Changes between Version 23 and Version 24 of ModifyModelforEnsembleIntegration


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Timestamp:
Sep 4, 2010, 6:35:15 PM (10 years ago)
Author:
lnerger
Comment:

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  • ModifyModelforEnsembleIntegration

    v23 v24  
    5555In this example, which is taken from the example implementation in `testsuite/src/dummymodel_1D`, we use an unconditional DO loop (while loop). The exit flag `doexit` for this loop is set within `PDAF_get_state`. In addition, the variable `nsteps` is initialized, which defines the number of time steps to be performed during the current forecast phase. Thus, we only execute the time stepping code if `nsteps>0`. (If this has to be implemented using an IF-clause as in the example should be checked for the particular code).
    5656
    57 == PDAF_get_state ==
     57== `PDAF_get_state` ==
    5858
    5959The routine `PDAF_get_state` has the purpose to initialize the information, whether further model integrations have to be computed and how many time steps have to be performed. In addition, the model fields to be propagated are initialized from the array holding the ensemble states.
     
    7373 * `status`: The integer status flag. It is zero, if `PDAF_get_state` is exited without errors.
    7474
    75 == PDAF_put_state_X ==
    76 
    77 There is a separate routine `PDAF_put_state_*` for each of the filter algorithms. The name of the routine includes the name of the filter at its end. The purpose of the `PDAF_put_state_*` routines is to write back the forecast model fields into the array holding the ensemble of model state vectors. In addition, the routine checks if the current forecast phase is completed. If not, the routine is exited and the next cycle of the ensemble loop is performed. If the current forecast phase is completed, the routine executes the analysis step of the chosen filter algorithm. The interface to each put-state routine is specific for each filter algorithm, because the names of several user-supplied routines have to be specified, which are specific for each filter algorithm. However, at the stage of implementing the ensemble integration only the first and last arguments of the routines are relevant.
     75== `PDAF_put_state_X` ==
     76
     77There is a separate routine `PDAF_put_state_X` for each of the filter algorithms. The name of the routine includes the name of the filter at its end (instead of `X`). The purpose of the `PDAF_put_state_X` routines is to write back the forecast model fields into the array holding the ensemble of model state vectors. In addition, the routine checks if the current forecast phase is completed. If not, the routine is exited and the next cycle of the ensemble loop is performed. If the current forecast phase is completed, the routine executes the analysis step of the chosen filter algorithm. The interface to each put-state routine is specific for each filter algorithm, because the names of several user-supplied routines have to be specified, which are specific for each filter algorithm. However, at the stage of implementing the ensemble integration only the first and last arguments of the routines are relevant.
    7878
    7979For example, the interface when using the SEIK filter is the following: