| 40 | | 1. '''Online coupling:''' [[BR]] In the online coupling mode, calls to subroutines for the data assimilation are inserted into the model code. Thesse routines call the PDAF core routines. A single data-assimilative model program |
| 41 | | 1. '''Offline coupling:''' [[BR]] In the offline coupling mode, the model is executed separately from the assimilation program. The model write restart files, which are used as inputs for the assimilation program. After computing the analysis step with the DA method, the assimilation program writes new restart files for the model, which is then started to compute the next forecast phase. In Figure 1, the model on the bottom left side is replaced by the reading and writing of files. |
| | 40 | 1. '''Online coupling:''' [[BR]] In the online coupling mode, calls to subroutines for the data assimilation are inserted into the model code. Thesse routines call the PDAF core routines. A single data-assimilative model program with ensemble integration functionality provided by PDAF is compiled. While running this single program, the necessary ensemble integrations and the actual assimilation are performed. The information transfer between the model and the data assimilation functions are performed in memory. |
| | 41 | 1. '''Offline coupling:''' [[BR]] In the offline coupling mode, the model is executed separately from the assimilation program. The model write restart files, which are used as inputs for the assimilation program. After computing the analysis step with the DA method, the assimilation program writes new restart files for the model, which is then started to compute the next forecast phase. Related to Figure 1, the model on the bottom left side is replaced by the reading and writing of files in the assimilation program, which contains the assimilation method and observations as in the case of online coupling. |
