Explaining IBZ + dRIX correction procedure:
From Predicted Climate at Mast position we obtain the following parameters:
U also called U(IBZ) in the exercise
RIX
dRIX
Using the dRIX we obtain a prediction error, P, from the provided graph (in the exercise).
We apply the dRIX correction with expression: U(RIX) = U(IBZ) / (P+1)
Example: prediction of Mast 10 from Mast 6
U(IBZ) = 4.63
RIX = 13,4
dRIX = -20
P = ~21%
U(RIX) = 5.86
Regards
Alexandre