NCEP-R2:
- coarsest data set (horizontal and vertically)
- assimilates limited amount of satellite observation
ERA-Interim:
- four dimensional variational analysis
- 4D var assimilation method
- bias correction method (related to satellite radiances)
NCEP-CFSR:
- coupled atmosphere-ocean-sea ice land model
- bias correction method (related to satellite radiances)
- highest resolution
- increased usage of satellite observations
NASA-Merra:
- 3D-var data assimilation
- flow dependent , anistropic and inhomogeneous background error co-variances
- nudging technique from model to observation state
Evaluation Ideas
RMSE
Bias
STD
R
- 4 wind speed bins (wind and direction)
- 4 wind directions (wind and direction)
PDF (wind speed vs. Frequency)
Data Available