Jean-François Caron, Data Assimilation and Satellite Meteorology Research Section, Environment Canada, Canada

Scale-Dependent Spatial Covariance Localization in Ensemble-Variational Data Assimilation

Mark Buehner


A new approach for efficiently applying scale-dependent spatial covariance localization within EnVar data assimilation system will be presented. More severe localization is applied to small scales and less localization to large scales within the same single analysis procedure. It will be shown that this approach can easily be applied to both horizontal and vertical covariance localization. Examples will be given using single observation data assimilation experiments and the impact in a quasi-operational configuration of Environment Canada global forecasting system will also be addressed.

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