Observed and model radial vorticity for the selected modes of Fig. 2. First, second, and rightmost columns: radial vorticity ζr = (∇ × u)r for the observations, the 2D model, and the 1D model, respectively. The remaining columns in the middle show meridional cuts of ζr, radial velocity ur, and the kinetic helicity hk = ⟨u ⋅ ζ⟩ for the 2D model.
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