Changes between Initial Version and Version 1 of PDAFomi_obs_op_adj_interp_lin

Timestamp:

Dec 18, 2021, 1:20:45 PM (3 years ago)

Author:

lnerger

Comment:

--

PDAFomi_obs_op_adj_interp_lin

@@ +1 @@
+= PDAFomi_obs_op_adj_interp_lin =
+
+This page documents the routine `PDAFomi_obs_op_adj_interp_lin` of PDAF-OMI.
+
+The routine provides an adjoint observation operator for observations that are computed as the linear interpolation between some grid point values in the state vector. It is usually called in `obs_op_OBSTYPE` in an [wiki:OMI_observation_modules OMI observation module] if a 3D-Var method is used.
+
+|| See the [wiki:OMI_observation_operators page describing PDAF-OMI observation operators] for a general overview.||
+
+The interface is:
+{{{
+  SUBROUTINE PDAFomi_obs_op_adj_interp_lin(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.
+ * The interpolation coefficients have to be initialized in `init_ob_OBSTYPE` of the observation module.