Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 10: Variations in atmospheric CO2 concentration on different time-scales. (a) Direct measurements of atmospheric CO2. (b) CO2 concentration in Antarctic ice cores for the past millenium. Recent atmospheric measurements (Mauna Loa) are shown for comparison. (c) CO2 concentration in the Taylor Dome Antarctic ice core. (d) CO2 concentration in the Vostok Antarctic ice core. (Different colours represent results from different studies.) (e to f) Geochemically inferred CO2 concentrations. (Coloured bars and lines represent different published studies) (g) Annual atmospheric increases in CO2. Monthly atmospheric increases have been filtered to remove the seasonal cycle. Vertical arrows denote El Niño events. A horizontal line defines the extended El Niño of 1991 to 1994. [Based on Figures 3.2 and 3.3]

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