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SUMMARY:Is geostrophic turbulence relevant for tropospheric dynamics? - Va
 llis\, GK (Princeton)
DTSTART:20081211T093000Z
DTEND:20081211T100000Z
UID:TALK15618@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Geostrophic turbulence is a model for understanding the large-
 scale structure and flow of energy in stably-stratified\, rapidly rotating
  flows that\, typically\, are baroclinically unstable or driven externally
  by small-scale convection. Inverse energy cascades and the production of 
 zonality by the beta effect robust predictions for such flows. Is such a m
 odel relevant for the Earth's troposphere? On the one hand it appears that
  such a model must surely be relevant because of its generality\, but on t
 he other hand the inverse cascade is noticeable by its absence in the Eart
 h's atmosphere\, and zonal jets do not appear as well formed as those on s
 ome other planets. We will discuss these issues\, and compare some turbule
 nt simulations from a quasi-geostrophic model with those from a primitive-
 equation model in parameter settings including\, but not restricted to\, t
 he Earth's troposphere.\n\nJoint work with P. Zurita-Gotor.
LOCATION:Seminar Room 1\, Newton Institute
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