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3D Acoustic Mapping Of The Kuroshio (Taiwan Current) Off The Southeast Coast Of Taiwan

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Annual rept.

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Ocean acoustic tomography OAT is a powerful tool that can estimate the structure of sound speed mainly proportional to temperature and current in the ocean Munk et al., 1995. Other than coastal sea studies e.g., Park and Kaneko, 2000, most previous experiments have been carried out in the open ocean, characterized with a full structure of the underwater sound channel Worcester, 1985 Cornuelle et al., 1985 Howe et al., 1987 Cornuelle et al., 1993 Dushaw et al., 1994 Send et al., 1995 Dushaw et al., 1995 Yuan et al., 1999. However its application to shallower regions with a sound speed profile SSP decreasing toward the bottom from the surface was limited because of the difficulty of ray resolvability DeFerrari and Nguyen, 1986. The same reason leads to its infrequent application to the western boundary current regions, located along the continental slopes. An OAT system, placed near the underwater sound channel axis where only its upper half is constructed, provides an efficient method to measure the full-depth profile of current in the Luzon Strait with the Kuroshio intrusion and strong internal tide activity, as demonstrated in the 2008 Luzon Strait experiment Taniguchi et al., 2010. In this study we apply the strategy employed by the 2008 Luzon Strait experiment to an analysis of acoustic tomographic data obtained in the Kuroshio southeast of Taiwan in 2009. The emphasis is on determining the time-dependent current profile above the sound channel axis that is near the bottom.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Numerical Mathematics
  • Acoustic Detection and Detectors

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