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System Configuration Information

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

GPC Toulouse

GPC Toulouse
When was the current long-range forecast system implemented? July 2021
Is it a coupled forecast system? Yes
Is it a Tier-2 forecast system? No
Atmospheric model resolution T359L137
Ocean model (if applicable) NEMO v3.6 , ORCA 1/4° grid, 75 model levels. Frequency of coupling is 3 hours
Source of atmospheric initial conditions ECMWF operational analysis
Source of ocean initial conditions Mercator-ocean analysis
If Tier-2, what is the source of SST predictions? N/A
Hindcast period 1993-2018
Ensemble size for the hindcasts 25 members
How is the hindcast ensemble configured?

3 lagged initialization (12 runs, 12 runs, 1 run), each built with 1 atmospheric condition from ERA5 and 1 oceanic condition from Mercator analysis.

For the 2 first initialization dates, ensemble generation by stochastic dynamics technique (Batté and Déqué 2016).

The last initialization date begins the 1st of initialization month.
Ensemble size for the forecast 51 members
How is the forecast ensemble configured?

Same method as for the hindcast.

3 lagged initialization (25 runs, 25 runs, 1 run).

Length of forecasts 7 months
Data format GRIB 2 or ascii for digital data
Gif for graphics
What is the latest date predicted anomalies for the next month/season become available? 13th of each month
How are the forecast anomalies constructed? Departures from the model climate estimated by the hindcast integrations
URL where forecast(maps) are displayed
Point of Contact

JM Soubeyroux (

Christine Quicot (

Christian Viel (

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