研究題目二枚貝の殻の重金属分析から津波による海洋汚染履歴をさぐる

調査地大槌湾

テーマ番号（各班の番号）4

研究実施者（氏名・所属）杉原奈央子・白井厚太朗・堀真子・佐野有司（東京大学大気海洋研究所）

キーワードムラサキイガイ、重金属、汚染物質、元素分析、成長線解析

研究内容（目的・方法）
津波に伴う湾内の堆積物の巻き上がりや陸源物質の湾内への流入に由来する汚染物質の沿岸海洋環境中への負荷が懸念されます。しかし災害発生直後に観測を行い、汚染物質の挙動を調べることは困難です。本研究では、ムラサキイガイの貝殻に記録されているマンガンやバリウムなどの重金属濃度の変動を調べることで、大槌湾の汚染状況の復元を試みています。

参考文献

• Kubota K., Shirai K., Murakami-Sugihara N., Seike K., Minami M., Nakamura T., Tanabe K. (inpress) Bomb-14C Peak in the North Pacific Recorded in Long-lived Bivalve Shells(Mercenaria stimpsoni). Journal of Geophysical Research-Ocean.
• Shirai K., Kubota K., Murakami-Sugihara N., Seike K., Hakozaki M., Tanabe K. (2018) Stimpson's hard clam Mercenaria stimpsoni, a multi-decadal climate recorder for the northwest Pacific coast. Marine Environmental Research, 133, 49-56.
• Seike K., Shirai K., Murakami-Sugihara N. (2017) Using tsunami deposits to determine the maximum depth of benthic burrowing. PLOS ONE. 12 (8) e0182753,
• Kubota K., Shirai K., Higuchi T., Miyajima T. (in press) Oxygen and hydrogen isotope characteristics of seawater in Otsuchi Bay and meteoric water of inflowing rivers. Coastal Marine Science
• Mashio, A. S., H.Obata, and T. Gamo (2017). Dissolved platinum concentrations in coastal seawater: Boso to Sanriku, Japan. Archives of Environmental Contamination and Toxicology, 73(2), 240-246.
• 小川浩史・穴澤活郎・小畑元・白井厚太朗・杉原奈央子・高田秀重・真塩麻彩実・水川薫子・南秀樹(2017)大槌湾における陸域由来環境汚染物質の分布と変動, 日本水産学会誌, 83, 648-651
• Fichot, C. G., R. Benner, K. Kaiser, Y. Shen, R. M. W. Amon, H. Ogawa, C-J. Lu (2016): Predicting dissolved lignin phenol concentrations in the coastal ocean from chromophoric dissolved organic matter (CDOM) absorption coefficients. Frontiers Marine Science,3:7. doi: 10.3389/fmars.2016.00007
• Lu, C-J., R. Benner, C. G. Fichot, H. Fukuda, Y. Yamashita, H. Ogawa (2016): Sources and transformations of dissolved lignin phenols and chromophoric dissolved organic matter in Otsuchi Bay, Japan. Frontiers Marine Science, 3:85. doi:10.3389/fmars.2016.00085
• Mashio, A. S., H. Obata, H. Tazoe, M. Tsutsumi,A. Ferrer i Santos, and T. Gamo (2016): Dissolved platinum in river water and seawater around Tokyo Bay and Otsuchi Bay in Japan. Estuarine, Coastal and Shelf Science, 180, 160-167.
• Kubota, K., Shirai, K., Murakami-Sugihara,N., Seike, K., Hori, M., A Tanabe, K. (2017): Annual shell growth pattern of the Stimpson’s hard clam Mercenaria stimpsoni as revealed by sclerochronological and oxygen stable isotope measurements. Palaeogeography, Palaeoclimatology, Palaeoecology, 465, 307–315.
• Mizukawa, K., Hirai Y., Sakakibara H., Endo S., Takada, H.,Sugihara-Murakami N., Shirai K. and Ogawa H. (2017): Spatial distribution and temporal trend of anthropogenic organic compounds derived from the 2011 East Japan Earthquake. Archives of Environmental Contamination and Toxicology, in press