Precise determination of atmospheric pCO2 since Pliocene
| Project/Area Number |
18K18186
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
KUBOTA Kaoru 国立研究開発法人海洋研究開発機構, 超先鋭研究開発部門(高知コア研究所), 特別研究員(PD) (80774075)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Discontinued (Fiscal Year 2020)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | ホウ素同位体 / ホウ素 / 炭素循環 / 有孔虫 / 海底堆積物 / 質量分析 / 二酸化炭素 / サンゴ / 同位体 |
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| Outline of Final Research Achievements |
It was of great academic importance to establish for the first time in Japan analytical procedures for measurements of Mg/Ca ratio, oxygen isotope, and boron isotope from one planktonic foraminifera sample. We published a paper reporting the method and its application from the international journal Scientific Reports. In addition, though we faced various difficulties in developing the technology for reducing the amount of boron isotopes required for measurement of planktonic foraminifera, we identified multiple sources of boron contamination through conducting deliberate environmental monitoring. The results were also published from the international journal Chemical Geology. It was also very important that I stayed at the Alfred Wegener Polar Research Institute, which has advanced technology in the boron isotope measurement, for one month to learn the method.
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| Academic Significance and Societal Importance of the Research Achievements |
海洋表層に生息する浮遊性有孔虫の殻のホウ素同位体は過去の大気の二酸化炭素濃度を記録する。二酸化炭素は温室効果ガスとして地球の気候変動を支配する要因の一つであり、過去の変動を正しく理解することは、将来の気候変化予測の観点からも非常に重要である。しかしながら、浮遊性有孔虫の殻の中にホウ素はごく微量にしか含まれておらず、同位体比を正確に決定することは極めて困難である。特に、ホウ素はガラス器具や空気などにもふんだんに含まれるため、汚染を徹底的に低減しなければ正確な分析はできない。本研究課題では、国内の研究機関として初めて、浮遊性有孔虫の殻のホウ素同位体分析に成功した。
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Report
(3 results)
Research Products
(14 results)
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[Presentation] Last deglacial pCO2 reconstruction in the western equatorial Pacific: new findings and issues of boron isotope proxy.2019
Author(s)
Kubota, K., Yokoyama, Y., Ishikawa, T., Sagawa, T., Ikehara, M., Yamazaki.
Organizer
European Geosciences Union General Assembly 2019
Related Report
Int'l Joint Research
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[Presentation] Different CO2 history recorded in boron isotope ratio of two surface dwelling planktonic foraminifers2018
Author(s)
Kubota, K., Yokoyama, Y., Ishikawa, T., Sagawa, T., Ikehara, M., Yamazaki, T.
Organizer
Goldschmidt 2018
Related Report
Int'l Joint Research
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