From the top down, the first and third curves show carbon dioxide and methane in the air enclosed in the ice core from Vostok, Antarctica. The second curve represents changes in temperature at the top of the inversion layer over Vostok as deduced from isotope ratios of the ice. The curve at the bottom shows oxygen-isotope ratios in a marine sediment core.
Source: Claude Lorius and Jean Jouzel, "European Project for Ice Coring in Antarctica (EPICA)," in G. Hempel, ed., The Ocean and the Poles (Gustav Fischer, 1995), p. 268.
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Last modified by pib on October 28, 2003.