UPPER-OCEAN DYNAMICS AND WATER-EXCHANGE AT THE ENTRANCE OF A SEMI-ENCLOSE BAY UNDER STRATIFIED AND UNSTRATIFIED CONDITIONS

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  • 半閉鎖性海域湾口部における成層期および成層崩壊期の流動構造と海水交換について
  • ハンヘイサセイ カイイキ ワンコウブ ニ オケル セイソウキ オヨビ セイソウ ホウカイキ ノ リュウドウ コウゾウ ト カイスイ コウカン ニ ツイテ

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Abstract

 For rigorious description of upper ocean dynamics and resultant volume transport at the mouth of Tanabe Bay, Wakayama, Japan, a comprehensive field campaign was conducted from summer to fall of 2015. The vertical structure of transient dynamics in the surface boundary layer and consequent water exchange at the mouth are characterized by high-frequency variability peaked at around the semi-diurnal period as well as in the lower-frequency subtidal band centered at 3 day period, consistent with the previous modeling study. A spectral coherence analysis indicates that near-surface currents are mainly driven by wind stress peaked at the diurnal frequency, whereas subsurface currents fluctuate rather by semi-diurnal internal tides. The upper ocean cools down gradually, corresponding to seasonal transition from summer to fall condition. However, an abrupt cooling event is observed albeit in a calm local forcing condition where an offshore subtidal cold water intrusion induced remotely by the fluctuating Kuroshio path plays an essential role.

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