BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Simple models of helical baroclinic vortices - Kurgansky\, MV (A.M
 . Obukhov Institute of Atmospheric Physics\, Russian Academy of Sciences)
DTSTART:20120723T134500Z
DTEND:20120723T140500Z
UID:TALK39013@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Two distinct asymptotic solutions of inviscid Boussinesq equat
 ions for a steady helical baroclinic Rankine-like vortex with prescribed b
 uoyant forcing are considered and critically compared. In both cases the r
 elative distribution of the velocity components is the same across the vor
 tex at all altitudes (the similarity assumption). The first vortex solutio
 n demonstrates monotonic growth with height of the vortex core radius\, wh
 ich becomes infinite at a certain critical altitude\, and the correspondin
 g attenuation of the vertical vorticity. The second vortex solution schema
 tizes the vortex core as an inverted cone of small angular aperture. These
  idealized vortices are then embedded in a convectively unstable boundary 
 layer\; the resulting approximate vortex solutions have been applied to de
 termine the maximum rotational velocity in vortices. Both models predict e
 ssentially the same dependence of the model-inferred peak rotational veloc
 ity on the local swirl ratio (the ratio of the maximum swirl velocity to t
 he average vertical velocity in the main vortex updraft). The helicity bud
 get of the vortex flow is analyzed in detail\, where applicable.\n\n
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR