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Variability of Northeastward Current Southeast of Northern Ryukyu Islands
Authors:Hiroshi Ichikawa  Hirohiko Nakamura  Ayako Nishina  Masataka Higashi
Institution:(1) Faculty of Fisheries, Kagoshima University, Shimoarata, Kagoshima 890-0056, Japan;(2) Frontier Observational Research System for Global Change, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan;(3) Kagoshima University, Shimoarata, Kagoshima 890-0056, Japan
Abstract:To better understand the mechanism underlying the variation of the Kuroshio south of central Japan, we have examined the variability of current structure in its upstream region, southeast of Amami-Ohshima Island in the northern Ryukyu Islands. By combined use of ship-mounted Acoustic Doppler Current Profiler (ADCP) and the TOPEX/POSEIDON satellite altimeter data on Path 214, the sea surface absolute geostrophic currents were estimated every ten days from January 1998 to July 2002. The 4.5-year mean surface current was found to flow northeastward north of 26.8°N with a maximum speed of 14 cm s−1 over the shelf slope at 3000 m depth. The moored current-meter observations at three or four mooring stations from Dec. 1998 to Oct. 2002 suggested the existence of a northeastward undercurrent with a maximum core velocity of 23 cm s−1 at 600 m depth over the shelf slope at 1600 m depth. The mean volume transport in the top 1500 m between 27.9°N and 26.7°N is estimated to be 16 × 106 m3s−1 northeastward, including the subsurface core current related component of 4 × 106 m3s−1. This revised version was published online in July 2006 with corrections to the Cover Date.
Keywords:Kuroshio  Ryukyu  western boundary current  observation
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