Variation of Underwater Noise in the Tomography Experiments at the Central Pacific
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概要
- 論文の詳細を見る
Tomography experiments using seven 200 Hz transceivers were conducted from January to December 2000 around the date line in the Central Pacific Ocean. The surface buoy for data communication of transceiver No. 6 was separated from the mooring system and began to drift on September 12, 2000. In this report, variation of underwater noise is investigated around that day. As a result, an increase of noise level more than 15 dB was found on September 11 in comparison to the stationary level. To investigate the reason for the extraordinary noise level, wind data by “QuikSCAT” of NASA were examined. Wind speed was approximately 10 m/s at the area and did not affect the noise level. As many line spectra were observed in the underwater noise and a steep slope was shown in the inclination data of the mooring on that day, separation of the buoy may have occurred by an artificial phenomenon.
- 2003-05-15
著者
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NAKANO Iwao
Japan Marine Science and Technology Center
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Nakamura Toshiaki
National Defense Acad. Kanagawa Jpn
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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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Fujimori Hidetoshi
Japan Marine Science and Technology Center, 2-15 Natsushima, Yokosuka 239-0061, Japan
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Nakano Iwao
Japan Marine Science and Technology Center, 2-15 Natsushima, Yokosuka 239-0061, Japan
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Nakamura Toshiaki
National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
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