PDAFomi_obs_op_adj_gridavg

This page documents the routine PDAFomi_obs_op_gridavg of PDAF-OMI.

The routine provides an adjoint observation operator for observations that are the average of some grid point values in the state vector. It is usually called in obs_op_OBSTYPE in an OMI observation module if a 3D-Var method is used.

See the page describing PDAF-OMI observation operators for a general overview.

The interface is:

  SUBROUTINE PDAFomi_obs_op_adj_gridavg(thisobs, nrows, obs_f_all, state_p)

    TYPE(obs_f), INTENT(inout) :: thisobs  ! Data type with full observation
    INTEGER, INTENT(in) :: nrows           ! Number of values to be averaged
    REAL, INTENT(in)    :: obs_f_all(:)    ! Full observed state for all observation types (array provided by PDAF)
    REAL, INTENT(inout) :: state_p(:)      ! Process-local model state provided by PDAF

Note:

• The necessary index information for the observation operator was initialized in init_obs_OBSTYPE of the observation module.