Data set description
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The set of ARPEGE analyzed fields available in the FASTEX Central Archive corresponds to the data assimilation suite run operationally at Meteo-France during the campaign, with a scheme based on the Optimal Interpolation formalism.
Spatial coverage and resolution:
Global grid, latitude X longitude, resolution 1.5 degrees,
Vertically : 24 pressure levels.
This resolution appears as a reasonable compromise between what the model can represent and what the data distribution is representative of.
Temporal coverage and resolution: January and February 97 will be entirely covered (60 days), frequency 6 hours.
4D-Var data set:
Since the field phase of the experiment, a new data set of analyses
has been built from a complete reanalysis of the FASTEX period with
a 4D-Var scheme. This scheme has become the operational assimilation
system at Meteo-France, since July 2000.
Apart from the difference in the assimilation formalism, these new
analyses also differ from the operational ones by the fact that they
use the TOVS radiances directly (without preliminary inversion) and
that the resolution has been increased: 31 levels and a T199 spectral
resolution on the stretched sphere.
The 4D-Var analyses are available in a GRIB or ARPEGE format upon request. This allows to better fulfill users' specifications on the resolution or the type of the retrieved fields.
Data set in the FASTEX Central Archive: