Extended Data Fig. 10 | Comparison of our simulated summer temperature
for Greenland ice-core sites with the temperature reconstructions for these
sites based on δ^18 Oice. a, The simulated summer temperature ( JJA) (grey line)
and lapse-rate corrected JJA temperature (green line) compared with
reconstructed temperatures for the GISP2 ice-core site (blue symbols, 1σ
uncertainty)^66 ,^73 based on the relation dδ^18 Oice/dT = ~ 0. 5‰ C−1, which is derived
from Greenland ice-core sites elsewhere^74. Also shown are the reconstructed
temperatures using the dδ^18 Oice/dT relation established for the NEEM site
(~1. 1 ‰ C−1)^75 (red symbols, 1σ uncertainty), suggesting that the GISP2 LIG
summer temperatures are about half of the originally published values based
on the Vinther et al.^74 dδ^18 Oice/dT relation and in good agreement with our
model results. b, The simulated JJA temperature (grey line) and lapse-rate
corrected JJA temperature (green line) compared with reconstructed
temperatures for the NEEM ice-core site (dark blue line, grey shading is
uncertainty)^65 based on the relation dδ^18 Oice/dT = ~ 0. 5‰ C−1 which is derived
from Greenland ice-core sites elsewhere^74. Also shown are the reconstructed
temperatures using the dδ^18 Oice/dT relation established for the NEEM site
(~1. 1 ‰ C−1)^75 (red line, pink shading is uncertainty), suggesting that the NEEM
LIG summer temperatures are about half of the originally published values
based on the Vinther et al.^74 dδ^18 Oice/dT relation and in good agreement with our
model results. These reconstructions span the interval 127–120 ka, which is the
warmest interval in the ice-core records for the LIG suggested by this proxy.