Sentences with phrase «principal calibration period»
That is the principal calibration period.
https://judithcurry.com/ Not exact matches
«The principal difficulty is that the divergence disallows the direct calibration of tree growth indices with instrumental temperature data over recent decades (the period of greatest warmth over the last 150 years), impeding the use of such data in climatic reconstructions.»
The reason given in Briffa 2001 for their selection of a certain reconstruction is discussed: >> > The selection of a single reconstruction of the ALL temperature series is clearly somewhat arbitrary... The method that produces the best fit in the calibration period is principal component regression... << >> ``... we note that the 1450s were much cooler in all of the other (i.e., not PCA regression) methods of producing this curve...» << <
The selection of a single reconstruction of the ALL temperature series is clearly somewhat arbitrary... The method that produces the best fit in the calibration period is principal component regression...
If these simulated proxies are standardized as anomalies with respect to a calibration period and used to form principal components, the first component tends to exhibit a trend, even though the proxies themselves have no common trend.