The simple ensemble method with bias-corrected data is defined as
![Eb](/uploads/Legacy/_images/multi_model/clip_image100.gif)
is the bias-corrected ensemble mean,
![segment Fi](/uploads/Legacy/_images/multi_model/clip_image102.gif)
is the mean of i-th forecast over the training period,
![segment O](/uploads/Legacy/_images/multi_model/clip_image103.gif)
is the observed mean over the training period. The systematic errors for forecast models can be removed due to anomaly term, (
![Fi-segment Fi](/uploads/Legacy/_images/multi_model/clip_image104.gif)
), which accounts model's own seasonal climatology.