Previous analyses of Coppermine and Thelon ring - width data, in combination with ring width data from 2 other
sites in the western NWT (R. Wilson unpublished report, 2005; D'Arrigo et al., 2006) revealed that the Regional Curve Standardization (RCS) method, a
potentially useful technique for retaining centennial - scale climatic trends in tree rings (Briffa et al., 1992; Cook et al., 1995; Esper et al., 2002), did not appear to preserve any additional low - frequency information at these
sites when compared to more traditional techniques.