Bottom (e): Dust concentration in the Vostok ice core for the past ~420,000 years in parts per million. Top (a): Hydrogen isotope ratios ( deuterium) -- the more negative the ratio, the colder the temperature.
Source: J. R. Petit et al., "Climate and Atmospheric History of the Past 420,000 Years from the Vostok Ice Core, Antarctica," Nature Vol. 399 (June 3, 1999), Fig. 2, p. 430 (simplified).
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Last modified by pib on September 13, 2000.