Abstract
The present theory of geophysical waves that either raise or lower the equatorial thermocline, based on the reduced‐gravity shallow‐water equations on theβ‐plane, ignores vertical variations of the flow. In particular, the vertical structure of the Equatorial Undercurrent is absent. As a remedy we propose a simple approach by modeling this geophysical process as a wave‐current interaction in thef‐plane approximation, the underlying current being of positive constant vorticity. The explicit dispersion relation allows us to conclude that, despite its simplicity, the proposed model captures to a reasonable extent essential features of equatorial waves.
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