Reference: Jacoby and D'Arrigo, 1989; D'Arrigo and
Jacoby, 1992; 1993
Proxy Type: tree-ring widths
Standardized 400-year proxy climate records reflecting surface air temperature for
sites from Arctic Europe east to western Canada (Fig. 1; Table 1; 18). Red indicates
temperatures greater than one standard deviation warmer than average for the reference
period (1901-1960), whereas dark blue indicates at least one standard deviation colder
than this average. All series presented as five-year averages (see paper for more
explanation)²