Changes between Initial Version and Version 1 of PDAF_assim_offline_ensrf


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Timestamp:
Apr 21, 2025, 1:56:34 PM (7 days ago)
Author:
lnerger
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  • PDAF_assim_offline_ensrf

    v1 v1  
     1= PDAF_assim_offline_ensrf =
     2
     3This page documents the routine `PDAF_assim_offline_ensrf` of PDAF. The routine is used to execute the ENSRF/EAKF filters, which were added to PDAF with version 3.0.
     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 ENSRF/EAKF is the following:
     8{{{
     9SUBROUTINE PDAF_assim_offline_ensrf(U_init_dim_obs, U_obs_op,  U_init_obs, U_init_obsvars, &
     10     U_localize_covar_serial, &
     11     U_prepoststep, outflag)
     12}}}
     13with the following arguments:
     14 * `U_init_dim_obs`: [[BR]]The name of the user-supplied routine that provides the size of observation vector
     15 * `U_obs_op`: [[BR]]The name of the user-supplied routine that acts as the observation operator on some state vector
     16 * `U_init_obs`: [[BR]]The name of the user-supplied routine that initializes the vector of observations
     17 * `U_init_obsvars`: [[BR]]The name of the user-supplied routine that initializes the vector of observation error variances.
     18 * `U_localize_covar_serial`: [[BR]]The name of the user-suppplied routine that applies the covariance localization for a single observation
     19 * `U_prepoststep`: [[BR]]The name of the user-supplied pre/poststep routine as in `PDAF_get_state`
     20 * `status_pdaf`: [[BR]]The integer status flag. It is zero, if the routine is exited without errors.
     21
     22The user-supplied call-back routines are described on the page on [wiki:ImplementAnalysisENSRF_EAKF implementing the analysis step of the ENSRF/EAKF]. Here also the possible choices of `subtype` are explained. These select the particular filter variant.
     23
     24It 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.
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