The ECMWF Integrated Forecasting System (IFS)
See also:
Indicators for Resolution:
Summary of the key characteristics of the IFS. Operational configurations of the ECMWF Integrated Forecasting System (IFS)
More info at:
Documentation Atmospheric model CY48R1
ERA ERA-Interim, ERA5, ERA5-Land
Model | Function | System Name | Resolution & Levels (follow links to see where the model levels are) | Ensemble Size | Top Level |
Atmospheric General Forecast Model | High Resolution | HRES | ~9km (TCo1279) | 1 | 0.01 hPa |
Ensemble | ENS | ~9km (TCo1279) | 50 + Control | 0.01 hPa | |
Ensemble Extended | ENS Extended | ~36km (TCo319) | 100 + Control | 0.01 hPa | |
Seasonal (run monthly for months 0-7) | S5 or SEAS | ~36km (TCo319) | 50 + Control | 0.01 hPa | |
| Seasonal (run quarterly for months 0-13) | S5 or SEAS | ~36km (TCo319) | 15 | 0.01 hPa | |
Oceanic wave model (High Resolution) | ~28km | 1 | |||
| Oceanic wave model (Ensemble) | ~28km | 50 | |||
Atmospheric model Reanalysis Re-forecast | ERA5 HRES | ~9km (archived at TCo1279) | 1 | 0.01 hPa | |
Atmospheric model Reanalysis Re-forecast | ERA5 ENS | ~9km (archived at TCo1279) | 10 | 0.01 hPa | |
Atmospheric model Reanalysis Re-forecast | ERA5 Extended ENS | ~36km (archived at TCo319) | 10 | 0.01 hPa | |
Atmospheric model Ensemble of Data Assimilations (EDA) Reanalysis | ERA5 EDA | ~18km (archived at TCo639) | 50 | 0.01 hPa | |
Oceanic wave model Reanalysis Re-forecast | ERA5 Wave | 0.36° Latitude | 1 | ||
Oceanic wave model EDA Reanalysis | ERA5 Wave EDA | 1.00° Latitude | 10 | ||
Parameterised systems for 2-way interaction with Atmospheric Model Resolution same as the calling model... ...unless otherwise shown | Land Surface Model (LDAS) | HTESSEL | |||
Sea Surface Model (WAM) (See below) | WAM | ||||
Lake Model | FLAKE | ||||
Convection Model | CONV | ||||
Clouds - Large Scale Water Processes | LSWP | ||||
Radiation | RDTT | ~55km HRES ~55km ENS ~222km SEAS | |||
Turbulence & Gravity Wave Drag | TGWD | ||||
Non-orographic Gravity Wave Drag | NOGW | ||||
Sea Ice Model (see NEMO below) | LIM2 | ||||
Representation of uncertainty in parameterisation schemes | SPPT | ||||
Representation of uncertainty in energy transfer... ...from sub-gridscales to resolved scales | SKEB |
Table 12.A.2 Main Oceanographic Models and Programmes
Model | Function | System Name | Resolution | Ensemble Size |
Wave forecast model | High Res Stand alone (Ceased 7.1.20) | HRES-SAW | ~11km | 1 |
Ocean wave coupled to High Resolution | HRES-WAM | ~14km. 0.125° Latitude | 1 | |
| Ocean wave coupled to Ensemble | ENS-WAM | ~28km. 0.25° Latitude | 50 + Control | |
| Ocean wave coupled to Seasonal | SEAS-WAM | ~55km. 0.25° Latitude | 50 + Control |
| Model | Function | System Name | Resolution | Ensemble Size |
Ocean General Circulation Model | Ocean General Circulation Model | NEMO | ~28km. 0.25° Latitude 75 levels | 50 + control |
Sea Ice Model | LIM2 | ~28km. 0.25° Latitude |
Table 12.A.3 Data Assimilation Programmes
| Assimilation Programmes | System Name | System Name | Resolution & Levels | Ensemble Size | Top Level |
Atmospheric Data Assimilation Series of nested loops at increasing resolutions |
4D-Var | 4D-Var | 137 levels | 1 | 0.01 hPa |
Ensembles of Data Assimilation Series of nested loops at increasing resolutions | EDA | 137 levels | 50 + Control | 0.01 hPa | |
Ocean Real Time Analysis | NEMOVAR | ORTA4 | ~28km 75 levels | 1 | |
Ensembles of Data Assimilation for Ocean Model Ensemble. | ORAS5 | ~28km 75 levels | 5 |
Indicators for Resolution:
- TL Triangular-linear grid (shortest wave resolution is represented by two grid points).
- TCo Triangular-cubic-octahedral grid (shortest wave resolution is represented by four grid points).
- N Native grid, as produced by the model on reduced Gaussian grids or spherical harmonics.
The numbers indicate the spectral truncation.
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