Changes between Initial Version and Version 1 of PDAF3_assim_offline_3dvar


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Timestamp:
Apr 21, 2025, 1:34:00 PM (7 days ago)
Author:
lnerger
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  • PDAF3_assim_offline_3dvar

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     1= PDAF3_assim_offline_3dvar =
     2
     3This page documents the routine `PDAF3_assim_offline_3dvar` of PDAF. The routine is part of the advanced PDAF3 interface that was introduced with PDAF V3.0.
     4
     5The routine is used for the offline coupled mode of PDAF, which is described on the page: [wiki:OfflineImplementationGuide Implementation Guide for Offline Coupling].
     6
     7The interface for using the parameterized 3D-Var is:
     8{{{
     9  SUBROUTINE PDAF3_assim_offline_3dvar(U_init_dim_obs_pdafomi, U_obs_op_pdafomi, &
     10                                 U_cvt, U_cvt_adj, U_obs_op_lin_pdafomi, obs_op_adj_pdafomi, &
     11                                 U_prepoststep, outflag)
     12}}}
     13with the following arguments:
     14 * `U_init_dim_obs_pdafomi`: [[BR]]The name of the user-supplied routine that initializes the observation information and provides the size of observation vector. This routine is part of an OMI observation module.
     15 * `U_obs_op_pdafomi`: [[BR]]The name of the user-supplied routine that acts as the observation operator on some state vector. This routine is part of an OMI observation module.
     16 * `U_cvt`: The name of the user-supplied routine that applies the control-vector transformation (square-root of the B-matrix) on some control vector to obtain a state vector.
     17 * `U_cvt_adj`: The name of the user-supplied routine that applies the adjoint control-vector transformation (with square-root of the B-matrix) on some state vector to obtain the control vector.
     18 * `U_obs_op_pdafomi`: The name of the user-supplied routine that acts as the observation operator on some state vector.  This routine is part of an OMI observation module.
     19 * `U_obs_op_lin_pdafomi`: The name of the user-supplied routine that acts as the linearized observation operator on some state vector.  This routine is part of an OMI observation module.
     20 * `U_obs_op_adj_pdafomi]: The name of the user-supplied routine that acts as the adjoint observation operator on some state vector. This routine is part of an OMI observation module.
     21 * `U_prepoststep`: [[BR]]The name of the user-supplied pre/poststep routine as in `PDAF_get_state`
     22 * `status`: [[BR]]The integer status flag. It is zero, if the routine is exited without errors. It is recommended that the value of `status_pdaf` is checked in the program after the routine is executed. Only if its value is 0 the initialization was successful.
     23
     24The user-supplied call-back routines are described on the page on [ImplementAnalysis_3DVar implementing the analysis step of 3D-Var with OMI].
     25