Normal modes and resonance in Ontario Lacus
a hydrocarbon lake of Titan
David Vincent (Université Catholique de Louvain)
Jonathan Lambrechts (Université Catholique de Louvain)
Özgur Karatekin (Royal Observatory of Belgium)
Tim Van Hoolst (Royal Observatory of Belgium)
Robert H. Tyler (University of Maryland)
Véronique Dehant (Royal Observatory of Belgium, Université Catholique de Louvain)
Eric Deleersnijder (Université Catholique de Louvain, TU Delft - Mathematical Physics)
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Abstract
The natural modes of Ontario Lacus surface oscillations, the largest lake in Titan’s southern hemisphere, are simulated and analyzed as they are potentially of broad interest in a variety of dynamical researches. We found that tidal forces are too low in frequency to excite the (barotropic) normal modes. Broadband wind forcing likely spans the resonant frequencies. High wind speed, which could be encountered under episodic phenomena such as storms, would be required to significantly excite the normal modes. While the slower baroclinic normal modes could more easily be resonantly forced by the low-frequency tidal forces, addressing this issue demands unavailable information about the lake stratification.