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SUMMARY:Energy cascades in the baroclinic ocean wind-driven double gyre pr
 oblem - Straub\, D (McGill University)
DTSTART:20131202T160000Z
DTEND:20131202T164500Z
UID:TALK49128@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-author: David Straub\n\nWe consider the classic baroclinic 
 quasigeostrophic wind-driven ocean double gyre problem over a range of def
 ormation radii\, wind stress amplitudes\, and bottom friction coefficients
  with an aim of understanding transfer of energy across scales. In this be
 ta-plane basin setting\, we find significant differences from classic stud
 ies of gestrophic turbulence\, which generally assume zonal periodicity. I
 n a basin geometry\, the beta term (related to a latitudinal dependence in
  the Corioils parameter) can play a key role. For example\, it can be the 
 dominant term allowing for energy transfer between the basin scale and the
  baroclinic mesoscale. We also find that barotropization of baroclinic mes
 oscale energy forces the barotropic mode at scales where the barotropic mo
 de is most energetic. Related to this\, the barotropic nonlinear inverse e
 nergy cascade does not extend between mesoscale injection and large scale 
 dissipation wavenumbers\, as is often assumed. Instead\, it is part of a `
 `double cascade" of barotropic energy in which the nonlinear inverse casca
 de is nearly offset by a forward cascade associated with the beta term. Th
 is is particularly evident in weak bottom drag simulations\, for which a t
 ime eddy-mean flow decomposition reveals the double cascade to beassociate
 d with the eddy-only terms. \n\n
LOCATION:Seminar Room 1\, Newton Institute
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