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Moist Convection Induced Local Enhancement of Carbon Monoxide – Implications for the Deep Water Abundance

Presentation #505.04D in the session Origin and Evolution of Giant Planet Systems I (Oral Presentation)

Published onOct 23, 2023
Moist Convection Induced Local Enhancement of Carbon Monoxide – Implications for the Deep Water Abundance

Jupiter exhibits dynamical as well as chemical trends in its atmosphere that have been observed by ground-based observatories and spacecraft alike. These observations are limited to the upper layers of the atmosphere and are therefore subject to the atmospheric processes that dominate the cloud layers. Observations of carbon monoxide (CO), which are closely tied to deep atmospheric behavior and Jupiter’s oxygen inventory, are thus dependent on modeled cloud microphysics and subsequent dynamical processes. Conventional 1D chemical-diffusion modeling, which attempts to constrain deep atmospheric behavior using disequilibrium species such as CO, is limited to a simplified dynamical framework. Here, we simulate the behavior of CO at the water cloud level in the context of chemical processes and moist convective activity. We use the chemical relaxation approach using the hydrodynamical model, Simulating Non-hydrostatic Atmospheres on Planets (SNAP, Li & Chen (2019)). We find that the overall planetary water content, which is a tracer for Jupiter’s protosolar oxygen abundance, has a noticeable effect on the disequilibrium gas across the water lifting condensation level (LCL). We also find the mechanism through which CO is delivered to regions above the water cloud level when strong convective inhibition is present. Our work highlights the importance of studying disequilibrium thermochemistry with complete hydrodynamics to incorporate the effects of compositional gradients due to phase changes at the cloud levels. Our findings can be extended to the other outer Solar System planets, and can be used to constrain exoplanetary climates as well.

A. Hyder was supported by the NASA Fellowship Activity grant# 80NSSC20K1456.

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