Arpège model input

Dataset specific topics involving WPS.

Arpège model input

Postby beni » Mon Aug 17, 2015 11:09 am

Hello,

Météo France recently opened up gridded numerical forecast model data for its global model, Arpège.
The files are in GRIB2 format, updated 4 times a day, with 6 hours frequency, and in 0.1 degree resolution for Europe (0.5 degree for the rest of the world).
It can be downloaded from here: https://donneespubliques.meteofrance.fr/?fond=produit&id_produit=130&id_rubrique=51

I wondered if there is a way to use it as an input source and boundary condition for a WRF run - Vtable, download sript, etc. Does anyone have experience with this?
beni
 
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Re: Arpège model input

Postby imdnme » Sun Jul 17, 2016 4:20 am

Download script - you can make one yourself, by right-clicking the active (or finished) downloads in your browser and copying the download link. No more than 4 simultaneous downloads are allowed.
Something like:
Code: Select all
http://dcpc-nwp.meteo.fr/services/PS_GetCache_DCPCPreviNum?token=__5yLVTdr-sGeHoPitnFc7TZ6MhBcJxuSsoZp6y0leVHU__&model=ARPEGE&grid=0.1&package=IP1&time=49H60H&referencetime=2016-07-15T06:00:00Z&format=grib2


Using this data in WRF, however, is tricky.
You can make your own Vtables, based on the GRIB codes and variable names from Vtable.ECMWF ( which is for GRIB1), but you need to add 4 columns to the right (GRIB2, for example look at Vtable.GFS).

You also need to split the ARPEGE GRIB2 files, which contain multiple forecast times (arranged by variable), into time-specific files, so ungrib can read them. This can be done by installing and using wgrib2.

ARPEGE file IP1 has the variables GEOPT, T, U, V, RH; file SP1 - Sea level pressure, U10m , V10m, T2m, RH2m; file SP2 - Surface pressure, SKINTEMP, but soil variables seem to be missing completely.

So far I succeeded in making 3 Vtables and running ungrib, but metgrid complains about the missing soil data and stops.
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