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

"Generate a long time series of model forecast minus reanalysis from the training period

3. Low-dim method (Danforth et al, 2007: Estimating and correcting global weather model error. Mon. Wea. Rev)

t=0

t=6hr

model

Model error estimation schemes (LDM)

We collect a large number of estimated errors and estimate bias, etc.

NNR

Time-mean model bias

Diurnal model error

State dependent model error

Forecast error due to error in IC

NNR