Changes between Initial Version and Version 1 of PDAF3_assim_offline_enkf_nondiagR


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Timestamp:
Apr 21, 2025, 1:32:51 PM (7 days ago)
Author:
lnerger
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  • PDAF3_assim_offline_enkf_nondiagR

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     1= PDAF3_assim_offline_enkf_nondiagR =
     2
     3This page documents the routine `PDAF3_assim_offline_enkf_nondiagR` of PDAF. The routine is part of the advanced [wiki:PDAF3_interface PDAF3 interface] that was introduced with PDAF V3.0.
     4
     5The routine is used to execute the analysis step of the EnKF and LEnKF of a non-diagonal observation error covariance matrix.
     6
     7The routine is used for the offline coupled mode of PDAF, which is described on the page: [wiki:OfflineImplementationGuide Implementation Guide for Offline Coupling].
     8
     9The interface is:
     10{{{
     11  SUBROUTINE PDAF3_assim_offline_enkf_nondiagR(U_init_dim_obs_pdafomi, U_obs_op_pdafomi, &
     12                                 U_add_obs_err_pdafomi, U_init_obscovar_pdafomi, &
     13                                 U_prepoststep, status)
     14}}}
     15with the following arguments:
     16 * `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.
     17 * `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.
     18 * `U_add_obs_err_pdafomi`: [[BR]]The name of the user-supplied routine that adds the observation error covariance matrix to the ensemble covariance matrix projected onto the observation space.
     19 * `U_init_obscovar_pdafomi`: [[BR]]The name of the user-supplied routine that initializes the observation error covariance matrix.
     20 * `U_prepoststep`: [[BR]]The name of the user-supplied pre/poststep routine as in `PDAF_get_state`
     21 * `status`: [[BR]]The integer status flag. It is zero, if the routine is exited without errors.
     22
     23Notes:
     24 * The difference to the routine `PDAF3_assim_offline_global` used for diagdonal R-matrices is only in the additonal arguments `U_add_obs_err_pdafomi` and `U_init_obscovar_pdafomi`.
     25 * The global filters ESTKF, ETKF, and SEIK use the separate routine [wiki:PDAF3_assim_offline_global_nondiagR].
     26 * The global filters NETF and PF use the separate routine [wiki:PDAF3_assim_offline_nonlin_nondiagR].
     27 * 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.
     28
     29The user-supplied call-back routines are described on the page on [ImplementAnalysisGlobal implementing the analysis step of the global filters].
     30