[A-OS09] 海洋混合学：物質循環・気候・生態系の維持と長周期変動の解明

[AOS09-16] Mixing Processes in the Kuroshio region and their influence on the low-trophic ecosystem

★Invited Papers

*郭 新宇¹、松野 健²、千手 智晴²、市川 香²、遠藤 貴洋²、堤 英輔²、仁科 文子³、中村 啓彦³、張 勁⁴、長谷川 大介⁵、吉江 直樹¹、小針 統³ (1.愛媛大学沿岸環境科学研究センター、2.九州大学応用力学研究所、3.鹿児島大学水産学部、4.富山大学理工学研究部、5.東北区水産研究所)

キーワード：黒潮、鉛直混合、低次生態系

In order to understand the vertical mixing processes in the Kuroshio, we carried out field observations in the Luzon Strait, east of Taiwan, outer shelf region of the East China Sea, and Tokara Strait in the past several years. The strong vertical mixing mainly due to interaction between the Kuroshio and seamounts were found in the areas east of Taiwan and Tokara Strait, while that mainly due to internal tides was found in the Luzon Strait and outer shelf region of the East China Sea. The nitrate flux associated with the strong vertical mixing in the Kuroshio was estimated using simultaneously measured nitrate concentration and vertical eddy diffusivity coefficient. The influences of vertically supplied nitrate on the phytoplankton and zooplankton were examined by field observations and laboratory experiments. In addition to the vertical mixing, the supply of nutrients from coastal waters was also observed and that due to horizontal and vertical advections were also diagnosed from results of a numerical model for a purpose of fully understanding on the nutrient dynamics along the Kuroshio.