eNEATL36-BIzoo (BIscay Zoom) Demonstator

This page describe the way to build a global 1/36° regional configuration other the North-East Atlantic (eNEATL36) with an embedded 1/108° AGRIF zoom. It regroups:

• The eNEATL36 + BIZoo namelists and sources
• Some useful tools to create an AGRIF configuration from scratch, such as:
  • A tool to make the NEMO4.X coordinate file (domain_cfg.nc) compatible with the ifremer BMG tool (https://mars3d.ifremer.fr/Les-outils/BathyMeshGridTOOLS) in order to correct the bahtymetry manually.
  • A tool to move the runoffs along a new coastline, and to extrapolate them on a higher resolution grid (in a nesting context).
• A wiki that details how to create an AGRIF configuration from scratch, and how to use the tools.

Description

• Number of grid points : 9 321 751 (1294 * 1894 = 2 450 836 points for eNEATL36 plus 2559 * 2685 = 6 870 915 points for the AGRIF zoom).
• eNEATL36 : lon_min = -19,91° ; lon_max = 22,67° ; lat_min = 26,10° ; lat_max = 64,15°
• Zoom : lon_min = -11,86° ; lon_max = 11,29° ; lat_min = 33,66° ; lat_max = 56,70°
• Target period : Jan 2017 - June 2018

Status

The eNEATL36-AGRIF configuration has been tested in NEMO4.2 over a smaller zoom in the bay of biscay. The system is currently transferred on the target zoom area (contoured in red in Figure 1.)

Figure : Snapshot of the surface current vorticity other the 1/36° eNEATL36 area (left) and other the 1/108° AGRIF zoom (right) after 1.5 month of simulation. The area contoured in dark is the high resolution nest area.

Intallation

• Download XIOS:

svn co -r 2130 http://forge.ipsl.jussieu.fr/ioserver/svn/XIOS/trunk XIOS

• Download NEMO trunk

git clone --branch 4.2.0 https://forge.nemo-ocean.eu/nemo/nemo.git nemo_4.2.0

How to compile

1 : create the configuration : ./makenemo -m your_archfile -r eNEATL36_AGRIF -n AMM12 -j 20
2 : Change cpp keys to : key_xios key_agrif key_qco and add "NST" to your configuration in work_cfg.txt file
3 : clean and recompile : ./makenemo -m your_archfile -r eNEATL36_AGRIF -j 20 clean ./makenemo -m your_archfile -r eNEATL36_AGRIF -j 20

• An compilation script is also available here . The list of modules necessary to compile on météo-france belenos supercomputer can be found in this script.

• Note that you also have compile the domain_cfg creation tool in order to perform a simulation. To do so, use ./maketools -n DOMAINcfg -m your_archfile in the tools directory, with the cpp keys : key_mpp_mpi key_agrif.

Create the input mesh files :

• Sec. 1 and 2 of the wiki describe the procedure to recreate the eNEATL36 + BIZoo input mesh files.

Run a eNEATL36-AGRIF simulation :

• Sec. 4 of the wiki describes how to run a simulation.