Extended Data Fig. 6: Relationship between δO2/N2 and δDice measured from the same depth in (a) Dome Fuji16,28,39, (b) Dome C18,25,26,27,51, (c) Vostok14,29, and (d) Allan Hills S27 ice.
From: Early Pleistocene East Antarctic temperature in phase with local insolation
Only clathrate-based data from Dome Fuji, Dome C, and Vostok are used in this comparison, shown as black circles. A statistically significant (two-tailed p < 0.01) positive correlation exists in Dome Fuji (N = 366, r2 = 0.04), Dome C (N = 365, r2 = 0.05), and Vostok (N = 151, r2 = 0.16) data. Red circles in S27 indicate that gas ratio data were measured on ice samples containing bubbles because the Allan Hills S27 ice has no clathrate. The correlation is still positive and significant (N = 24, r2 = 0.27, p = 0.01). Dashed lines represent 95% confidence interval. The results show that, for 4 Antarctic ice cores, there is strong evidence for Antarctic temperature in phase with northern hemisphere insolation on orbital timescales.
