Deepen the nitrogen cycle in the paleoceanography
Project/Area Number |
16H02236
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Stratigraphy/Paleontology
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Research Institution | Japan Agency for Marine-Earth Science and Technology |
Principal Investigator |
OHKOUCHI Naohiko 国立研究開発法人海洋研究開発機構, 生物地球化学研究分野, 分野長 (00281832)
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Co-Investigator(Kenkyū-buntansha) |
吉川 知里 国立研究開発法人海洋研究開発機構, 生物地球化学研究分野, 技術研究員 (40435839)
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Research Collaborator |
CHIKAMOTO Megumi
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Project Period (FY) |
2016-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥41,470,000 (Direct Cost: ¥31,900,000、Indirect Cost: ¥9,570,000)
Fiscal Year 2018: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
Fiscal Year 2017: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
Fiscal Year 2016: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
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Keywords | 窒素サイクル / 窒素 / 同位体比 / 窒素同位体比 / 生物地球化学 / 古海洋 |
Outline of Final Research Achievements |
We have determined the nitrogen isotopic composition of chlorophyll a in the water column and shallow sediments and discussed its controlling factor. We also measured nitrogen isotopic composition of (geo)porphyrins, geological derivatives of chlorophylls in the deep sea sediments and sedimentary rocks formed in ancient time. With these information, we carefully evaluated and confirmed that the nitrogen isotopic composition of chlorophyll is long preserved in the porphyrins conservatively. With this isotopic information, we can reconstruct the nitrogen cycle in the surface water of the geological past.
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Academic Significance and Societal Importance of the Research Achievements |
海洋の生物生産,つまりバイオマスを決めているのは主に海洋表層における窒素サイクルである。本研究は,その窒素サイクルの過去の変遷を明らかにするために,クロロフィルの窒素同位体比が利用できることを明らかにした。またクロロフィルが堆積物中で変質して生成されるポルフィリンの窒素同位体比が,クロロフィルのそれをそのまま保持していることを明らかにした。窒素サイクルは炭素サイクルを駆動するエンジンでもあるため,過去の表層窒素サイクルは,過去の気候変動を復元するうえで必須の情報となる。海洋の生物資源量を考えるうえでも重要な情報となるであろう。
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Report
(4 results)
Research Products
(23 results)
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[Journal Article] 1.1 billion years old porphyrins and their isotopic composition establish a marine ecosystem dominated by bacterial primary producers.2018
Author(s)
Gueneli, N., McKenna, A. M., Ohkouchi, N., Boreham, C., Beghin, J., Javaux, E. J., and Brocks, J. J.
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Journal Title
Proceedings of the National Academy of Science, USA
Volume: 115
Issue: 30
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Biological and physical modification of carbonate system parameters along the salinity gradient in shallow hypersaline solar salterns in Trapani, Italy2017
Author(s)
Isaji Y., H. Kawahata, J. Kuroda, T. Yoshimura, N. O. Ogawa, A. Suzuki, T. Shibuya, F. J. Jimenez-Espejo, S. Lugli, A. Santulli, V. Manzi, M. Roveri, and N. Ohkouchi
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Journal Title
Geochimica et Cosmochimica Acta
Volume: 印刷中
Pages: 354-367
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Widespread collapse of the Ross Ice Shelf during the late Holocene.2016
Author(s)
Yokoyama, Y., Anderson, J. B., Yamane, M., Simikins, L. M., Miyairi, Y., Yamazaki, T., Koizumi, M., Suga, H., Kusahara, K., Prothro, L., Hasumi, H., Southon, J. R., and Ohkouchi, N.
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Journal Title
Proceedings of National Academy of Science, USA
Volume: 113
Issue: 9
Pages: 2354-2359
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Multi-element, compound-specific isotope analysis of chloropigments: Insights into the biogeochemical cycle of the microbial mat in the shallow hypersaline environment2017
Author(s)
Isaji, Y., Kawahata, H., Kuroda, J., Yoshimura, T., Ogawa, N.O., Araoka, D., Makabe, A., Suzuki, A., Shibuya, T., Jimenez-Espejo, F.J., Takano, Y., Lugli, S., Santulli, A., Manzi, V., Roveri, M., Ohkouchi, N
Organizer
JpGU-AGU Joint Meeting 2017
Related Report
Int'l Joint Research
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