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Atmospheric general circulation component
Table 1a: Key characteristics of the atmospheric component of the IFS based on
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| Forecast / Analysis | Number of members | Horizontal resolution | Vertical levels | Pressure at model top (hPa) | Perturbation models | |
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HRES Atmospheric Model high resolution | Forecast
| 1 |
| 0.01 hPa | No | ||
ENS Ensemble - Atmospheric Model | Forecast
| 51 | Day 0-15
| 137 | 0.01 hPa | Yes (4) | |
ENS Extended Atmospheric Model Extended forecast (monthly) | Forecast
| 51 |
| 0.01 hPa | Yes (4) | ||
4DVAR 4-Dimensional data assimilation
| Analysis | 1 |
| 0.01 hPa | No | ||
EDA Ensemble of data assimilations | Analysis | 51 |
| 0.01 hPa | Yes (5) | ||
SEAS5 2017 version Cycle 43r1 Seasonal forecast | Forecast
| 51 15 |
| 0.01 hPa | Yes (4) |
Ensemble and
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seasonal re-forecasts
Table 1b: Key characteristics of the ENS and SEAS re-forecasts of the ECMWF IFS
| Forecast/Analysis | Number of members | Horizontal resolution | Vertical levels | Pressure at model top (hPa) | Perturbation models | Number of years | |
---|---|---|---|---|---|---|---|---|
ENS |
| 11 | Day 0-15
Day 16-46
| 137 | 0.01 hPa | Yes (4) | Most recent 20 | |
SEAS5 Cycle 43r1 Seasonal forecast | Forecast
| 25 15 |
| 0.01 hPa | Yes (4) | 36 (1981-2016) |
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Ocean general and sea ice
Table 1c: Key characteristics of the ocean component general circulation models of the ECMWF IFS
| Forecast/Analysis | Number of members | Horizontal resolution ORCA grid | Vertical levels |
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NEMO (LIM-2) | Forecast
| 51 | 0.25° | 75 |
Oceans
| Analysis Reanalysis | 5 | 0.25° | 75 |
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Ocean-wave component
Table 1d: Key characteristics of the ocean-wave component of the ECMWF IFS
Forecast/Analysis | Domain | Number of members | Horizontal resolution | |
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Ocean Wave coupled to the atmospheric model | Analysis and forecast
| Global | 1 |
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Ensemble wave forecast | Forecast
| Global | 51 | 0-15 days
16-46 days
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Seasonal wave forecast | Forecast
| Global | 51 |
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Atmospheric and Ocean-wave reanalysis ERA5
ERA5, based on IFS Cycle 41r2, is used to initialise ensemble reforecasts.
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