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Training with trend
In our test of MBH in science
(2004), the trend in the
calibration period was taken out.
When the trend during the
calibration period is used as a
critical factor in the empirical
reconstruction model, then the
contamination of the proxy trend
by non-climatic signals must be
Thus, we introduced an error on
the centennial time scale as red
Here: 50% centennial,
75% year-to-year.
Again heavy underestimation of
long-term variability.