Fluctuation of Long-Distance Sound Propagation in the Central Pacific
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概要
- 論文の詳細を見る
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.
- 2006-05-30
著者
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HACHIYA Hiroyuki
Research Center for Frontier Medical Engineering, Chiba University
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Mizutani Koichi
Graduate School Of Systems And Information Engineering Univ. Of Tsukuba
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Nakamura Toshiaki
Department Of Anesthesia Nagasaki Rosai Hospital
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Ogasawara Hanako
Department of Earth and Ocean Sciences, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
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Fujimori Hidetoshi
Japan Agency for Marine–Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
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Ogasawara Hanako
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
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Mizutani Koichi
Graduate School of System and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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