09.05.2016: FB1-Seminar

11:00 h, Hörsaal, Düsternbrooker Weg 20

Abstract:
By now we know that the ocean and the atmosphere are filled with dynamics with typical scale smaller than the deformation radius. These dynamics, also known as submesoscale in the ocean and mesoscale for the atmosphere, take the form of frontal features, internal waves. etc and could be important for the lateral dispersion of properties (nutrients, pollutants and other tracers) as well as for the forward cascade of energy toward smaller scales, where dissipation occurs.
In this talk I will focus on the turbulence emerging at submesoscale when frontal features are included in the picture. Submesoscale dynamics are represented passing from the quasi-geostrophic approximation (or its cousin, the surface quasi-geostrophic approximation) to a surface semi-geostrophic approximation.
Implications for the asymmetry between cyclones and anticyclones as well as for vertical velocities will be discussed.

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