Fig. 4: Isotope composition and air content of the bottom part of the ice core.
From: Rare ice-base temperature measurements in Antarctica reveal a cold base in contrast with predictions
a Air content (blue) and δ18O (red) vs. depth. b The visual appearance of the ice core. c The δD–δ18O values obtained in layers 540.50−540.77 m (cyan), 540.77-540.93 m (blue), and 540.93-541.12 m (red) are located on the local meteoric water line.
