The Joint Marine Modelling Programme (JMMP) provides world-class and easily accessible national capability, ocean modelling infrastructure and configurations to support the UK’s scientific research and operational prediction systems for ocean, weather and climate. It is partnership between the Met Office and British Antarctic Survey, National Oceanography Centre and Centre for Polar Observation and Modelling.
Model configurations are underpinned by the Nucleus for European Modelling of the Ocean (NEMO) framework. JMMP works closely with the NEMO consortium to develop the underpinning model capability.
The key update in this version of the AMM7 configuration is the change to a multi-envelope vertical coordinate system (from a quasi-sigma terrain following system). Details of this vertical coordinate system change can be found in the Ocean Modelling article The effect of vertical coordinates on the accuracy of a shelf sea model and accompanying repository.
| **Configuration ** | Specification |
|---|---|
| Nemo-ocean repository | http://forge.ipsl.jussieu.fr/nemo/svn/NEMO |
| Branch | releases/r4.0/r4.0.2 |
| Components | OCE |
| CPP keys | key_mpp_mpi key_vectopt_loop key_nosignedzero key_iomput |
| Grid | ORCA |
| Resolution | 7 km |
| Horizontal Gridpoints | 111,375 (y=375, x=297) |
| Vertical Levels | 51 |
| Vertical Coordinates | Multi-Envelope - 2 envelopes of quasi-sigma terrain following |
| Time Step [s] | 300 / 30 |
| Boundaries | 2 sets of unstructured 2d and 3d open boundaries (1 for open ocean, 1 for Baltic) |
To clone the git repository locally
git clone [email protected]:JMMP-Group/CO9_AMM7.git
To then download NEMO and copy files from the git repo into the appropriate directories
./CO9_AMM7/scripts/setup/amm7_setup_light -w $PWD/CO9_AMM7_instance -s $PWD/CO9_AMM7
For ARCHER2 follow the instructions here to compile XIOS and then setup the compiler configuration file for NEMO. NEMO can then be compiled with
cd CO9_AMM7_instance/nemo
./makenemo -m X86_ARCHER2-Cray -r AMM7 -j 16
Create a link to xios in the experiment (i.e. EXP00) directory, e.g.
ln -s ${PRFX}/xios/2.5/cmpich8-ucx/cce12/bin/xios_server.exe xios_server.exe
Input files can then be downloaded into the experiment directory and the configuration should then be setup. A sample runscript is included to run on ARCHER2 in the EXP00 directory.
| Input | Download Location |
|---|---|
| Domain_cfg.nc | https://gws-access.jasmin.ac.uk/public/jmmp/AMM7/CO9_repo/domain_cfg_co9amm7_MEsL51r10-07.nc |
| Open ocean boundary coordinates.bdy.nc | http://gws-access.jasmin.ac.uk/public/jmmp/AMM7/grid/coordinates.bdy.nc |
| Baltic coordimates.bdy.nc | http://gws-access.jasmin.ac.uk/public/jmmp/AMM7/grid/coordinates.skagbdy.nc |
| Forcing | Download Location |
|---|---|
| Surface boundary | http://gws-access.jasmin.ac.uk/public/jmmp/AMM7/inputs/SBC/ |
| Open ocean boundary | http://gws-access.jasmin.ac.uk/public/jmmp/AMM7/inputs/BDY/ |
| Baltic boundary | http://gws-access.jasmin.ac.uk/public/jmmp/AMM7/inputs/BDY_SKAG/ |
| River runoff | http://gws-access.jasmin.ac.uk/public/jmmp/AMM7/inputs/RIV/ |
| Tide | https://gws-access.jasmin.ac.uk/public/jmmp/AMM7/inputs/TIDE/ |
| Initial condition | https://gws-access.jasmin.ac.uk/public/jmmp/AMM7/inputs/IC/ |
For the atmospheric boundary data a land sea mask can be applied to mask the data over land on the native atmospheric grid. This masked data can be filled by the user during preproccessing (effectively not applying a land sea mask) or the lasn sea mask can be supplied and NEMO can fill the relevent grid points at runtime. The namelist option nn_lsm specifies how the atmospheric data on the model grid is extrapolated from the unmasked data around the coastlines when a land sea mask is supplied. Although nn_lsm=1 should in prinicple be ok, it has been found that inconsistencies between model runs using different core setups can then accumulate. It is therefore recommended to fill the land points during preprocessing or set nn_lsm=10, which simply mean more model grid points are filled at runtime.