Changes between Version 3 and Version 4 of ImplementAnalysisestkf


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Timestamp:
Apr 30, 2014, 9:41:08 PM (6 years ago)
Author:
lnerger
Comment:

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  • ImplementAnalysisestkf

    v3 v4  
    2929== Overview ==
    3030
    31 With Version 1.8 of PDAF, the ESTKF [Error Subspace Transform Kalman Filter] algorithm has been introduced. The user-supplied routines required for the ESTKF are identical to those required for the SEIK filter.
    32 
    33 For the analysis step of the ESTKF different operations related to the observations are needed. These operations are requested by PDAF by call-back routines supplied by the user. Intentionally, the operations are split into separate routines in order to keep the operations rather elementary. This procedure should simplify the implementation. The names of the required routines are specified in the call to the routine `PDAF_put_state_estkf` that was discussed before. With regard to the parallelization, all these routines are executed by the filter processes (`filterpe=.true.`) only.
    34 
    35 For completeness we discuss here all user-supplied routines that are specified in the interface to PDAF_put_state_estkf. Thus, some of the user-supplied routines that are explained on the page explaining the modification of the model code for the ensemble integration are repeated here.
     31With Version 1.8 of PDAF, the ESTKF [Error Subspace Transform Kalman Filter] algorithm has been introduced. The user-supplied routines required for the ESTKF are identical to those required for the SEIK filter and amost identical to those required for the ETKF method.
     32
     33For the analysis step of the ESTKF different operations related to the observations are needed. These operations are requested by PDAF by call-back routines supplied by the user. Intentionally, the operations are split into separate routines in order to keep the operations rather elementary and efficient. This procedure should simplify the implementation. The names of the required routines are specified in the call to the routine `PDAF_put_state_estkf` that was discussed before. With regard to the parallelization, all these routines are executed by the filter processes (`filterpe=.true.`) only.
     34
     35For completeness we discuss here all user-supplied routines that are specified in the interface to PDAF_put_state_estkf. Thus, some of the user-supplied routines that are explained on the page decribing the modification of the model code for the ensemble integration are repeated here.
    3636
    3737The ESTKF and the ETKF (Ensemble Transform Kalman Filter) are very similar. For this reason, the interface to the user-supplied routines is almost identical. Depending on the implementation it can be possible to use identical routines for the ESTKF and the ETKF. Differences are marked in the text below.