Large-scale periodic strong currents off the eastern coast of the Noto Peninsula observed in autumn 2004

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  • 能登半島東岸で2004年秋季に観測された大規模強流反復現象
  • ノト ハントウ トウガン デ 2004ネン シュウキ ニ カンソク サレタ ダイキボ キョウリュウ ハンプク ゲンショウ

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<p>Three typhoons successively passed the Noto Peninsula over a period of approximately one month in autumn 2004, and the strong currents produced by the typhoons periodically attacked the eastern coast of the peninsula. The current records for 10 days following the passage of Typhoon 0418 showed notable periodic variations with amplitudes exceeding 50 cm s-1 and periods of 19.0-19.5 hours. The periodic current variations were observed to propagate from the north to the south along the eastern coast of the peninsula. The southward (northward) currents were accompanied by an increase (decrease) in the subsurface temperature and by sea level anomalies at the observation sites. All of the predominant periods of current, temperature, and sea level variations approximated the inertial periods at the observation sites, and the current vectors completed one clockwise rotation during one period. This study shows that the periodic current variations in the vicinity of the northern part of the peninsula are caused by the propagation of coastal trapped waves derived from near-inertial internal waves in the offshore area, whereas those in the vicinity of the southern part of the peninsula are caused by the direct incident of diffracted waves from Toyama Bay. The large-scale nearinertial motions with large amplitudes can be attributed to the superposition of near-inertial waves caused by each of the successive three typhoons.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 24 (4), 133-146, 2015-07-15

    The Oceanographic Society of Japan

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