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| Titel |
Libration-driven flows in planetary cores and subsurface oceans |
| VerfasserIn |
Jérôme Noir, David Cebron, Michael Le Bars, Jonathan Aurnou |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048219
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| Zusammenfassung |
| Orbital dynamics that lead to forced longitudinal libration of celestial bodies also result in an
elliptically deformed equatorial core-mantle boundary. In the present study, we
investigate the effect of the topographic coupling on the flow in the liquid layers of a
librating planet through a coupled numerical-experimental approach. We report
the first evidence of libration-driven elliptical instability in a non-axisymmetric
container. It is shown that intermittent turbulence, characteristic of such instabilities, is
associated with an enhanced zonal flow. Outside of the resonant conditions, we
observe a zonal flow that is well explained by Ekman boundary layer non-linear
interactions and remains independent of the elliptical deformation of the container. |
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