SEDNA-DELTA

Overview:

The SEDNA configuration has been developped within the ImMEDIAT project framework (French ANR funding). The project main purpose is to understand the role of ocean and sea ice small scale features in the Arctic. The SEDNA-DELTA experiment relies on the NEMO numerical plateform; it uses both NEMO-OCE and NEMO-SI3 models for the ocean and the sea ice components respectively. It aims at simulating the ocean/sea-ice dynamics over the north Atlantic ocean (from ~54°N), the Greenland-Iceland-Norway seas and the whole Arctic basin with a limit along the Bering strait. The SEDNA-DELTA experiment required more than 35 Mhours of computing ressources attributed after a Peer Review Process by the PRACE consortium (funding from the EU’s Horizon 2020 Research and Innovation Programme) for one year. The run has been performed on the Joliot-Curie HPC computer hosted by the TGCC.

• Main technical aspects hereafter:
  ** The horizontal grid is a 1/60 degree i.e. from ~1km at the southern limit down to ~800m in most of the Arctic basin. The grid domain has more than 6 billion grid points.
  ** A 150 vertical levels from 1m close to the surface up to 100m at the ocean bottom.
  ** The model time step is ∆t=40s.
  ** The SEDNA-DELTA experiment covers the range 2009-2015 and has been forced with the ERA5data set.
  ** A total of 17404 CPUs have been mobilised for the simulation with respectively 16860 CPUs for NEMO and 544 CPUs dedicated to XIOS servers.

Source code as input files required to perform the SEDNA-DELTA experiment that relies on the NEMO release 4.0.5