Real-time acoustic monitoring of ocean interiors using ocean acoustic tomography

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Real-time acoustic monitoring of ocean interiors using ocean acoustic tomography

Nakano, Iwao / Fujimori, Hidetoshi / Nakamura, Toshiaki

Ocean acoustic tomography is a unique and powerful oceanographic tool that can give time series of 3-dimensional snapshots of ocean interiors in nearly real-time. JAMSTEC has realized such an ideal ocean acoustic tomography system combined with the Global Telecommunication Network (INMARSAT-C). A demonstration experiment was carried out in the western Pacific Basin in the summer of 1997. During this experiment, the time series of 3-D tomographic maps of temperature was successfully reconstructed every 6 h. These maps showed the energetic meander of the Kuroshio Extension with high time resolution. Another tomographic observation experiment was conducted in the central equatorial Pacific Ocean from 1999 to 2000. The preliminary result showed that the temperature and current fields changed strongly in relation to ENSO (La Nina). In the latter experiment, the processing time of measured data was greatly reduced, and a tomographic snapshot was reconstructed in nearly real-time. Our goal of monitoring the ocean interiors in real-time is almost accomplished.