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SUMMARY:Vortex splitting in the stratosphere by sub planetary-scale cyclog
 enesis in the troposphere\, and some other thoughts about the dynamics of 
 stratospheric sudden warmings - Professor Alan O'Neill\, Reading Universit
 y
DTSTART:20151130T141500Z
DTEND:20151130T151500Z
UID:TALK61274@talks.cam.ac.uk
CONTACT:Paul Griffiths
DESCRIPTION:One of the most rapid and dramatic dynamical events occurring 
 in the stratosphere is the splitting of the polar vortex\, a structure tha
 t dominates the mid winter circulation. When the vortex splits\, chemical 
 species\, such as ozone\, are transported over great distance from the equ
 ator to the pole and mixed together. The phenomenon has intrigued dynamica
 l meteorologists for some time\, and ideas have been put forward to explai
 n it\, typically involving the generation and upward propagation of so-cal
 led planetary waves from the troposphere. I propose something different: t
 hat sub-planetary scale cyclones - weather systems\, the effects of which 
 are normally confined to the troposphere - can in fact do the job under pa
 rticular conditions. I contrast the dynamical behaviour with other classes
  of so-called stratospheric sudden warmings\, and comment on matters of at
 mospheric predictability at the time of such events.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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