The existence of resonant, baroclinic, equatorially—trapped inertiagravity waves (discovered by Nunsch and Gill (19761) is confirmed in the mid—Pacific by spectral analysis of long sea level’records. The energy of the low—mode inertia—gravity waves is found to decrease toward the meridional b0undaries. A simple spectral model, acknowledging the disper—sive characteristics of the equatorial waves, adequately reproduces the observed mid-Pacific sea level spectra in the 1-6 day band. Model spectra _gomputed at latitudes outside the equatorial waveguide of the gravest meri-dional modes suggest the presence of" inertial" peaks in several observed sea level spectra. Resonant, low-mode inertia-gravity waves may also exist in the Indian Ocean. Sea level fluctuations along the Pacific equator are found to have

Kelvin wave characteristics in the 35-80 day band, and, in particular, propagation from the western Pacific to the coast of South America is observed. The Kelvin waves are atmospherically-forced in the centralwestern Pacific and have a computed equivalent depth corresponding to the first—baroclinic mode.