Fig. 5. In a H2O/CO2 vs. CO2/SO2 scatter plot, Stromboli's plume gas emissions are shown to range from CO2-rich to H2O-rich. The syn-explosive (black circles) and quiescent (open circles) plumes have distinct compositions, with some overlap. Grey circles are FTIR-sensed gas compositions for Strombolian explosions (Burton et al., 2007b). Curves labelled “Mixing lines” are calculated as described in the caption of Fig. 8, and in Section 5.2.
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