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SUMMARY:Between quasigeostrophic and stratified turbulence - Bartello\, P 
 (McGill University)
DTSTART:20131202T140000Z
DTEND:20131202T144500Z
UID:TALK49129@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:While it is well-established that the frequency disparity betw
 een vortical and wave motion is key to understanding the quasigeostrophic 
 limit\, i.e. strong rotation and stratification\, the starting point for t
 his contribution is that it has recently been established that there is no
  such frequency disparity in stratified turbulence without rotation. It re
 mains to ask what happens in between these two limits\, long held as the p
 revailing dynamics between deformation-scale eddies and the microscale whe
 re isotropy is recovered. To do this\, ideas from numerical weather predic
 tion were borrowed in order to explore numerically the nonhydrostatic Bous
 sinesq equations starting from initial conditions that are close to our cu
 rrent fuzzy notions of balance for a variety of Rossby and Froude numbers.
  It is found that evolution is immediately away from this balance in the s
 mall scales\, and from steep to much more shallow spectra. It will be argu
 ed that this conclusion is robust to unce rtainties in the definition of b
 alance.\n
LOCATION:Seminar Room 1\, Newton Institute
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