4D-Var analyses of FASTEX situations using special observations
Analyses 4D-Var de situations FASTEX utilisant des observations spéciales
Desroziers, G. ; Pouponneau, B. ; Thépaut, J.-N. ; Janiskova, M. ; Veersé, F.
Année de publication
1999
This paper focuses on Intensive Observation Period 17 of the Fronts and <br>Atlantic Storm-Track EXperiment (FASTEX): the FASTEX special soundings <br>obtained during that period are added to the conventional dataset and <br>assimilated with a 4-dimensional variational (4D-Var) scheme under <br>development at Météo-France. Results show a consistent use of the high <br>density FASTEX ship soundings by the 4D-Var formulation and an <br>improvement brought by this new scheme over 3D-Var when using only the <br>vertical profiles synchronous with synoptic time. the application of the<br> 4D-Var analysis to dropsondes launched by a system-relative flight <br>designed by the Joint Centre for Mesoscale Meteorology also produces a <br>fine-scale description of sub-structures of the mature system.</div>
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