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title28-11-2006 ECMWF

ECMWF upgraded its Ensemble Prediction System (EPS) and introduced the Variable Resolution Ensemble Prediction System (VarEPS). In particular, the forecast range was extended to 15 days using the VarEPS system with a resolution of T399 L62 for day 1 to day 10 (leg 1) and T255 L62 for T+246 to day 15 (leg 2).

JMA

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title19-01-2017 JMA

The JMA updated their Global EPS (previously named One-week EPS) at 00UTC of 19th  January 2017.

Major changes are:

  • The vertical resolution of the Global EPS model is increased from
  • TL479L60 to TL479L100
  • Perturbations from LETKF are introduced for initial perturbations.
  • Perturbations to sea surface temperature are introduced.
  • The name of the EPS is renamed from One-week EPS to Global EPS
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title21-11-2007 JMA

The resolution of one-week ensemble prediction model of JMA was upgraded on 21 November 2007.

Major changes are:

  • Increase in the resolution from TL159L40 to TL319L60 with a topmost level raised from 0.4hPa to 0.1hPa.
  • Use of a new high-resolution analysis of sea surface temperature and sea ice concentration as ocean surface boundary conditions.
  • Use of surface snow depth data from the domestic dense observational network in the global snow depth analysis.
  • Introduction of a convective triggering scheme into the deep convection parameterization.
  • Introduction of a new 2-dimensional aerosol climatology derived from satellite observations for the radiation calculation.
  • Increase in the resolution of inner loop model of the four-dimensional variational (4D-Var) data assimilation system from T106L40 to T159L60.
  • Introduction of a sigular vector method to make the initial perturbations.

Notes:

  • The resolution and parameters of TIGGE data from JMA remains unchanged.
  • Orography and Land Sea Mask in TIGGE data are slightly different from the previous data associated with the model change.

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