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SUMMARY:Instabilities of internal gravity wave beams: insignts from experi
 mental and analytical approaches - Directeur Thierry Dauxois\, ENS Lyon
DTSTART:20170223T113000Z
DTEND:20170223T123000Z
UID:TALK69561@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Internal gravity waves play a primary role in geophysical flui
 ds:  they contribute significantly to mixing in the ocean and they redist
 ribute energy and momentum in the middle atmosphere. Until recently\, most
  of the studies were focused on plane-wave solutions. However\, these solu
 tions are not a satisfactory description of most geophysical manifestation
 s of internal gravity waves\, and it is now recognized that internal wave 
 beams with a locally confined profile are ubiquitous in the geophysical co
 ntext.\n \nWe will discuss the reason for their ubiquity in stratified fl
 uids\, since they are solutions of the nonlinear governing equations. More
 over\, in the light of the recent experimental and analytical studies of t
 hose internal gravity beams\, it is timely to discuss the two main mechani
 sms of instability for those beams: the triadic resonant instability and t
 he streaming instability.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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