3D GCM modeling of K2-18b finds that transport-induced disequilibrium raises upper-atmosphere CO and CO2 to ~10^{-3} while horizontal winds homogenize composition, yielding spectra that match JWST observations.
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Three-dimensional transport-induced chemistry on temperate sub-Neptune K2-18b, Part II: the combined effects of atmospheric dynamics and chemical reactions
3D GCM modeling of K2-18b finds that transport-induced disequilibrium raises upper-atmosphere CO and CO2 to ~10^{-3} while horizontal winds homogenize composition, yielding spectra that match JWST observations.