Final workshop report on results and evaluation of demonstrators (D2.1)

A workshop on the global high‐resolution demonstrators was held in conjunction with the annual meeting of ESiWACE on 11 March 2019. The results for the atmosphere‐only, oceanonly and coupled ocean‐atmosphere demonstrators were presented and discussed. All models that were involved—ICON, IFS, NEMO, EC‐Earth—could technically reach the actual resolutions that were targeted in ESiWACE. Yet, significant performance shortfalls in terms of throughput and memory or energy demands were encountered. Despite the performance shortfalls of the models, discussions on (1) the expected performance gains in the future through advanced model optimisation and the establishment of pre‐exascale and exascale supercomputers as well as (2) the great scientific relevance of global highresolution simulations have significantly impacted the global high‐resolution development process in the weather and climate community and contributed to the evolving roadmap towards global kilometre‐scale ensemble simulations.ESiWACE has received funding from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No 67519