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Pearson's correlation coefficients between Betula nana ring-width chronology (black = undetrended; grey = detrended) and monthly air temperature, including two seasonal averages for winter (previous December and current January) and summer (current June and July), derived from Arctic Station (Disko Island, western Greenland) for (a) 1910–2011, (b) 1910–1930, (c) 1931–1960, (d) 1961–1990 and (e) 1991–2011. Significance levels (P < 0.05) are indicated by horizontal dashed lines.
