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Model climates are an important product produced within the IFS.  These are: M-climate for medium range ENS, ERSUBS-M-climateClimate for sub-seasonal range ENS, S-M-climate for seasonal forecasting.  They are a wholly model-based assessment of worldwide climatology based on analyses and re-forecasts over a previous period of 20 or 30 years.  

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• Sub-seasonal range ensemble (formerly extended range) forecast system:
  • The name of the extended range ensemble and associated forecast period is changed to sub-seasonal range ensemble and forecast period.  The forecast system itself is unchanged.
  • Unchanged are: 
    • the horizontal resolution remains at 36 km.
    • the vertical resolution remains at 137 model levels.
    • the number of ensemble members is 100 members plus a control member.
    • the sun-seasonal range ensemble is run daily from Day0 to Day46 based on 00UTC data.
    • the model climate associated with the sub-seasonal ensemble is now known as the SUBS-M-Climate (formerly known as ER-M-Climate and identical to it).

• Wave model system:
  • the horizontal resolution is reduced to 9km for the medium range and to 36km for the sub-seasonal range. The resolutions are the same as the corresponding atmospheric model.
  • the number of medium range 2D wave spectra is reduced from 36 to 29. The first 29 frequencies in previous cycles are retained but the remaining 7 frequencies are not.
  • the wave model ensembles are run daily Day0 to Day15 based on 00UTC and 12UTC data and Day-0 to Day6 based on 06UTC and 18UTC data.
  • Unchanged are: 
    • the number of directions remains at 36. 

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