Changes between Initial Version and Version 1 of PDAF_prepost_si


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Timestamp:
Jan 16, 2015, 11:09:50 AM (6 years ago)
Author:
lnerger
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  • PDAF_prepost_si

    v1 v1  
     1= PDAF_prepost_si =
     2
     3This page documents the routine `PDAF_prepost_si` of PDAF.
     4
     5`PDAF_prepost_si` is the variant of [wiki:PDAF_prepost PDAF_prepost] with the [PdafSimplifiedInterface simplified interface]. The difference between both routines is that in the simplified interface the names of the call-back subroutines are not specified. Instead the routine assumes that the call-back routines have a standard name as specified at the end of this page.
     6
     7The routine is typically called in `assimilate_pdaf` or directly in the model code.
     8
     9The routine `PDAF_prepost_si` is an alternative to the routines `PDAF_assimilate_X_si` where 'X' is the name of a filter method.
     10The routine can be used with the 'fully parallel' implementation variant of PDAF. The purpose of `PDAF_prepost_si` is to collect the ensemble information on the processes usually doing the filter analysis. However, in the case of `PDAF_prepost_si`, no filter analysis step is performed when the ensemble integration is complete, but only the user-supplied pre/poststep routine is called to allow the user to analyze the forecast ensemble.
     11
     12The 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 routine `PDAF_prepost` is used.
     13
     14
     15The interface is the following:
     16{{{
     17  SUBROUTINE PDAF_prepost_si(status_pdaf)
     18}}}
     19with the following arguments:
     20 * `status_pdaf`: The integer status flag. It is 0, if `PDAF_put_state_prepost_si` is exited without errors.
     21
     22
     23The routine calls two user-supplied call-back routines. They are described, for example, on the page on [ImplementAnalysisestkf implementing the analysis step of the ESTKF algorithm].
     24
     25It is recommended that the value of `status_pdaf` is checked in the program after `PDAF_prepost_si` is executed. Only if its value is 0 the initialization was successful.