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SUMMARY:Turbulent fluid dynamics at the margins of rotational and stratifi
 ed control - McWilliams\, JC (UC\, Los Angeles)
DTSTART:20081209T093000Z
DTEND:20081209T100000Z
UID:TALK15605@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Geophysical fluid dynamicists have developed a mature perspect
 ive on the dynamical influence of Earth's rotation\, while most other area
 s of fluid dynamics can safely disregard rotation. Similarly\, geophysical
  problems usually arise under the influence of stable density stratificati
 on at least as importantly as velocity shear. In this talk the dominant tu
 rbulence and wave behaviors in the rotating and non-rotating\, stratified 
 and non-stratified fluid-dynamical realms are described\, and particular a
 ttention is given to their borderlands\, where rotational and stratified i
 nfluences are significant but not dominant. Contrary to the inverse energy
  cascade of geostrophic turbulence toward larger scales\, a forward energy
  cascade develops within the borderlands from the breakdown of diagnostic 
 force balances\, frontogenesis\, and frontal instabilities\, and then it c
 ontinues further through the small-scale\, non-rotating\, unstratified (a.
 k.a. universal) realm until it dissipates at the microscale. In particular
 \, this submesoscale cascade behavior is of interest as a global route to 
 kinetic and available-potential energy dissipations in the oceanic general
  circulation\, as well as an energy source for microscale material mixing 
 across stably-stratified density surfaces.
LOCATION:Seminar Room 1\, Newton Institute
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