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- W2018620061 abstract "Giant planets like Jupiter and Saturn feature strong zonal wind patterns on their surfaces. Although several different mechanisms that may drive these jets have been proposed over the last decades, the origin of the zonal winds is still unclear. Here, we explore the possibility that the interplay of planetary rotation with the compression and expansion of the convecting fluid can drive multiple deep zonal jets by a compressional Rhines-type mechanism, as originally proposed by Ingersoll and Pollard (1982). In a certain limit, this deep mechanism is shown to be mathematically analogous to the classical Rhines mechanism possibly operating at cloud level. Jets are predicted to occur on a compressional Rhines length $l_R = (2 Omega langle H_rho^{-1} rangle v_{jet}^{-1} )^{-1/2}$, where $Omega$ is the angular velocity, $langle H_rho^{-1} rangle$ is the mean inverse density scale height and $v_{jet}$ is the typical jet velocity. Two-dimensional numerical simulations using the anelastic approximation reveal that this mechanism robustly generates jets of the predicted width, and that it typically dominates the dynamics in systems deeper than $O(l_R)$. Potential vorticity staircases are observed to form spontaneously and are typically accompanied by unstably stratified buoyancy staircases. The mechanism only operates at large rotation rates, exceeding those typically reached in three-dimensional simulations of deep convection in spherical shells. Applied to Jupiter and Saturn, the compressional Rhines scaling reasonably fits the available observations. Interestingly, even weak vertical density variations such as those in the Earth core can give rise to a large number of jets, leading to fundamentally different flow structures than predicted by the Boussinesq models typically used in this context." @default.
- W2018620061 created "2016-06-24" @default.
- W2018620061 creator A5011299807 @default.
- W2018620061 creator A5059835423 @default.
- W2018620061 date "2014-07-01" @default.
- W2018620061 modified "2023-10-10" @default.
- W2018620061 title "The compressional beta effect: A source of zonal winds in planets?" @default.
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- W2018620061 doi "https://doi.org/10.1016/j.icarus.2014.04.019" @default.
- W2018620061 hasPublicationYear "2014" @default.
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