On the angular structure of weakly non-linear large-scale motions in the ocean

The two-dimensional spectrum of large-scale motions in the upper layer of the south-eastern Atlantic has been estimated using surface buoy observations. The derived spectrum is compared with the theoretical spectra of weakly non-linear Rossby waves. In thein situ data-based spectrum, one can trace such characteristic peculiarities of the theoretically derived spectra as symmetry relative to the parallels and energy concentration in a nearly zonal flow.Translated by Vladimir A. Puchkin.