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Geostrophic turbulence and active tracer transport in 2 dimensions
1315 March 2013
Program Organizers: Peter Constantin, Isaac Held and William Young
Many idealized models of atmospheric and oceanic flows reduce to the twodimensional (2D) advection of a tracer that in turn determines the flow field. The classic example is nondivergent 2D flow on a plane (or a sphere), where the tracer is the vertical (or radial) component of the vorticity. Of special interest is the "geostrophic trubulence" generated in systems with two interacting active tracers, representing flow at the tropopause and the earth’s surface in the simplest atmospheric case. Another example of special interest is surface quasigeostrophic (SQG) flow, in which the state of the system is completely determined by the temperature at the surface. SQG flows bear some formal resemblance to 3D incompressible flows – for example, dimensional arguments suggest a 5/3 kinetic energy spectrum for the direct turbulent cascade to small scales, just as in 3D. SQG has developed into a model problem for those interested in singularity formation in 3D Euler or NavierStokes. The possible formation of singularities in SQG remains unsolved. There is also interest in possible blowup of active scalar equations with more singular constitutive laws and in questions relating to long time behavior in the limit of small dissipative mechanisms. Our goal in this interdisciplinary workshop is to familiarize mathematicians and atmosphere/ocean scientists with ongoing research outside of their fields, and possibly fertilize new work within both groups.
There will be informal opportunities to discuss research, and some space for poster presentations will be available. Please limit the size of your poster to 3' x 4'.
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