Figure 2 | Scientific Reports

Figure 2

From: Seasonal total methane depletion in limestone caves

Figure 2

CH4 and CO2 CRDS continuous measurements (8 minute averages, recorded hourly) from LKB in Chifley Cave over 3 years from September 2012 to August 2015. Methane measurement error ± 20 ppb and carbon dioxide ± 5 ppm. Winter air-flow (blue infill) shows external ambient air drawn into Chifley Cave from the “Grand Arch” cave entrance has a greater velocity and longer duration than Summer air-flow (red infill) in the opposite direction. External weather has a direct immediate impact on cave CO2 & CH4 (eg. week 1 February 2015) linking cave trace gas composition to external weather and climate.

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