127 Application to the Fukushima area is described in Ref. [XI-16]. The model domain covers the oceanic area o? Fukushima, i.e. 31°N–43.2°N, 137°E–150°E (1000 km × 1200 km). The horizontal resolution is 1/60° (one nautical mile), in both E-W and N-S directions, with 742 grid cells in the E-W direction and 622 in the N-S direction. The vertical resolution of the sigma coordinate is 40 layers refined near the surface. Bathymetric data are derived from the Japan Oceanographic Data Center. Wind forcing, water and heat ?ux are downscaled from the atmospheric forecast and hindcast of the NCEP meteorological global model [XI-17] with a resolution of 1/2°. At the scale of thermohaline and geostrophic e?ects, the initial and boundary conditions are derived from the daily oceanic forecast and hindcast of the global model proposed by Mercator-Ocean with a resolution of 1/12°[XI-18]. For the downscaling procedure, the temperature, salinity, currents and sea level are interpolated in both time and space to provide initial and boundary conditions. The tide at open boundary conditions is prescribed using 16 tidal harmonic components from the FES2004 numerical atlas with a horizontal resolution of 1/8°. Radionuclide dispersion is calculated using an Eulerian method. The parallelized MARS3D code runs on 256 Message Passing Interface (MPI) ranks for the present Fukushima application. An example of calculated currents is presented in Figure XI-1. FIG.XI-1. Calculated mean surface currents for April 2011. XI-7. SYMPHONIE (SIROCCO, UNIVERSITY OF TOULOUSE, FRANCE) The model used is the non-hydrostatic ocean model following the Boussinesq hydrostatic SYMPHONIE model developed by the Sirocco system team. The model uses an Arakawa type