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
(b) Black carbon and organic carbon concentrations in alpine ice cores (Lavanchy
et al., 1999).