ESiWACE: On European Infrastructure Efforts for Weather and Climate Modeling at Exascale

Kilometer-scale ensemble simulations are expected to significantly boost and impact weather and climate predictions in the future. However, these simulations will only be enabled by exascale compute power and corresponding data capacity. In the following, we discuss a European effort in terms of the e-infrastructure Centre of Excellence in Simulation of Weather and Climate in Europe (ESiWACE). ESiWACE provides infrastructural means to prepare the weather and climate communities for simulations at the exascale. We give an overview of several ESiWACE infrastructure components and discuss their role in reaching the goal of kilometer-scale ensemble predictions. We particularly review the outcomes of the ESiWACE demonstrators, that is community-driven kilometer-scale models that have been developed throughout the last years.