Fig. 5: Molar gas compositions for UAS overflight on 10/06/18.
From: Combined ground and aerial measurements resolve vent-specific gas fluxes from a multi-vent volcano
Molar gas composition data for an UAS overflight on 10/06/18 during passive degassing and a Strombolian explosion from vent N2, showing gas concentration timeseries for a SO2 and CO2, b SO2 and H2O. The shaded band at the top indicates passive (grey) and explosive (black) phases. Note the drop in magmatic gas concentrations to background immediately prior to the first explosion (shaded column). c, d Scatterplots for the explosive phase emissions of SO2–CO2 and SO2–H2O, respectively, displaying the least squares regression and 95% confidence intervals. Excess refers to the concentration of the gas species of interest above background, which was determined from clean air measurements made outside of the plume where SO2 = 0. Gas molar ratios correspond to the gradient of the regression line shown. Note that for SO2–H2O, the regression is only based on SO2 > 10 ppm due to the highly variable H2O at low SO2 concentrations. Inset scatterplots show data for the passive degassing phase. See also Supplementary Fig. 2, for UAS overflight on 10/06/18 during passive degassing and a Strombolian explosion from vent N2.
