Figure 5: Testing whether the wintertime submesoscale flow is quasi-geostrophic.

(a) Power spectra of transverse and longitudinal velocities at 50 m depth for the Oleander winter data. (b) Power spectra of transverse and longitudinal velocities at 20 m depth for the LatMix winter experiment. (c) Rossby number at 50 m depth for the Oleander winter data. (d) Rossby and Froude numbers at 20 m depth for the LatMix winter experiment. The light shadings are 95% confidence intervals.