Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 4.2: Change in N2O abundance for the last 1,000 years as determined from ice cores, firn, and whole air samples. Data sets are from: Machida et al. (1995); Battle et al. (1996); Langenfelds et al. (1996); Steele et al. (1996); Flückiger et al. (1999). Radiative forcing, approximated by a linear scale, is plotted on the right axis. Deseasonalised global averages are plotted in the inset (Butler et al., 1998b).

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