Fig. 8

CO₂ and H₂S signals detected (by using Multi-GAS) in 215 in-plume measurements close to “WJ” vent at Furnas Lake site. a CO₂ signal (red curve) and H₂S signal (black curve) are expressed in ppm. b Correlation between two signals. In this plot (~7 min of data acquisition), the CO₂/H₂S (molar ratio) is 350 (close to the mean ratio value found in the entire acquired measurements) and the R ² regression line is ~0.62