Development of hydrothermal-derived trace metals monitoring method in the ocean by using the in-situ auto analyzer

2015 Fiscal Year Final Research Report

• Project/Area Number: 24310006
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: The University of Tokyo
• Principal Investigator: Hajime Obata 東京大学, 大気海洋研究所, 准教授 (90334309)
• Co-Investigator(Kenkyū-buntansha): OKAMURA Kei 高知大学, 教育研究部総合科学系複合領域科学部門, 准教授 (70324697) ; MARUO Masahiro 滋賀県立大学, 環境科学部, 准教授 (80275156) ; GAMOS Toshitaka 東京大学, 大気海洋研究所, 教授 (70143550)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 熱水プルーム / 鉄 / 亜鉛 / 硫化物 / 有機配位子 / 現場型自動分析計

Outline of Final Research Achievements

We investigated distributions and biogeochemical cycles of trace metals in hydrothermal plumes that have strong influences on dissolved iron budget in the ocean. We first developed a correction method of Fe(II) measurements in hydrothermal plumes by using dissolved oxygen and sulfide concentrations in water samples. Using this correction method, we revealed the vertical Fe(II) distribution at the Juan de Fuca Ridge more accurately. On the other hand, zinc speciation in seawater was examined in the coastal hydrothermal area in Tachibana Bay in Nagasaki, Japan. The Zn distribution was seemingly regulated by existing sulfides and organic ligands in seawater. Moreover, we obtained a vertical Fe(II) distribution to a depth of 1500m in the South Pacific Ocean continuously with an in-situ auto analyzer.

Free Research Field

海洋地球化学