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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