| | 1 | = PDAF_assim_offline_enkf = |
| | 2 | |
| | 3 | This page documents the routine `PDAF_assim_offline_enkf` of PDAF. |
| | 4 | |
| | 5 | The routine is used for the offline coupled mode of PDAF, which is described on the page: [wiki:OfflineImplementationGuide Implementation Guide for Offline Coupling]. |
| | 6 | |
| | 7 | The interface when using the EnKF is the following: |
| | 8 | {{{ |
| | 9 | SUBROUTINE PDAF_assim_offline_enkf(U_init_dim_obs, U_obs_op, & |
| | 10 | U_init_obs, U_prepoststep, U_add_obs_err, U_init_obscovar, status_pdaf) |
| | 11 | }}} |
| | 12 | with the following arguments: |
| | 13 | * `U_init_dim_obs`: The name of the user-supplied routine that provides the size of observation vector |
| | 14 | * `U_obs_op`: The name of the user-supplied routine that acts as the observation operator on some state vector |
| | 15 | * `U_init_obs`: The name of the user-supplied routine that initializes the vector of observations |
| | 16 | * `U_prepoststep`: The name of the pre/poststep routine as in `PDAF_get_state` |
| | 17 | * `U_add_obs_err`: The name of the user-supplied routine that adds the observation error covariance matrix to the ensemble covariance matrix projected onto the observation space. |
| | 18 | * `U_init_obscovar`: The name of the user-supplied routine that initializes the observation error covariance matrix. |
| | 19 | * `status_pdaf`: The integer status flag. It is zero, if the routine is exited without errors. |
| | 20 | |
| | 21 | |
| | 22 | |
| | 23 | |
| | 24 | |
| | 25 | The user-supplied call-back routines are described on the page on [ImplementAnalysisenkf implementing the analysis step of the EnKF algorithm]. |
| | 26 | |
| | 27 | It is recommended that the value of `status_pdaf` is checked in the program after `PDAF_put_state_enkf` is executed. Only if its value is 0 the initialization was successful. |
