Statistics – Applications
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p31b1253t&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P31B-1253
Statistics
Applications
[6218] Planetary Sciences: Solar System Objects / Jovian Satellites, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites
Scientific paper
The organizing thesis of this presentation is the assertion that a better understanding of ocean tides and ocean tidal dissipation shall be central in improving our understanding of the present state and evolution of several of the icy satellites. In most studies so far, these satellite oceans have been treated, at least implicitly, as simply a heat-conducting lubricant. But for many applications this approach does not approximate realism and ocean models affording dynamical behavior are required. Specifically, we present and discuss the importance of including dynamical freedom in modeling the ocean tides. We review recent claims that ocean tidal flow velocities on Europa and other satellite oceans are much larger than previous assumed; and that the higher velocities arrive from dynamical resonance between obliquity tidal forcing and Rossby-Haurwitz waves. We shall then discuss the more general importance of ocean tides, including tides forced by eccentricity. Far from the equilibrium-tide ocean previously assumed, the dynamic ocean shows tides that can be resonantly excited, and this feature seems to be of inescapable importance in understanding the evolution of these satellites when the trajectories for such evolution are expected to cross resonant excitation peeks in ocean tidal energy. The dynamical tides show not only increased amplitudes, but also behavior that is much different than what is assumed. For example, the dominant tidal flow expected is non-divergent and will therefore not appear in altimetry records (contrary to what is being assumed). Perhaps most importantly, in models of flow dissipation, the amount of heat generated typically increases with the square or cube of the flow speed. So estimates of the amount of ocean tidal heat generated and the overall dissipation priority of the ocean (i.e. is tidal dissipation primarily oceanic---as is the case on earth?) depend sensitively on the description of the ocean flow.
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