[Eoas-seminar] Seminar by Joe LaCasce "Rossby waves over bathymetry" Monday February 24 at COAPS

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Seminar by Joe LaCasce "Rossby waves over bathymetry" Monday February 24 at COAPS

Abstract:   Topography plays a central role in ocean dynamics, but our intuition is nevertheless based largely on flat bottom models. This includes aspects like the baroclinic modes used for representing vertical structure and the character of baroclinic instability. A good example is Rossby waves, whose vertical structure and stability are both affected by bathymetry. Relatively modest topography causes the waves to be surface-trapped, which in turn alters their deformation radius and propagation speed. Rossby waves are also baroclinically unstable and this too is altered by bathymetry. If the topographic heights are large enough, energy is transferred directly to topographically-locked flows rather than to the most unstable wave found over a flat bottom. The resulting turbulent flow is also affected by bathymetry, with the deep flow slaved to topography and compensated surface eddies. The resulting flows strongly resemble those in the ocean interior, with westward propagation at the surface and deep gyres.



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Eric Chassignet
Professor and Director
Center for Ocean-Atmospheric Prediction Studies (COAPS)
Florida State University
2000 Levy Avenue, Building A, Suite 292
P.O. Box 3062741
Tallahassee, FL  32306-2741

Office : (1) 850-645-7288
COAPS  : (1) 850-644-3846
Cell   : (1) 850-524-0033 (urgent matters only)
FAX    : (1) 850-644-4841
E-mail : echassignet at fsu.edu
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