Changes between Initial Version and Version 1 of PDAFomi_put_state_nonlin_nondiagR


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Timestamp:
Sep 8, 2024, 4:39:21 PM (11 days ago)
Author:
lnerger
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  • PDAFomi_put_state_nonlin_nondiagR

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     1= PDAFomi_put_state_nonlin_nondiagR =
     2
     3This page documents the routine `PDAFomi_put_state_nonlin_nondiagR` of PDAF. The routine is used to execute the analysis step of the nonlinear filters NETF and PF with PDAF-OMI for the case of a non-diagonal observation error covariance matrix. This routine was introduced with PDAF V2.3.
     4
     5The routine is typically called in `assimilate_pdaf` or directly in the model code.
     6
     7The routines `PDAF_put_state_*` are used with the 'flexible' implementation variant of PDAF.
     8The general aspects of the filter specific routines `PDAF_put_state_*` are described on the page [ModifyModelforEnsembleIntegration Modification of the model code for the ensemble integration] and its sub-page on [InsertAnalysisStep inserting the analysis step]. For the 'fully parallel' implementation variant the alternative routines `PDAF_assimilate_*` are used.
     9Here, we list the full interface of the routine.
     10
     11The interface is:
     12{{{
     13  SUBROUTINE PDAFomi_put_state_nonlin_nondiagR(U_collect_state, &
     14                                 U_init_dim_obs_pdafomi, U_obs_op_pdafomi, &
     15                                 U_likelihood_pdafomi, U_prepoststep, status)
     16}}}
     17with the following arguments:
     18 * `U_collect_state`: The name of the user-supplied routine that initializes a state vector from the array holding the ensemble of model states from the model fields. This is basically the inverse operation to `U_distribute_state` used in `PDAF_get_state` as well as here.
     19 * `U_init_dim_obs_pdafomi`: The name of the user-supplied routine that initializes the observation information and provides the size of observation vector
     20 * `U_obs_op_pdafomi`: The name of the user-supplied routine that acts as the observation operator on some state vector
     21 * `U_likelihood_pdafomi`: The name of the user-supplied routine that compute the likelihood of an ensemble state.
     22 * `U_add_obs_error_pdafomi`: The name of the user-supplied routine that computes the product of the inverse of the observation error covariance matrix with some matrix provided to the routine by PDAF.
     23 * `U_prepoststep`: The name of the pre/poststep routine as in `PDAF_get_state`
     24 * `status`: The integer status flag. It is zero, if this routine is exited without errors.
     25
     26Notes:
     27 * The difference to the routine `PDAFomi_put_state_global` used for diagonal R-matrices is only in the additonal argument `U_likelihood_pdafomi`.
     28 * The global filters ESTKF, ETKF, and SEIK use the separate routine [wiki:PDAFomi_put_state_global_nondiagR PDAFomi_put_state_global_nondiagR].
     29 * The filter EnKF uses the separate routine [wiki:PDAFomi_put_state_enkf_nondiagR PDAFomi_put_state_enkf_nondiagR].
     30
     31The user-supplied call-back routines are described on the page on [ImplementAnalysisGlobal implementing the analysis step of the global filters].
     32
     33It is recommended that the value of `status_pdaf` is checked in the program after this routine is executed. Only if its value is 0 the initialization was successful.
     34
     35PDAF also has a [PdafSimplifiedInterface Simplified Interface] providing the routine `PDAFomi_put_state_nonlin_nondiagR_si`. In the simplified interface, the name of the user-supplied routines have predefined names and do not appear in the call to `PDAFomi_put_state_nonlin_nondiagR_si`.  More information on the pre-defined names is provided in the [ImplementAnalysisGlobal page on implementing the analysis step of the global filters].
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     37