Mechanism of eddy separation from coastal currents

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2000
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Abstract
A series of multi-layer numerical experiments show that classical e nite amplitude instabilities in boundary currents are not sufficient to account for the pinched-off eddies observed in the ocean and in laboratory experiments. These instabilities (barotropic or baroclinic) are shown to lead to an entrainment of offshore e uid into the boundary currents. Eddy separation, on the other hand, requires an additional process, such as a larger scale of motion containing a downstream velocity convergence of e nite amplitude; this might be produced by long period e uctuations in the discharge from an upstream source region which controls the boundary current, or by topographic features. In our spatially idealized model, we numerically computed the temporal evolution of an assumed initial state consisting of a fast moving upstream region separated by a potential vorticity front from a slow moving downstream region. We verify long-wave theories which show that this initial state indeed leads to frontal steepening and to a blocking wave. This eventually produces large transverse velocities followed by complete detrainment of eddies without any entrainment into the residual boundary current.
Reference Key
openalex_W2045139142 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Melvin E. Stern, Eric P. Chassignet
Journal journal of marine research
Year 2000
DOI
10.1357/002224000321511160
URL
https://doi.org/10.1357/002224000321511160
Keywords Keywords not found

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