.