ARPEGE NH

Model description

ARPEGE-NH is the non-hydrostatic version of the Météo-France operational configuration that inherits features from both the ARPEGE/IFS global model and the AROME non-hydrostatic Local Area model.

Contact

Ludovic Auger, Météo-France, FR

Data structure

Vertical

On the vertical, ARPEGE-NH uses a terrain following a hybrid pressure-based formulation with 75 levels. The first level is at 17m above ground at sea level. The microphysical scheme uses 5 water species (rain, snow, cloud ice, cloud water, graupel).

Horizontal

The ARPEGE-NH configuration uses a Gaussian reduced grid with the truncation T8000 in spectral space, that means that the corresponding horizontal grid has a 2.5km resolution. The maximum slope of the orography is 49° and the maximum altitude is 8200m.

Data access

Initialisation and Boundary conditions

Soil Initialisation

Soil analysis from the IFS has been used as a daily update of the soil variables.

Input Data

The provided atmospheric initial condition has been used (data from IFS valid for 01 Aug 2016).

Treatment of SST and Sea Ice

See also https://git.iac.ethz.ch/heimc/dyamond_mistral/-/blob/master/doc_ARPEGE.txt