EAMxx Decadal Run
The C++/Kokkos rewrite of the atmosphere model has now enabled km-scale simulations that are long enough to start informing infrastructure planning. After completing the EAMxx (E3SM Atmosphere Model in C++), the team has worked over the past three years to scale up the simulation length of the global 3km version of EAMxx, the Simple Cloud Resolving E3SM Atmosphere Model (SCREAMv1). Beginning with the four 40-day simulations of the ‘Four Season’ simulations, the next set of experiments featured two pairs of 13-month simulations to investigate atmospheric feedbacks and aerosol-cloud interactions at 3km.
Figure 1. Tropical cyclone tracks in EAMxx.
Just this past month, the team reached a major milestone of completing a 10 year simulation with SCREAMv1. Running on Frontier, the world’s first exascale computer, the simulation averaged a throughput of 0.34 simulated years per day (SYPD) on 2048 nodes (roughly 20% of Frontier) and was shepherded through multiple machine updates and maintenance over the course of 10 months. This simulation provides unprecedented data for scientific explorations to improve the understanding of the nature and statistics of weather events that cause power outages, which are critical for energy infrastructure and national security. Tropical cyclones are one such example (Fig.1, Fig. 2).
Figure 2. Tropical cyclone generated in EAMxx.
Analysis of the simulation output has just begun, so stay tuned for the next newsletter update with new findings from the simulation.
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