Figure 7
Correlation plot of N2O vs CO2 from Flitch of Bacon (0.5 × 2.0 m passage) for two time periods; autumn 5/3/15–18/4/15, least squares line fit (red), n = 935 and winter 30/6/15–17/7/15, least squares line fit (blue), n = 358. Data points are colour coded to represent air-flow direction and velocity. Only air from above Chifley Cave (ambient + soil air, red) contains N2O greater than ambient, indicative of soil air. Air-flow in the opposite direction (blue) is tightly clustered around ambient composition with no addition or depletion of N2O within Chifley Cave.
