Figure 3. Comparison of ice-core CO₂ record of Barnola et al. (1987) with surface water pCO₂ estimates for Core GeoB 1016-3, using conversion for delta¹³C of organic matter to CO₂ pressure as proposed by Popp et al. (1989) and Rau et al. (1991). Time scale of Vostok ice core adjusted for best fit. (From Müller et al., 1994).

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