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Specifics of 2DVar Module
Background error structures prescribed to stretch along contour lines of topography to some extent
First guess field is the original first guess for the 3DVar taken locally at the first vertical level above the Eta steps
2DVar analysis increments replace those from the original 3DVar at the vertical level used to construct the 2DVar first guess field
With the modified assimilation system, surface temperature data have a non-negative impact on the model forecast.