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CO2 ice is present on the trailing hemisphere of Ariel but is mostly absentfrom its leading hemisphere. The leading/trailing hemispherical asymmetry inthe distribution of CO2 ice is consistent with radiolytic production of CO2,formed by charged particle bombardment of H2O ice and carbonaceous material inAriel's regolith. This longitudinal distribution of CO2 on Ariel was previouslycharacterized using 13 near-infrared reflectance spectra collected at 'low'sub-observer latitudes between 30S to 30N. Here, we investigated thedistribution of CO2 ice on Ariel using 18 new spectra: two collected over lowsub-observer latitudes, five collected at 'mid' sub-observer latitudes (31 -44N), and eleven collected over 'high' sub-observer latitudes (45 - 51N).Analysis of these data indicates that CO2 ice is primarily concentrated onAriel's trailing hemisphere. However, CO2 ice band strengths are diminished inthe spectra collected over mid and high sub-observer latitudes. Thissub-observer latitudinal trend may result from radiolytic production of CO2molecules at high latitudes and subsequent migration of this constituent to lowlatitude cold traps. We detected a subtle feature near 2.13 microns in twospectra collected over high sub-observer latitudes, which might result from a'forbidden' transition mode of CO2 ice that is substantially stronger in wellmixed substrates composed of CO2 and H2O ice, consistent with regolith-mixedCO2 ice grains formed by radiolysis. Additionally, we detected a 2.35-micronfeature in some low sub-observer latitude spectra, which might result from COformed as part of a CO2 radiolytic production cycle.

A CO2 cycle on Ariel? Radiolytic production and migration to low latitude cold traps