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Rotation reduces convective mixing in Jupiter and other cold gas giants

Presentation #302.06 in the session Giant Planet Interior Structure and Dynamics (Oral Presentation)

Published onOct 23, 2023
Rotation reduces convective mixing in Jupiter and other cold gas giants

Recent measurements of Jupiter’s gravitational moments by the Juno spacecraft and seismology of Saturn’s rings suggest that the primordial composition gradients in the deep interior of these planets have persisted since their formation. One possible explanation is the presence of a double-diffusive staircase below the planet’s outer convection zone, which inhibits mixing across the deeper layers. However, hydrodynamic simulations have shown that these staircases are not long-lasting and can be disrupted by overshooting convection. In this short talk, I will show that planetary rotation could be another factor for the longevity of primordial composition gradients. Using rotational mixing-length theory and 3D hydrodynamic simulations, I will demonstrate that rotation significantly reduces both the convective velocity and the mixing of primordial composition gradients.

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