I will compare the advantages and disadvantages of 4D-Var and EnKF, and
present several examples of their application to different models, from
Lorenz 3-variable model to the Japanese Earth Simulator T159/L48 global
model. I will also discuss a low-order approach to deal with model
errors.
Eugenia Kalnay, Hong
Li, Junjie Liu, Shu-Chih Yang, Chris Danforth and Takemasa Miyoshi