Velocity structures of the Kuroshio and coastal cyclonic eddies off Shikoku, Japan observed by moored ADCPs

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  • 係留ADCPで観測された四国沖の黒潮と沿岸側低気圧性渦の流速構造
  • ケイリュウ ADCP デ カンソク サレタ シコクオキ ノ クロシオ ト エンガンガワ テイキアツセイウズ ノ リュウソク コウゾウ

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Abstract

The data of upward-looking ADCPs moored at two stations off Shikoku during 1993-1995 are analyzed to study velocity structures of the Kuroshio region. The ADCPs measured velocities of the strong current of the Kuroshio when the Kuroshio took the near-shore path and velocities of coastal cyclonic eddies when the Kuroshio took the offshore path. The vertical profile of velocity of the Kuroshio averaged over periods of the near-shore path shows following features: a strong current (over 100 cm/s) exists at depths shallower than 300 m; and there is a very strong vertical shear of velocity, reaching 1.0 × 10^-2 S^-1 ,from 300 to 400 m depths; and there is a weak countercurrent below 450 m depth. During periods of offshore path, the Kuroshio accompanied coastal cyclonic eddies. The average vertical profile of velocity of these eddies shows a southwestward current, reaching 20 cm/s, at the northern part of eddies with almost no vertical shear of velocity between 300 and 500 m depths.

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