Home > User’s guide > 11. Data assimilation > 11.1 Interface and usage

11.1 Interface and usage

Latest update : 24 July 2014.

All related assimilation code is found in the source directory ASSIM.

The interface to the data assimilation is through the routine assim_surf_atmn. Input needed to this routine and the downstream call-tree is either given as arguments or via a normal initalization through the routine init_surf_atmn.

The assimilation is tile-independent. That means the individual tiles are treated separately and different assimilation alghoritms can be used for the different tiles. This documentation will explain the different options for the different tiles.

Inside the assimilation interface and below, no IO should be performed unless the IO is processor dependent and in that case the number of processors must be kept constant.

After the assimilation is performed the updated fields are written out through the normal SURFEX output routines (write_surf_atmn).

The assimilation is enabled in by setting LASSIM=.TRUE. together with the selected schemes and the started in either inline or offline mode.

Relevant settings in namelist NAM_ASSIM:

NPRINTLEV
Fortran name Fortran type values default value
LASSIM logical .FALSE.
NPRINTLEV INTEGER 0
  • LASSIM : Enables assimilation
  • NPRINTLEV : Verbosity level

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