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System Configuration Information

These information can be changed if the corresponding operational model is modified.

GPC ECMWF

GPC ECMWF
When was the current long-range forecast system implemented? November 2017
Is it a coupled forecast system? Yes
Is it a Tier-2 forecast system? No
Atmospheric model resolution Spectral, Tco319/L91 (horizontal resol. about 35Km)
Ocean model (if applicable) NEMO version3.4
Source of atmospheric initial conditions ERA-interim for the period 1981 to 2016 and ECMWF operational analysis from 2017 onwards
Source of ocean initial conditions Global Ocean Data Assimilation System (NEMOVAR -OCEAN5)
If Tier-2, what is the source of SST predictions? N/A
Hindcast period 1981-2016 however the calibration period is: 1993-2016
Ensemble size for the hindcasts 25
How is the hindcast ensemble configured?  5-member ensemble ocean analysis combined with SST perturbations and the activation of stochastic physics
Ensemble size for the forecast 51
How is the forecast ensemble configured?  5-member ensemble ocean analysis combined with SST perturbations and the activation of stochastic physics
Length of forecasts 7 months (four times a year 11 members are extended to 13 months)
Data format GRIB 1
What is the latest date predicted anomalies for the next month/season become available? 10 th of the current month
How are the forecast anomalies constructed? Departures from the model climate estimated by the hindcast integrations (1993-2016)
URL where forecast are displayed https://www.ecmwf.int/en/forecasts/documentation-and-support/long-range
Point ofContact Laura Ferranti (l.ferranti@ecmwf.int)
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