4 times per day 08:00, 14:00, 20:00, and 00:00 UTC (Currently 08:00 and 20:00 updates are available on TWO)
Resolution 0.1° x 0.1° (Europe)
The initial conditions of the ARPEGE model are based on a 4 dimensional variational assimilation (4D-Var) that incorporates a very large
and varied amount of conventional observations (radio sounding, airplane measurements, ground stations, ships, buoys, etc) and also from
remote sensing (ATOVS, SSMI/S, AIRS, IASI, CRIS, ATMS, SEVIRI, GPS sol, GPS satellite, SATOB, diffusiomètres, etc...).
ARPEGE uses a set of primitive equations with a triangular spectral truncation on the horizontal, with a variable horizontal resolution, with a
finite elements representation on the vertical and a “sigma-pressure” hybrid vertical coordinate.
It also utilizes a temporal two time level semi-implicit semi-lagrangian scheme. The horizontal resolution of the ARPEGE model is around 7.5km over
France and 37km over the Antipodes. It has 105 vertical levels, with the first level at 10m above the surface and an upper level at around 70km. Its time step is of 360 seconds.
Model information from the National Centre for Meteorological Research
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