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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: (Better use more specific question? Here or elsewhere?) day
2.1 Atmosphere and land surface
Model | ARPEGE v6.1 (atmosphere) SURFEX 7.3 (land surface) |
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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
More model details? (e.g. land surface model?)Land surface model: SURFEX 7.3
2.
...
2 Ocean and cryosphere
Ocean model | NEMO v3.42 |
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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
Re-forecastHindcast | 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:
More DA details?
Data assimilation method for control analysis:
Horizontal and vertical resolution of perturbations: T42L91 SVs+ T399L137 EDA perturbations
Perturbations in +/- pairs: Yes
see ECMWF page
3.2 Ocean and cryosphere
Re-forecastHindcast | Forecast | |
---|---|---|
Ocean initialization | GLORYS2V2 | Mercator-Ocean |
Ocean IC perturbations | None | None |
Unperturbed control forecast? | NA | NA |
Detailed documentation:
More ocean data assimilation details?
Source and treatment of SST? (Other data sources - altimetry?)Mercator-Ocean initialization
4. Model uncertainties perturbations:
Model dynamics perturbations | Yes |
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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 |
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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.