Fig. 7
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Comparisons of UVC results with modern CH4 abundances (top row) with incident top-of-atmosphere (TOA) UVC flux and surface UVC flux for all hosts with modern levels of CH4 at different O2 levels, and surface UVC flux with varying CH4 for 100% PAL O2 (second row), 10% PAL O2 (third row) and 0.1% PAL O2 (bottom row). Surface UVC plots from Kozakis et al. (2022) use the same y-axis limits as the corresponding plots in the bottom three rows to enable easier comparison. Changes in UVC surface flux are most significant for 100% PAL O2 due to the dependency of oxygen to convert CH4 into H2O and HO2.
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