Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 5.4: (a) Sulphate concentrations in several Greenland ice cores and an Alpine ice core (Fischer et al., 1998; Döscher et al., 1995).
Also shown are the total SO2 emissions from sources from the US and Europe (Gschwandtner et al., 1986; Mylona, 1996). The inset shows how peaks due to major volcanic eruptions have been removed by a robust running median method followed by singular spectrum analysis.
(b) Black carbon and organic carbon concentrations in alpine ice cores (Lavanchy et al., 1999).

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