Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS13] Ocean circulation and material cycle in coastal seas

Mon. May 27, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Kiyoshi Tanaka(University of Tokyo), Akihiko Morimoto(Ehime University), Yuichi Hayami(Saga University), Kazuhiko Ichimi(Seto Inland Sea Regional Research Center, Kagawa University)

[AOS13-P03] Hydrographic observations of estuarine circulation in Suruga Bay, Japan

*Kiyoshi Tanaka1, Masato Niki2, Kunio Kutsuwada2, Akio Ishida3, daisuke Takahashi2, Takaaki Katsumata2, Kazuyuki Uehara2 (1.University of Tokyo, 2.Tokai University, 3.Tokoha University)

Keywords:Suruga Bay, Sergia lucens, estuarine circulation, hydrographic observation

Sergestid shrimp (‘Sakura-ebi’ in Japanese), Sergia lucens, is an important marine product in Suruga Bay, south coast of Japan. Large-scale commercial catch of Sergia lucens is conducted only in Suruga Bay and around Taiwan. Although the reason abundant catch of Sergia lucens is limited to these areas has not yet been clarified thoroughly, two factors likely play important roles: One is a steep continental slope adjacent to a deep basin, and the other is large volume of river discharge. Therefore, we made a high-resolution hydrographic observation (shipboard ADCP and CTD) in the innermost region of Suruga Bay, where the mouth of the Fuji River is connected directly to the steep continental slope and an anticyclonic (clockwise) eddy tends to form. The observation suggested that an estuarine baroclinic circulation formed there. It is likely that a counter flow of subsurface water located around a depth of 20 m is entrained into the surface river plume at the river mouth.