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Identifier code: Météo-France System 9
First operational forecast run: April May 2025
2. Configuration of the forecast model
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The atmosphere and land surface are initialized with ERA5T ERA5 data (ERA5 in the hindcastERA5T in real-time), such that they use the ERA5 data assimilation performed by ECMWF.
Ocean and sea-ice initial conditions are provided by a stand-alone NEMO 4.2 - SI3 run that is forced by ERA5(T) at the surface and nudged towards the GLORYS12V1 reanalysis (GLO12 analysis (GLORYS12V1 reanalysis in the hindcastin real-time) in temperature and salinity.
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Météo-France System 9 is built on the CNRM-CM coupled climate model which embeds an output manager called the XIOS server (Meurdesoif et al, 2018). XIOS is an input/output parallel server software enabling to perform online field operations in the course of the model integration and writing the final result on NetCDF files. For atmosphere and land surface data, all operations such as time sampling, time averaging, horizontal regridding or vertical interpolation are specified through xml files and performed by XIOS such that no or little post-processing is needed: the only output files written on disk are the files featuring the requested C3S 1°x1° horizontal grid and pressure levels. For ocean and sea-ice data, the output files are written by XIOS on the native NEMO grid and remapped on the C3S 1°x1° horizontal grid throug post-processing, using the cdo "remapbilremapdis" function.
Horizontal Interpolation
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