init_obsvars_pdaf

The page documents the user-supplied call-back routine init_obsvars_pdaf, which was introduced with PDAF V3.0.

The routine init_obsvars_pdaf (named U_init_obsvars inside PDAF) is a call-back routine that has to be provided by the user. The routine is used only with the ENSRF/EAKF. The routine is called by PDAF during the analysis step and has to provide the filter with a vector of observation error variances.

The interface is the following:

  SUBROUTINE init_obsvars_pdaf(step, dim_obs_f, var_f)

with arguments:

  INTEGER, INTENT(in) :: step           ! Current time step
  INTEGER, INTENT(in) :: dim_obs_f      ! Dimension of full observation vector
  REAL, INTENT(out) :: var_f(dim_obs_f) ! vector of observation error variances

The variance vector var_f is for the full observation vector.