Fig. 1
Effective lifetimes (see text for definition) as a function of altitude for oxygen species. These are calculated for OH and O(3P) input fluxes of 2.4 × 105 and 1.6 × 106 cm-2 s-1, respectively, and the H08 chemical network. The effective lifetime for CO2 for an enhanced input OH flux = 5.1 × 106 cm-2 s-1 (needed to match the CO2 profile) is also shown as a dashed black line.
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