1. Forecast system version
System name: Météo-France system 5
First operational forecast run: July 2016
2. Configuration of the forecast model
Is it a coupled model ? yes
Coupling frequency: day
2.1 Atmosphere and land surface
| Model | ARPEGE v6.1 (atmosphere) SURFEX 7.3 (land surface) |
|---|---|
| Horizontal resolution and grid | TL255: 0.7° Gauss reduced grid |
| Atmosphere vertical resolution | 91 layers |
| Top of atmosphere | top layer: 0.2 Pa |
| Soil levels | 3 layers (top, root, total) geographically dependent |
| Time step | 15 min |
Detailed documentation: ARPEGE documentation
Land surface model: SURFEX 7.3
2.2 Ocean and cryosphere
| Ocean model | NEMO v3.2 |
|---|---|
| Horizontal resolution | 1° ORCA grid |
| Vertical resolution | 42 levels |
| Time step | 1 hour |
| Sea ice model | GELATO v5 |
| Sea ice model resolution | 1° ORCA grid |
| Sea ice model levels | 9 (+1 for snow) |
| Wave model | None |
| Wave model resolution | NA |
Detailed documentation: NEMO documentation
3. Initialization and initial condition (IC) perturbations
3.1 Atmosphere and land
| Hindcast | Forecast | |
|---|---|---|
| Atmosphere initialization | ERA-interim | IFS |
| Atmosphere IC perturbations | None | None |
Land Initialization | ERA-interim | IFS |
| Land IC perturbations | None | None |
| Soil moisture initialization | ERA-interim | IFS |
| Snow initialization | ERA-interim | IFS |
| Unperturbed control forecast? | NA | NA |
Detailed documentation: see ECMWF page
3.2 Ocean and cryosphere
| Hindcast | Forecast | |
|---|---|---|
| Ocean initialization | GLORYS2V2 | Mercator-Ocean |
| Ocean IC perturbations | None | None |
| Unperturbed control forecast? | NA | NA |
Detailed documentation: Mercator-Ocean initialization
4. Model uncertainties perturbations:
| Model dynamics perturbations | Yes |
|---|---|
| Model physics perturbations | No |
If there is a control forecast, is it perturbed? | NA |
Details in: 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, in line, doi:10.5194/gmd-9-2055-2016
5. Forecast system and hindcasts
| Forecast frequency | month |
|---|---|
| Forecast ensemble size | 51 |
| Hindcast years | 1991-2014 |
| Hindcast ensemble size | 15 |
| On-the-fly or static hindcast set? | static |
6. Other relevant information
Before getting an operational status in July 2016, the forecasts had been produced since January 2015.
The hindcast/forecast ocean initial conditions are calculated with Mercator-Ocean PSI2G3R3 software. Before 1993, the ocean initial conditions come from ECMWF NEMOVAR reanalysis.
The forecast uses two start dates:
- The first Wednesday falling between the 12th and the 18th of the previous month (25 members)
- The following Wednesday (26 members)
The hindcast uses only the latter date (15 members).
7. Where to find more information
Technical implementation details can be found here.
