Horizontal dispersion of near-inertial oscillations in a turbulent mesoscale eddy field

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ID: 302296
2001
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Abstract
We study the dispersion of wind-induced near-inertial oscillations (NIOs) in a fully turbulent baroclinic mesoscale eddy eld characterized by a continuous wavenumber spectrum.The in uence of the eddy eld on the horizontal dispersion of the different NIO modes is analyzed using a vertical normal mode expansion.Previous studies have identi ed two dispersion regimes: trapping and strong dispersion.We examine the modes in physical and spectral space to assess which regime prevails.Numerical and analytical results show the prevalence of a trapping regime.For each NIO mode, there exists a critical horizontal wavenumber, k c , that separates large-scale NIO structures, where trapping dominates, from the much less energetic small-scale NIO structures, where strong dispersion dominates.The maximum ef ciency of dispersion for scales close to k c concentrates NIO kinetic energy at these scales.The wavenumber k c results from a balance between refraction and dispersion.This balance rst occurs at the highest wavenumber.Thereafter, k c , which has dimensional expression k c 2 5 p/( ftR m 2 ), decreases with time at a rate inversely proportional to the radius of deformation, R m , of the baroclinic NIO mode considered.As a consequence, at any given time, higher NIO baroclinic mode energy can mostly be found in small-scale negative vorticity structures, such as laments near sharp vorticity fronts, whereas lower NIO mode energy is concentrated within the core of mesoscale anticyclonic vortices.For large times, a saturation mechanism stops the time-evolution of k c at a value close to the peak of the kinetic energy spectrum of the QG ow eld.
Reference Key
openalex_W3209519559 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Patrice Klein, Stefan G. Llewellyn Smith
Journal journal of marine research
Year 2001
DOI
10.1357/002224001762674908
URL
https://doi.org/10.1357/002224001762674908
Keywords Keywords not found

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