Page History

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The page will be updated as required. It was last changed on 281.1011.2016.

• Latest change: A new land surface simulation is used for the land initial conditions of the ENS re-forecasts - see Meteorological content of the new cycle.
  
• Previous change: release candidate test data in dissemination, in MARS and in ecCharts available on 25 October 2016.

The next expected update to this page will be on 15.11.2016.

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• The horizontal and vertical resolutions of the ocean model (NEMO v3.4.1) used by ENS is increased from 1 degree and 42 layers to 0.25 degree and 75 layers (ORCA025Z75).  An interactive sea-ice model (the Louvain-la-Neuve Sea Ice Model - LIM2) is introduced so that sea-ice cover evolves dynamically. Previously it was persisted for 15 days; over the next 30 days of the forecast, it was relaxed towards the climatology of the previous 5 years.

• Ocean initial conditions are taken from ORAS5 instead of ORAS4.

• A global fix for tendency perturbations in the stochastic model error scheme SPPT to improve global momentum, energy and moisture conservation properties.

• The land initial conditions of the ENS re-forecasts are taken from a new land surface simulation at the native ENS resolution (T_CO639, ~16km),  replacing the previous configuration that used ERA-Interim/Land (at T_L255 resolution,  ~80 km)

Technical changes

• ecCodes replaces grib_api for encoding and decoding model output in GRIB.

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