1. Forecast system version

Identifier code: Météo-France System 7

First operational forecast run: October 2019

2. Configuration of the forecast model

Is the model coupled to an ocean model?   Yes

Coupling frequency: 1 hour

2.1 Atmosphere and land surface

Detailed documentation:

ARPEGE: http://www.umr-cnrm.fr/IMG/pdf/arp62ca.july2017.pdf

SURFEX: http://www.umr-cnrm.fr/surfex//IMG/pdf/surfex_scidoc_v8.1.pdf

2.2 Ocean and cryosphere

Detailed documentation:

NEMO: NEMO documentation

GELATO: GELATO documentation

3. Initialization and initial condition (IC) perturbations

3.1 Atmosphere and land

Detailed documentation: see ECMWF page

3.2 Ocean and cryosphere

Detailed documentation: https://www.mercator-ocean.fr/solutions-expertises/produits-references-mercator-ocean/

4. Model Uncertainties perturbations:

Detailed documentation: Batté, L. and Déqué, M., 2016: Randomly correcting model errors in the ARPEGE-Climate v6. 1 component of CNRM-CM: applications for seasonal forecasts, Geoscientific Model Development,9, 2055-2076, doi:10.5194/gmd-9-2055-2016

5. Forecast system and hindcasts

6. Other relevant information

The forecast uses three start dates:

• The penultimate Thursday of the previous month (25 members in the forecasts, 12 members in the hindcasts)
• The last Thursday of the previous month (25 members in the forecasts, 12 members in the hindcasts)
• the 1st of the month (1 member in the forecast/hindcast)

7. Where to find more information

Technical implementation details can be found in http://www.umr-cnrm.fr/IMG/pdf/system7-technical.pdf