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The ECMWF Integrated Forecasting System (IFS) consists of several components coupled together in various different ways:
- an atmospheric model run at various resolutions appropriate to the forecast length: HRES for (Day0-Day10), ensemble (ENS) (for Day0-Day15), extended-range (for Day0-Day46), and seasonal forecast (for month0-month7 or month0-month13).
- an ocean wave model (ECWAM).
- an ocean model (NEMO) including a sea ice model, the Louvain-la-Neuve Sea Ice Model (LIM2).
- a land surface model (HTESSEL) including a lake model (FLake).
- a data analysis system (4D-VAR).
- perturbation techniques for generation of the ensembles.
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