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SUMMARY:Turbulent zonal jets: self-organization and wave-mean flow interac
 tions - Dr Daphné Lemasquerier\, University of St Andrews
DTSTART:20250314T160000Z
DTEND:20250314T170000Z
UID:TALK227203@talks.cam.ac.uk
CONTACT:Professor Grae Worster
DESCRIPTION:The colourful bands of Jupiter are sustained by intense east-w
 est winds called zonal jets\, which extend well below Jupiter's weather la
 yer into its mantle of liquid hydrogen. These jets constitute a fascinatin
 g natural example of how a rapidly-rotating turbulent flow self-organises 
 at large scale. Despite decades of observations and modelling\, understand
 ing the long-term\, nonlinear equilibration of zonal jets and the feedback
  with the underlying turbulence and waves is still a challenge. In this se
 minar\, I will discuss the dynamics of zonal jets from a wave-mean flow in
 teraction perspective\, using a combination of rapidly-rotating laboratory
  experiments\, numerical models and theoretical analyses. I will highlight
  the essential role of Rossby waves in the emergence and nonlinear saturat
 ion of turbulent jets\, as demonstrated experimentally and theoretically w
 ith a simple quasi-linear model. Following a similar approach as in the Ho
 lton-Lindzen-Plumb model for mean flow reversals in stratified fluids\, I 
 will extend this quasi-linear analytical model to study jets' coarsening\,
  and discuss the final scale and amplitude of zonal winds when they are lo
 cally versus globally-driven. 
LOCATION:MR2
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