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Jupiter's moon Europa has a subsurface ocean, the chemistry of which islargely unknown. Carbon dioxide (CO$_2$) has previously been detected on thesurface of Europa, but it was not possible to determine whether it originatedfrom subsurface ocean chemistry, was delivered by impacts, or was produced onthe surface by radiation processing of impact-delivered material. We map thedistribution of CO$_2$ on Europa using observations obtained with the JamesWebb Space Telescope (JWST) and find a concentration of CO$_2$ within TaraRegio, a recently resurfaced terrain. This indicates the CO$_2$ is derived froman internal carbon source. We propose the CO$_2$ formed in the internal ocean,though we cannot rule out formation on the surface by radiolytic conversion ofocean-derived organics or carbonates.

The distribution of CO$_2$ on Europa indicates an internal source of carbon