Left: amplitude of the meridional velocity fluctuations Fourier transform in the (kx-time) plane for model HighRes, spatially averaged over the region |y| < 5 × 107 m. Contours are for , , and . The region surrounding the maximum is filled in gray. Right: same as the left panel, but showing the time evolution of particular modes: kx = 5 (thick solid line), kx = 7 (dashed line,) and kx = 9 (dot-dashed line). The straight dashed line represents an exponential growth with a timescale of one day.
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