PERIODIC VARIATIONS OF THE TEMPERATURE AND WATER CURRENTS IN THE TONGUE OF THE OCEAN, BAHAMAS.
NAVAL RESEARCH LAB WASHINGTON D C
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A preliminary study was made of the cyclic variations of temperature and current direction at a fixed location in the Tongue of the Ocean, Bahamas, for a time period of 27 hours. An electronic thermometer and a novel current direction meter were developed for this project. The thermometer was essentially an RC phase-shift oscillator using thermistors as the sensitive element controlling the output frequency. To obtain current directions a similar oscillator was used incorporating a capacitor unit controlling the output frequency. A magnet oriented part of the capacitor with the earths field, and the capacitance varied when capacitor plates were rotated by the external vane. The current had a cyclic variation of about 180 degrees with a time period of about 9-12 minutes. The temperature had short-time fluctuations with about the same time period and had long-time fluctuations with a time period of about 2 hours. Longer time periods were also indicated. Of significance to the study of sound propagation is the finding that the phases of the periodic temperature fluctuations varried at different depths. Author