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| Ocean model | NEMO v3.4 | |
|---|---|---|
| Horizontal resolution | ORCA 0.25 | |
| Vertical resolution | L75 | |
| Time step | ||
| Sea ice model | ||
| Sea ice model resolution | ||
| Sea ice model levels | ||
| Wave model | ||
| Wave model resolution | 0.5 degrees |
Detailed documentation: NEMO documentation
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| Re-forecast | Forecast | |
|---|---|---|
| Atmosphere initialization | ERA-Interim | |
| Atmosphere IC perturbations | ||
Land Initialization | ||
| Land IC perturbations | ||
| Soil moisture initialization | ||
| Snow initialization | ||
| Unperturbed control forecast? |
Detailed documentation: IFS cycle 43r1 documentation and SEAS5 user guide
More DA details?
Data assimilation method for control analysis: 4D Var (atmosphere) and 3DVAR (ocean/sea-ice)
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| Re-forecast | Forecast | ||||
|---|---|---|---|---|---|
| Ocean initialization | ORAS5ORTA5 | ||||
| Ocean IC perturbations | Yes - generated through perturbations to assimilated observations and surface forcing | Yes - generated throughperturbations | to assimilated observations and surface forcing|||
| Unperturbed control forecast? | No | No
Detailed documentation: ECMWF ocean reanalysis documentation and SEAS5 user guide
More ocean Ocean data assimilation details?
Source and treatment of SST? (Other data sources - altimetry?)
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| Model dynamics perturbations | No||
|---|---|---|
| Model physics perturbations | 3-lev SPPT and SPBS||
If there is a control forecast, is it perturbed? | Yes
Detailed documentation: IFS cycle 43r1 documentation
5. Forecast system and re-forecasts
Note, the ECMWF seasonal forecasts cover two time ranges: the long range (LR) forecasts out to 7 months, and annual range (AR) forecasts out to 13 months. The model used for these forecasts is identical, but they have different numbers of forecast members.
| Forecast frequency | monthly (LR) quarterly (AR) | |
|---|---|---|
| Forecast ensemble size | ||
| Re-forecast years | 36 (1981-2016) | |
| Re-forecast ensemble size | 25 (LR) 15 (AR) | |
| On-the-fly or static re-forecast set? | static | |
| Calibration (bias correction) period | 1993-2016 |
6. Where to find more information
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