PowerPoint Presentation - COMPARISON OF ENSEMBLE-BASED AND VARIATIONAL-BASED DATA ASSIMILATION SCHEMES IN A QUASI-GEOSTROPHIC MODEL

LETKF minimizes the errors of the day and thus provides an excellent first guess to the 3D-Var analysis

3DVar with the background provided from LETKF (forecast mean)

3DVar

3DVar with the background of the first 50 days provided from LETKF

LETKF

We conclude from this experiment that the errors of the day (and not just ensemble averaging) are important in LETKF and 3D-Var.