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In rotating stars and planets, excitation of inertial waves in convectiveenvelopes provides an important channel for tidal dissipation, but thedissipation rate due to inertial waves depends erratically on the tidalfrequency. Tidal dissipation is significantly enhanced at some frequencies,suggesting possible resonances between the tidal forcing and some eigenmodes.However, the nature of these resonances remains enigmatic owing to thesingularity of the eigenvalue problem of inertial waves, and the resonances areoften mistakenly attributed to wave attractors in the literature. In thisletter, we reveal that resonant tidal responses correspond to inertial modeswith large-scale flows hidden beneath localized wave beams. Strong couplingsbetween the tidal forcing and the hidden large-scale flows intensify thelocalized wave beams emanating from the critical latitudes, leading to enhancedtidal dissipation. This study resolves a long-standing puzzle regarding thefrequency-dependence of tidal dissipation due to inertial waves in convectiveenvelopes.

Resonant tidal responses in rotating fluid bodies: global modes hidden beneath localized wave beams