Geochemical cycling in marine ecosystem using iron and neodymium isotope tracers
| Project/Area Number |
17H01857
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
長島 佳菜 国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), 研究員 (90426289)
藤木 徹一 国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), 主任研究員 (30598248)
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2020: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2017: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
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| Keywords | 同位体 / 鉄 / ネオジム / 海洋 |
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| Outline of Final Research Achievements |
In this study, we attempted to identify the origin and form of iron ingested by phytoplankton which is a primary producer in the ocean, using iron (Fe), strontium (Sr), and neodymium (Nd) isotopes as indicators. After establishing the analytical method for a small amount of settling particle sample, we investigated the annual and seasonal changes in the isotopic and chemical compositions of settling particles in the western subarctic North Pacific region, and obtained detailed data. Based on these results, we conducted a quantitative evaluation of the supply of iron-containing materials from the surrounding terrestrial regions to the western subarctic North Pacific region. The contribution of volcanic material was relatively large throughout the year, but the contribution of eolian dust from the Asian continent was also large in spring and autumn.
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| Academic Significance and Societal Importance of the Research Achievements |
海洋一次生産者である植物プランクトンが摂取する鉄の起源が明らかになれば、西部北太平洋亜寒帯域をはじめ様々な海域において、生物生産と陸域からの鉄供給との関係をより定量的に評価できるようになることが期待される。特に、溶存態鉄だけでなく、可溶性の粒子態鉄（鉄水酸化物）や難溶性の粒子態鉄（アルミノ珪酸塩）の関与が明らかになれば、海洋表層から深層に鉛直輸送される珪藻の生物ポンプの機能（海洋の元素分布の規定要因）の見直しや、氷期－間氷期サイクルにおける生物生産と海洋への鉄フラックスの関係の再検討など、海洋学、古環境学への波及効果が大きく、この点に本研究の重要な意義がある。
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Report
(5 results)
Research Products
(24 results)
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[Journal Article] Characteristics in trace elements compositions of tephras (B-Tm and To-a) for identification tools2021
Author(s)
Nara, F.W., Yokoyama, T., Yamazaki, S., Minami, M., Asahara, Y., Watanabe, T., Yamada, K., Tsuchiya, N., Yasuda, Y.
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Journal Title
Geochemical Journal
Volume: 55
Pages: in press
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Multi-approach characterization of shallow-water carbonates off Minamitorishima and their depositional settings/history2021
Author(s)
Aftabuzzaman, Md., Yomogida, K., Suzuki, S., Takayanagi, H., Ishigaki, A., Machida, S., Asahara, Y., Yamamoto, K., Hirano, N., Sano, S., Chiyonobu, S., Bassi, D., Iryu, Y.
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Journal Title
Island Arc
Volume: 30
Pages: e12400
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Integrated Neogene biochemostratigraphy at DSDP Site 296 on the Kyushu-Palau Ridge in the western North Pacific2020
Author(s)
Matsui, H., Horikawa, K., Chiyonobu, S., Itaki, T., Ikehara, M., Kawagata, S., Wakaki-Uchimura, H., Asahara, Y., Seki, O., Okazaki, Y.
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Journal Title
Newsletters on Stratigraphy
Volume: 53
Pages: 313-331
DOI
Related Report
Peer Reviewed
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[Journal Article] Detrital Sr-Nd isotopes, sediment provenance, and depositional processes in the Laxmi Basin of the Arabian Sea during the last 800 kyrs2020
Author(s)
Khim, B.K., Horikawa, K., Asahara, Y., Kim, J.E., Ikehara, M. Detrital Sr-Nd isotopes, sediment provenance, and depositional processes in the Laxmi Basin of the Arabian Sea during the last 800 kyrs
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Journal Title
Geological Magazine
Volume: 157
Pages: 895-907
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Litho-, bio-, and chemostratigraphy of the Middle Triassic carbonate succession in the North-Central Coast Region of Vietnam2019
Author(s)
Thuy Thi Nhu Ha, Takayanagi, H., Ueno, K., Asahara, Y., Yamamoto, K., Iryu, Y.
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Journal Title
Progress in Earth and Planetary Science
Volume: 6
Pages: 47
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] 87Sr/86Sr age determination by rapidly formed spherical carbonate concretion2019
Author(s)
Yoshida, H., Asahara, Y., Yamamoto, K., Katsuta, N., Minami, M., Metcalfe, R.
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Journal Title
Scientific Reports
Volume: 9
Pages: 1003
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Late Miocene-mid Pliocene tectonically-induced formation of the semi-closed Japan Sea, inferred from seawater Nd isotopes2018
Author(s)
Kozaka, Y., Horikawa, K., Asahara, Y., Amakawa, H., Okazaki, Y.
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Journal Title
Geology
Volume: 46
Pages: 903-906
DOI
Related Report
Peer Reviewed
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[Journal Article] Fe-oxide concretions formed by interacting carbonate and acidic waters on Earth and Mars2018
Author(s)
Yoshida, H., Hasegawa, H., Katsuta, N., Maruyama, I., Sirono, S., Minami, M., Asahara, Y., Nishimoto, S., Yamaguchi, Y., Ichinnorov, N., Metcalfe, R.
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Journal Title
Science Advances
Volume: 4
Pages: eaau0872
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Book] Orbital-Scale Paleoceanographic Response to the Indian Monsoon in the Laxmi Basin of the Eastern Arabian Sea2019
Author(s)
Khim, B.K., Kim, J.E., Horikawa, K., Ikehara, M., Asahara, Y., Lee, J.M.
Total Pages
188
Publisher
Springer, Cham
ISBN
978-3-030-01598-5
Related Report
