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2.1 Atmosphere and land surface
| Model | IFS Cycle 43r1 |
|---|---|
| Horizontal resolution and grid | Dynamics:TCO319 Cubic octahedral grid Physics: O320 Gaussian grid (35 km) |
| Atmosphere vertical resolution | L91 (0.01 hPa) |
| Top of atmosphere | 0.01 hPa (approx. 80 km) |
| Soil levels | |
| Time step | 20 minutes |
Detailed documentation: IFS cycle 43r1 documentation
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| Re-forecast | Forecast | |
|---|---|---|
| Atmosphere initialization | ERA-Interim | ECMWF Operations |
| Atmosphere IC perturbations | Ensemble data assimilation and leading singular vectors applied to upper air variables | Ensemble data assimilation and leading singular vectors applied to upper air variables |
Land Initialization | ERA-Interim land (43r1) | ECMWF Operations |
| Land IC perturbations | Ensemble data assimilation and leading singular vectors applied to some land fields | Ensemble data assimilation and leading singular vectors applied to some land fields |
| Soil moisture initialization | ERA-Interim | ECMWF operations |
| Snow initialization | ERA-Interim | ECMWF operations |
| Unperturbed control forecast? | Yes | Yes |
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| Re-forecast | Forecast | |
|---|---|---|
| Ocean initialization | ORAS5 | ORTA5 |
| Ocean IC perturbations | Yes - generated through perturbations to assimilated observations and surface forcing | Yes - generated through perturbations to assimilated observations and surface forcing |
| Unperturbed control forecast? | No | No |
4. Model Uncertainties perturbations:
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