Impact of a simplified physical package in 4D-Var analyse of FASTEX situations
Impact d'un logiciel physique simplifié dans l'analyse 4D-Var des situations FASTEX
Janiskova M. ; Veersé, F. ; Thépaut, J.-N. ; Desroziers, G. ; Pouponneau, B.
Année de publication
1999
In the context of the FASTEX (Fronts and Atlantic Storm-Track <br>EXperiment), this paper presents a number of tests and validations of <br>the four-dimensional variational (4D-Var) data assimilation system under<br> development at Météo-France, over the Intensive Observation Periods <br>IOP3 and IOP17, in particular the impact of adding a simplified physical<br> package within the incremental approach. the impact of using a 6-hour <br>4D-Var system (instead of a standard optimum interpolation or a 3D-Var <br>scheme) is positive for the description and the forecast of Atlantic <br>cyclones. Moreover, despite the lack of tuning and remaining <br>deficiencies in the parametrization schemes. the analysis and prediction<br> of Atlantic cyclones seem better handled with a 4D-Var system including<br> physical processes in the assimilating model.</div>
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