Ocean acoustic tomography (OAT) is a useful method for observing oceanographic phenomena over wide regions. A tomography experiment using seven 200 Hz transceivers was executed in the central equatorial Pacific Ocean from January to December 2000 to monitor ocean phenomena related to El Niño and southern oscillation (ENSO). Arrival times of the maximum amplitude of received signals were used to evaluate fluctuations through out the year. Tidal effects and semidiurnal currents were observed from the spectral analysis of arrival times through out the experimental period. From the comparison of reciprocal arrival time in several paths, reciprocal arrival time differences between transceiver no. 4 (T4) and no. 6 (T6) changed during mid-September to November. This change may be caused by ocean changes in the oceanic environment. Various changes through out an entire year could be detected using the sound propagation data at a depth of 1,000 m.
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