Current Measurements of the Japan Sea Proper Water and the Intermediate Water by ALACE Floats |
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| Authors: | Daigo Yanagimoto Keisuke Taira |
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| Institution: | (1) Ocean Research Institute, University of Tokyo, Minamidai, Nakano-ku, Tokyo 164-8639, Japan;(2) Japan Society for the Promotion of Science, Ichibancho, Chiyoda-ku, Tokyo 102-8471, Japan |
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| Abstract: | The subsurface current of the Japan Sea was observed by two Autonomous Lagrangian Circulation Explorer (ALACE) floats. One
float, having a 20-day cycle, was deployed on 29 July 1995 in the eastern Japan Basin and drifted in the northeastern part
of the basin until 15 September 2000. The other float, with a 10-day cycle, was deployed on 4 August 1995 in the western Japan
Basin and drifted in the western Japan Basin, in the Yamato Basin and around the Yamato Rise until it reached its life limit
in mid-May 2000. An anticlockwise circulation in the eastern Japan Basin was observed and it was assumed to be in the upper
portion of the Japan Sea Proper Water (UJSPW) or in the intermediate water. The spatial scale of the circulation increased
as the depth decreased. A clockwise circulation was observed around the Yamato Rise in the UJSPW. Smaller clockwise and anticlockwise
rotations were observed in the western Japan Sea, where a seasonal variation was seen in drift speed with different phase
by depth. The correlation coefficient between drift speeds of two floats indicated little coherence among the subsurface circulation
between the east and the west of the Japan Basin, or between the north and the south of the subpolar front.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | ALACE float Japan Sea current measurement intermediate circulation |
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