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Identifier code: Météo-France System 7 8
First operational forecast run: October 2019 July 2021
2. Configuration of the forecast model
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| Model | ARPEGE v6.4 SURFEX v8.1 |
|---|---|
| Horizontal resolution and grid | TL359; 0.5° reduced Gauss grid |
| Atmosphere vertical resolution | 91 137 layers |
| Top of atmosphere | top layer 1 Pa |
| Soil levels | 14 layers |
| Time step | 10 min |
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| Hindcast | Forecast | |
|---|---|---|
| Atmosphere initialization | ERA5 | IFSERA5T |
| Atmosphere IC perturbations | None | None |
Land Initialization | ERA5 | IFSERA5T |
| Land IC perturbations | None | None |
| Soil moisture initialization | ERA5 | IFSERA5T |
| Snow initialization | ERA5 | IFSERA5T |
| Unperturbed control forecast? | NA | NA |
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| Forecast frequency | month |
|---|---|
| Forecast ensemble size | 51 |
| Hindcast years | 1993-20162018 |
| Hindcast ensemble size | 25 |
| 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 members in the hindcasts)
- The last Thursday of the previous month (25 members in the forecasts, 12 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 (ERA5 in the hindcast) in the atmosphere and Mercator Ocean International analyses in the ocean. Sea ice initial conditions are provided by a separate NEMO-GELATO ORCA 0.25 forced run nudged towards the same ocean analyses.
7. Where to find more information
Technical implementation details can be found in http://www.umr-cnrm.fr/IMG/pdf/system7system8-technical.pdf