The interaction between model resolution, observation and observation density in data assimilation : a one-dimensional study
L'interaction entre la résolution du modèle, les observations et la densité des observations dans l'assimilation des données : une étude uni-dimensionnelle
Liu, Z. ; Rabier, F.
Année de publication
2002
In this paper, the optimal configurations of model resolution, <br>observation resolution and observation density are investigated in a <br>simple one-dimensional framework. In this context, the <br>representativeness error is formalized and estimated before being used <br>in the analysis-error formulation. Some optimal and suboptimal <br>assimilation-schemes, differing from different approximations of <br>observation-error covariance and observation operator, are compared. The<br> optimal observation-extent is determined as a function of model <br>resolution. Increasing the observation density is usually beneficial, <br>except for suboptimal schemes similar to the ones used in operational <br>practice. The impact of thinning the observations with correlated error <br>is also studied from a suboptimal viewpoint. <br>Copyright © 2002 Royal <br>Meteorological Society</div>
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