Abstract
JAMSTEC (Japan Marine Science and Technology Center) and APL (Applied Physics Laboratory, University of Washington) started a joint program to directly measure part of the circulation cell of the Central Equatorial Pacific Ocean using acoustic tomography. The tropical and subtropical Pacific Ocean are suggested to connect via a shallow meridional circulation cell by Gu and Philander (1997). This subtropical cell (STC) has been hypothesized to the El Nino-Southern Oscillation phenomena in the tropics, which then, in turn, can affect the subtropical ocean via rapid atmospheric forcing. But no direct measurements exist and indirect measurements and modeling support the hypothesis. The observational centerpiece is tomography systems located in the Central Equatorial Pacific Region. JAMSTEC began the field work by deploying five acoustic transceivers in the observational region and this work will continue until January 2001 (two-year plan). Measurement data were sent to JAMSTEC in realtime using satellite telemetry system. These data were analyzed and compared with CTD observations. The time series fluctuation of the temperature was solved by this analysis.
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