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Figure 17 – Time series of the non-seasalt sulfate (SO 42-, red line) and nitrate (NO3-, blue line) concentrations at ice core site 20D, southern Greenland. To remove seasonal signals, data have been smoothed to 1 year from the original ~5.8 samples per year. Examples of volcanic events recorded in nss sulfate spikes are: (1) Laki (1783); (2) Tambora (1815); (3) Katmai (1912). Modified from Mayewski et al. (1990). |
