Inertial waves in spherical shells at low Ekman numbers |
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| Authors: | Ján ?imkanin Pavel Hejda Dana Jankovi?ová |
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| Institution: | 1.Institute of Geophysics,Acad. Sci. Czech Republic,Praha 4,Czech Republic;2.Institute of Atmospheric Physics,Acad. Sci. Czech Republic,Praha 4,Czech Republic |
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| Abstract: | Inertial waves as oscillatory motions in rotating fluids generate internal shear layers at critical latitudes. We investigated
the nonlinear interaction of inertial waves for global flows (3D flows) in dependence on the Ekman number. When the value
of the Ekman number decreases, the influence of the Ekman layers to the flow pattern increases. Critical latitudes, the attractor
flow pattern and certainly internal shear layers are observable mainly at greater values of the Ekman number. Although, with
decreasing the Ekman number smaller flow structures become visible, nonlinear interactions in shear layers drive an axisymmetric
flow whose amplitude diverges at the limit of the vanishing Ekman number. We show that this conclusion is valid not only for
zonal wind driven by inertial modes but also for similarly driven global flows. |
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