Teague (1996): Evidence for a North Pacific Deep Western Boundary Current. Taira (2000): Deep current structure above the Izu-Ogasawara Trench. by Japan Hydrographic Association, Maruzen Publishing Co., Tokyo, 119 pp. The peak at 100 day period was common to the power spectra.Īnonymous (1992): Atlas of the Sea, ed. Power spectra of daily mean currents showed three spectral peaks at periods of 100 days, 28–32 days and 14–15 days. A westward mean flow prevailed at the stations, and no cyclonic circulation with mean flows of the opposite directions was observed in the Mariana Trench at a longitude of 142☃5′ E. The mean flow at 7009 m depth at the northern station was 0.7 cm s −1 to 240°T, and that at 6615 m depth at the southern station was 0.5 cm s −1 to 267°T. Two current meters were set at 6608 m and 7009 m at a station 24.9 km north of the center for 443 days from 31 July 1995 to 16 October 1996, and two current meters at 6214 m and 6615 m at a station 40.9 km south of the center for 441 days from 2 August 1995 to 16 October 1996. Although rotor revolutions in 60 minutes of recording interval were zero for 37.5% of the time, the maximum current at the deepest layer of 10890 m was 8.1 cm s −1, being composed of tidal currents, inertia motion and long period variations. Three current meters were set at 9687 m, 10489 m and 10890 m at the station in the center of the Challenger Deep for 442 days from 1 August 1995 to 16 October 1996. The bottom currents in the Challenger Deep, the deepest in the world, were measured with super-deep current meters moored at 11☂2′ N and 142☃5′ E, where the depth is 10915 m.
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