This new cycle includes a new method for providing initial-time perturbations for the ENS. In this new cycle, differences between members of an ensemble of data assimilations (EDA) will be used instead of the evolved singular vectors to create initial spread between ENS forecast members. Initial-time singular vectors will continue to be used in conjunction with the EDA perturbations.
With the introduction of IFS cycle 36r2, the GRIB API library replaced GRIBEX for encoding GRIB products from the ECMWF deterministic forecasting system, the Ensemble Prediction System (ENS), including the monthly extension to 32 days, and the Boundary Condition Optional Project.
The main changes included in this cycle are:
Implemented: 22 June 2010 |
Unchanged
Horizontal | Vertical |
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Atmospheric (unchanged)
Wave (unchanged)
| Atmospheric (unchanged)
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The new cycle does not include any meteorologically significant changes to the deterministic forecasting system. This new cycle shows clear benefit in terms of the spread of the ENS, particularly in the first few days of the forecast:
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E-suite experiment number = 0047
ECMWF Newsletter: See Newsletter 123