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SUMMARY:Surface Quasi-Geostrophic turbulence - Nicolas Valade\, DAMTP/ Uni
 versité Côte d'Azur
DTSTART:20251028T130000Z
DTEND:20251028T140000Z
UID:TALK238957@talks.cam.ac.uk
CONTACT:Tal Agranov
DESCRIPTION:This presentation focuses on a model of temperature evolution 
 at the ocean surface known as surface quasi-geostrophy (SQG). The resultin
 g equations describe the two-dimensional transport of a scalar---the surfa
 ce temperature---by a velocity field that is itself generated by the spati
 al distribution of that scalar. As such\, the temperature in SQG is an act
 ive scalar and shares various mathematical\, and physical\, properties wit
 h the velocity in three-dimensional Navier–Stokes equations.  In particu
 lar\, it is well established that the kinetic energy cascades to smaller s
 cales in SQG. Beyond its relevance to geophysics\, the study of SQG flows 
 thus falls within a more fundamental context---the statistical study of hy
 drodynamical turbulence---and may offer a valuable testbed for refined the
 ories and statistical models.\n\nWe aim to substantiate\, or challenge\, t
 his analogy by studying various aspects of SQG turbulence in the regime do
 minated by the direct energy cascade. Our approach relies on the systemati
 c use of massively resolved direct numerical simulations\, and their stati
 stical analysis at both Eulerian and Lagrangian levels.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4.
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