[A-OS24] Exploring new frontiers of oceanic mixing research in the next decade

[AOS24-03] CTD・グライダ・フロート等に取り付けた高速水温計を用いた効率的自動微細構造観測手法の開発

*安田 一郎¹、李 根淙¹、長澤 真樹¹、ザイ ソウ¹、佐々木 雄亮¹、柳本 大吾¹、藤尾 伸三¹、田中 衛¹、後藤 恭敬²、中野 俊也²、笹野 大輔²、田中 雄大⁴、纐纈 慎也³ (1.東京大学大気海洋研究所、2.気象庁、3.海洋研究開発機構、4.水産研究教育機構東北区水産研究所)

キーワード：乱流、観測

A new efficient microstructure measurement with fast-response thermistors attached to CTD, underwater glider and deep float has been elaborated. The CTD-attached thermistor measurements were confirmed to be valid in the weak turbulent energy dissipation down to 10^-11W/kg by comparing with the one by free-fall instrument with the best accuracy, and revealed cross-Pacific top-bottom turbulence distribution. Vertical distribution of turbulent energy dissipationis found to be proportional withlocal squared buoyancy frequency N²(representing density vertical gradient) and local internal tide energy generation and dissipation, indicating that energy dissipation of tide-induced turbulence occurs in the main thermocline. Thermistor measurements attached to gliders and deep floats were also confirmed to be useful to measure weak turbulence area as in the deep water as well as the water where double-diffusive convections work. These contribute to revising models of tide-induced three-dimensional distribution used in ocean/climate models, which will contribute to reproducing ocean meridional overturning circulation and oceanic heat/material circulation.