Characteristics of the <i>Kyucho</i> observed off the eastern coast of the Boso Peninsula

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  • 房総半島東岸沖で観測された急潮の特徴
  • ボウソウ ハントウ トウガンオキ デ カンソク サレタ キュウチョウ ノ トクチョウ

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Abstract

<p>To comprehend the characteristics of an intermittent strong current, “Kyucho”, off the east coast of Boso Peninsula, current and temperature measurements at the depth of 10 and 35 m were conducted for one year from March 2010 at a mooring station (water depth: 60 m) off Wada. Alongshore northeast-southwest flow prevailed throughout the year and strong currents which have large velocities exceeding 50 cm/s, which are defined as Kyucho in the present study, were recorded nine times. Except for one case, the strong current exhibits a southwestward flow, which is opposite to the Kuroshio flowing eastward in the offshore region. It was found that there were three cases that strong currents were related to coastal trapped waves induced by strong wind variations. In this regard, one of the three cases should be also superposed with amplified internal tidal currents with a semidiurnal period. In regard to the rest cases, it was found that the currents occurring with suddenly-amplified near-inertial oscillations, the currents occurring when the Kuroshio axis approaches to the coast, and the currents exhibit strong southwestward flow occurring together with continuous southerly wind and propagation of the coastal upwelling region. Unfortunately, we could not specify all the mechanisms of occurrences of these strong currents and the variations of current quantitatively, this study describes individual features of Kyucho observed off the Eastern Coast of the Boso Peninsula for the first time.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 23 (3), 73-86, 2014-05-15

    The Oceanographic Society of Japan

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