Long-range-traveling sound in the ocean includes information on ocean phenomena such as changes in temperature, tide, internal wave, and vortex as travel time differences or sound pressure attenuations. In this study, time series of travel time differences between two moorings for an ocean acoustic tomography experiment in the equatorial central Pacific Ocean promoted by JAMSTEC in 2000 were compared with the calculated elevation of sea level predicted from eight major tidal constituents using the tidal model GOTIC2. While diurnal and semidiurnal tidal effects were confirmed from the water temperature changes located near the sound sources, differences in the reciprocal travel time also fluctuated in accordance with the tidal effects. Although the precision of the moorings position detection and travel time tracking from the received signals need to be improved, this analysis is the first step to reveal the dynamics of energy circulation in the sea.
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