Anticyclonic - Rotating in the opposite direction as the earth's rotation (clockwise in the Northern Hemisphere, anticlockwise in the Southern Hemisphere).
Baroclinic - A flow in which lines of constant pressure are not parallel with lines of constant density, in the context of lake dynamics this applies to all motion that is dependent on stratification.
Barotropic - A flow in which lines of constant pressure are parallel with lines of constant density, in the context of lake dynamics this assumption can be made when considering surface motion only.
Cyclonic - Rotating in the same direction as the Earth's rotation (anticlockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere).
Equivalent depth - Depth of homogeneous fluid where the long-wave barotropic phase speed c = y/gHe is equal to the long-wave baroclinic internal wave phase speed. As internal waves travel slower than surface waves, the equivalent depth is always smaller than the actual depth.
Gravity wave - Oscillatory motion where the restoring force is due to gravity.
Rectilinear motion - Movement in a straight line.
Vertical mode - Number of maxima in the vertical velocity structure for a particular wave.
Vorticity - The curl of the velocity field, or circulation ('spin') per unit area about a local vertical axis.
Vorticity wave - Oscillatory motion that results from the conservation of angular momentum in flow over varying topography.
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