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The set of re-forecast ensembles is based on previous dates which can stretch back several decades. They differ in number and detail according to the IFS model configuration and are the basis for deriving the corresponding model climates. These are described in the relevant section for medium range M-climate, sub-seasonal range ER SUBS-M-climate , and seasonal S-M-climate .
The procedures adopted for using re-forecasts allow for seasonal variations and model changes to be taken into account. But note the model climates (M-climate, ER SUBS-M-climate, or S-M-climate) can nevertheless be different from the observed climate.
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