Atmospheric general circulation component
Table 1a: Key characteristics of the atmospheric component of the IFS based on cycle 47r3
| Forecast / Analysis | Number of members | Horizontal resolution | Vertical levels | Pressure at model top (hPa) | Perturbation models | |
---|---|---|---|---|---|---|---|
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) | |
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 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) |
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 |
---|---|---|---|---|
NEMO (LIM-2) | Forecast
| 51 | 0.25° | 75 |
Oceans
| Analysis Reanalysis | 5 | 0.25° | 75 |
Ocean-wave component
Table 1d: Key characteristics of the ocean-wave component of the ECMWF IFS
Forecast/Analysis | Domain | Number of members | Horizontal resolution | |
---|---|---|---|---|
Ocean Wave coupled to the atmospheric model | Analysis and forecast
| Global | 1 |
|
Ensemble wave forecast | Forecast
| Global | 51 | 0-15 days
16-46 days
|
SEAS-WAM Seasonal wave forecast | Forecast
| Global | 51 |
|
Atmospheric and Ocean-wave reanalysis ERA5
ERA5, based on IFS Cycle 41r2, is used to initialise ensemble reforecasts.
Forecast/Analysis | Number of members | Horizontal resolution | Vertical levels | Pressure at model top (hPa) | Perturbation models | ||
---|---|---|---|---|---|---|---|
ERA5 HRES Atmospheric high resolution reanalysis |
| 1 |
| 137 | 0.01 | No | |
ERA5 EDA Atmospheric reduced resolution ensemble |
| 10 |
| 137 | 0.01 | Yes (5) | |
ERA5 wave Ocean wave model (WAM) reanalysis |
| 1 | 0.36 degrees | 1 | - | No | |
ERA5 wave EDA Ocean wave reduced resolution ensemble |
| 10 | 1.0 degrees | 1 | - | Yes (5) |
4D-Var data available for all the 4 entries.
(1) Native: as produced by the model on reduced Gaussian grids or spherical harmonics.
(2) Interpolated to lat/lon
(3) Native: as produced by the model on reduced lat/lon grids.
(4) in analysis and model physics
(5) in observations and model physics