SEASONAL VARIABILITY OF WATER EXCHANGE AT THE ENTRNCE OF A SEMI-ENCLOSE BAY AND ITS UNDERLYING MECHANISMS

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  • 半閉鎖性内湾における海水交換特性の季節変化とその形成メカニズムについて
  • ハンヘイサセイ ナイワン ニ オケル カイスイ コウカン トクセイ ノ キセツ ヘンカ ト ソノ ケイセイ メカニズム ニ ツイテ

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Abstract

 An extensive field campaign was carried out to examine water exchange at the entrance of the semi-enclosed Tanabe Bay, Wakayama, from September until December 2016 using the observing system of the Tanabe-Nakashima observatory and an ADCP. The first half of the observation period mostly under stratified condition is characterized by a gross outflow from the bay, while the second half under unstratified condition is dominated by inflow into the bay. Typhoon 201616 attacked the bay during the first half, which excited intensive instantaneous outflow. Although the semi-diurnal component prevails in the upper ocean velocity during both periods, the coherent analysis indicates that the external forcing such as wind and sea surface height is less correlated at this frequency. This suggests that baroclinic velocity profiles at depth would yield inversion of flow direction that cancels the vertically-integrated volume flux, which is viewed as a proxy of the water exchange. During the second half, the subtidal low-frequency component is responsible for the exchange, which may be caused by meridional shift of the Kuroshio path and associated mesoscale circulations formed in the Kii Channal that leads to multiple warming events.

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