Fig. 6: Vent-specific molar compositions and degassing pressures model.
From: Combined ground and aerial measurements resolve vent-specific gas fluxes from a multi-vent volcano
a Summary of vent-specific molar gas compositions during passive and explosive degassing. The elevated CO2 composition of N2 compared to C and S1 is evident. The composition of explosive gas emissions from N2 indicates elevated CO2 composition relative to the preceding and/or succeeding passive emissions in the same flight. b Degassing pressures: Measured passive/non-explosive gas compositions superposed on modelled gas compositions, expressed as CO2/SO2 (solid line) and H2O/CO2 (dashed line) during closed system degassing from 100 to 0.1 MPa buffered at NNO (nickel–nickel oxide redox buffer). See methods for details of model starting composition. Increasing equilibrium pressures (i.e. shallower depths of degassing) are observed from C to S1 to N2.
