Implementation of EC-Earth 10km Global Coupled ESiWACE Demonstrator and Recent Computational Improvements

In the framework of the Centre of Excellence in Simulation of Weather and Climate in Europe (ESiWACE), a ground-breaking configuration for EC-Earth - a European community Earth-System Model – has been developed. In the atmosphere, the horizontal domain is based on a spectral truncation of the atmospheric model (IFS) at T1279 together with 91 vertical levels. The ocean component (NEMO) is run on the so-called ORCA12 tripolar (cartesian) grid at a horizontal resolution of about 1/12°, with 75 vertical levels. In this talk, we will present the work done to develop this configuration, the computational challenges faced and the usage of the Barcelona Supercomputing Center (BSC) performance tools to analyse and profile the code. Finally, we will present some computational improvements regarding code execution and improved I/O management, currently developed in the Computational Earth Sciences team (CES) to increase the performance of this configuration.