Sclerosponge as archive of pCO2 in the past oceans

• Project/Area Number: 17K17669
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis; Geochemistry/Cosmochemistry
• Research Institution: The University of Tokyo
• Principal Investigator: Kentaro Tanaka 東京大学, 大気海洋研究所, 特任研究員 (20792766)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 古環境 / 炭酸カルシウム / 海洋酸性化 / 硬骨海綿 / 二酸化炭素 / 石灰化生物 / 環境復元 / pH

Outline of Final Research Achievements

Sclerosponges produce calcareous skeletons. In this study, we examined whether the chemical composition of sclerosponge skeletons (boron concentration and isotope ratios) reflects seawater pH and carbonate ion concentration. As a result, pH estimated from the boron isotope ratio was nearly consistent with seawater pH, suggesting that sclerosponge can be utilized as a new archive of seawater pH. However, the carbonate ion concentration estimated by boron concentration and isotope ratios was higher than seawater value, indicating that it is difficult to estimate carbonate ion concentration based on sclerosponges.

Academic Significance and Societal Importance of the Research Achievements

本研究では硬骨海綿のホウ素同位体比が海水pHの指標となりうることを示した．これまでもサンゴの骨格や有孔虫に記録された化学組成を利用して海水のpHを推定する研究が行われてきた．しかし，サンゴ骨格の化学組成から推定されるpHは海水のｐHより高く，有孔虫を使った研究が行われた海域は限られている．今回の成果によってこれまでより広い海域と年代のpHをより正確に推定できる可能性を提示できた．本研究の成果をもとに全球規模での大気―海洋間の二酸化炭素の収支をより正確に明らかにする試みが促進されると期待できる．

Research Products

• [Journal Article] Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes (2020)
  • Author(s): Snyder, G.T., Matsumoto, R., Suzuki, Y., Kouduka, M., Kakizaki, Y., Zhang, N., Tomaru,H., Sano, Y.,, Takahata, N., Tanaka, K., Bowden, S.A., Imajo, T.
  • Journal Title: Scientific Reports Volume: 10 Issue: 1 Pages: 1-13
  • DOI: 10.1038/s41598-020-58723-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Geochemical constraints on the depositional environment of the 1.84 Ga Embury Lake Formation, Flin Flon Belt, Canada (2020)
  • Author(s): Motomura Kento、Kiyokawa Shoichi、Ikehara Minoru、Tanaka Kentaro、Sano Yuji
  • Journal Title: Island Arc Volume: 29 Issue: 1 Pages: 1-23
  • DOI: 10.1111/iar.12343
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A review of transgenerational effects of ocean acidification on marine bivalves and their implications for sclerochronology (2020)
  • Author(s): Zhao Liqiang、Shirai Kotaro、Tanaka Kentaro、Milano Stefania、Higuchi Tomihiko、Murakami-Sugihara Naoko、Walliser Eric O.、Yang Feng、Deng Yuewen、Sch?ne Bernd R.
  • Journal Title: Estuarine, Coastal and Shelf Science Volume: 235 Pages: 106620-106620
  • DOI: 10.1016/j.ecss.2020.106620
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Trace elemental alterations of bivalve shells following transgenerational exposure to ocean acidification: Implications for geographical traceability and environmental reconstruction (2020)
  • Author(s): Liqiang Zhao, Stefania Milano, Kentaro Tanaka, Jian Liang, Yuewen Deng, Feng Yang, Eric O. Walliser, Bernd R. Schone
  • Journal Title: Science of Total Environments Volume: 705 Pages: 135501-135501
  • DOI: 10.1016/j.scitotenv.2019.135501
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Structural-morphological and sedimentary features of forearc slope off Miyagi, NE Japan: implications for development of forearc basins and plumbing systems (2020)
  • Author(s): Chang, Jih-Hsin, Park, Jin-Oh, Chen, Tzu-Ting, Yamaguchi, Asuka, Tsuru, Tetsuro, Sano, Yuji, Hsu, Ho-Han, Shirai, Kotaro, Kagoshima, Takanori, Tanaka, Kentaro, Tamura, Chiori
  • Journal Title: Geo-Marine Letters Volume: - Issue: 3 Pages: 309-324
  • DOI: 10.1007/s00367-020-00636-w
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] New insight into light-enhanced calcification in mytilid mussels, Mytilus sp., infected with photosynthetic algae Coccomyxa sp.: δ13C value and metabolic carbon record in shells (2019)
  • Author(s): Zhao Liqiang、Zuykov Michael、Tanaka Kentaro、Shirai Kotaro、Anderson Julia、McKindsey Christopher W.、Deng Yuewen、Spiers Graeme、Schindler Michael
  • Journal Title: Journal of Experimental Marine Biology and Ecology Volume: 520 Pages: 151211-151211
  • DOI: 10.1016/j.jembe.2019.151211
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Determination of the geographical origin of marine mussels (Mytilus spp.) using 143Nd/144Nd ratios (2019)
  • Author(s): Zhao Liqiang、Tanaka Kentaro、Tazoe Hirofumi、Iizuka Tsuyoshi、Kubota Kaoru、Murakami-Sugihara Naoko、Shirai Kotaro
  • Journal Title: Marine Environmental Research Volume: 148 Pages: 12-18
  • DOI: 10.1016/j.marenvres.2019.05.002
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Microscale magnesium distribution in shell of the Mediterranean mussel Mytilus galloprovincialis: An example of multiple factors controlling Mg/Ca in biogenic calcite (2019)
  • Author(s): KentaroTanaka, Nobuyuki Okaniwa, Tsuzumi Miyaji, Naoko Murakami-Sugihara, Liqiang Zhao, Kazushige Tanabe, Bernd R. Schone, Kotaro Shirai
  • Journal Title: Chemical Geology Volume: 511 Pages: 521-532
  • DOI: 10.1016/j.chemgeo.2018.10.025
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Sea surface pH over the last 7 kyr reconstructed by boron isotope ratio of sclerosponges (2019)
  • Author(s): K. TANAKA, K. SHIRAI, A. KITAMURA, R. SHINJO
  • Organizer: Goldschmidt2019
  • Int'l Joint Research
• [Presentation] 硬骨海綿を使った過去の海水pHの推定 (2019)
  • Author(s): 田中健太郎，白井厚太朗，北村晃寿，上野大輔 ，矢島健，佐々木猛智，新城竜一
  • Organizer: 日本サンゴ礁学会第22回大会
• [Book] Coral Reef Studies of Japan Chapter 6 Frontiers of Coral-Based Sclerochronological Studies in Japan (2018)
  • Author(s): Kohki Sowa and Kentaro Tanaka
  • Total Pages: 179
  • Publisher: Springer