Instability of an idealized tidal mixing front: Symmetric instabilities and frictional effects

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ID: 301163
2013
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Abstract
Finite amplitude instability of an idealized tidal mixing front is considered for cases where there is an active symmetric instability during the early stages of evolution.This can happen either when the initial front is sharp, or when a bottom stress leads to a well-mixed bottom boundary layer under the front.In either case, there is an initial phase, several days long, of slantwise convection, after which a much more energetic and spatially distributed baroclinic or barotropic instability dominates.The presence of an initial symmetrically unstable phase has no obvious effect on the subsequent eddy evolution.Bottom friction does lead to a slower growth rate for baroclinic instabilities, a lower eddy kinetic energy level, and (through stratified spindown) a tendency for flows to be more nearly surface intensified.The surface intensification means that the evolving eddy field cannot proceed toward a barotropic state, and so the horizontal eddy scale is also constrained.Thus, the finite-amplitude inverse cascade is strongly affected by the presence of a bottom stress.Scalings are derived for the frictionally corrected eddy kinetic energy and lateral mixing coefficient.The results, in terms of frictional effects on eddy structure and energy, appear to be valid beyond just the tidal mixing frontal problem.
Reference Key
openalex_W2326165660 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors K. H. Brink, Deepak Cherian
Journal journal of marine research
Year 2013
DOI
10.1357/002224013812587582
URL
https://doi.org/10.1357/002224013812587582
Keywords Keywords not found

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