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| Model dynamics perturbations | Yes |
|---|---|
| Model physics perturbations | No |
If there is a control forecast, is it perturbed? | NA |
Detailed documentation:
Batté, L. and Déqué, M. , (2016:). Randomly correcting model errors in the ARPEGE-Climate v6. 1 component of CNRM-CM: applications for seasonal forecasts, . Geoscientific Model Development, 9, 2055-2076, doi:. https://doi.org/10.5194/gmd-9-2055-2016
6. Forecast system and hindcasts
| Forecast frequency | 1 month |
|---|---|
| Forecast ensemble size | 51 |
| Hindcast years | 1993-20182024 |
| Hindcast ensemble size | 2531 |
| On-the-fly or static hindcast set? | static |
| Calibration (bias correction) period | NA |
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- The penultimate Thursday of the previous month (25 members in the forecasts, 12 15 members in the hindcasts)
- The last Thursday last Thursday of the previous month (25 members in the forecasts, 12 15 members in the hindcasts)
- the 1st of the month (1 member in the forecast/hindcast)
Data assimilation method for analysis
Coupled initialization run nudged towards ERA5T The atmosphere and land surface are initialized with ERA5T data (ERA5 in the hindcast) in the atmosphere and Mercator Ocean International analyses in the ocean. Sea , such that they use the ERA5 data assimilation performed by ECMWF.
Ocean and sea-ice initial conditions are provided by a separate NEMO-GELATO ORCA 0.25 forced run nudged towards the same ocean analysesstand-alone NEMO 4.2 - SI3 run that is forced by ERA5(T) at the surface and nudged towards the GLO12 analysis (GLORYS12V1 reanalysis in the hindcast) in temperature and salinity.
Interpolation details
Météo-France System 8 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. 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.
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Technical implementation details can be found in http://www.umr-cnrm.fr/IMG/pdf/system8-technical.pdfLINK TO BE PROVIDED