The oxygen isotope anomaly of nitrate as tracer of atmospheric nitrate in marine nitrogen cycling
| Project/Area Number |
26550007
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Tokai University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 硝酸 / 安定同位体 / 三酸素同位体 / 化学海洋学 / 窒素循環 |
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| Outline of Final Research Achievements |
The triple oxygen isotopic compositions of oceanic nitrate can be an useful tracer to quantify the mixing ratios of depositional nitrate within total nitrate in a water mass, because atmospheric nitrate shows large 17O anomaly due to the contribution of atmospheric ozone having large anomaly, whereas re-mineralized nitrate produced biologically shows little 17O anomaly. Determination on the triple oxygen isotopic compositions of nitrate allows us to estimate the mixing ratios of depositional nitrate within total nitrate.
To determine oxygen isotopic compositions of nitrate, nitrate must be reduced to nitrous oxide following to nitrite. Using Cu-coated Cd for reduction to nitrite allow us to save analytical time. We developed new automated analytical system for oxygen isotopic compositions of nitrate at Tokai university. We started to analyze stable isotopic compositions of oceanic nitrate during KH-14-6 of GEOTRACES cruise.
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Report
(4 results)
Research Products
(13 results)
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[Journal Article] Deep Microbial Life in High-Quality Granitic Groundwater from Geochemically and Geographically Distinct Underground Boreholes.2016
Author(s)
Ino, K., U. Konno, M. Kouduka, A. Hirota, Y. Togo, A. Fukuda, D. Komatsu, U. Tsunogai, A.S. Tanabe, S. Yamamoto, T. Iwatsuki, T. Mizuno, K. Ito, Y. Suzuki
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Journal Title
Environmental Microbiology Reports
Volume: 8
Issue: 2
Pages: 285-294
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Hydrothermal plumes in the Gulf of Aden, as characterized from light transmission, Mn, Fe, CH4 and δ13C-CH4 anomalies.2015
Author(s)
Gamo, T., K. Okamura, H. Hatanaka, H. Hasumoto, D. Komatsu, M. Chinen, M. Mori, J. Tanaka, A. Hirota, U. Tsunogai, K. Tamaki
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Journal Title
Deep-Sea Research Part II
Volume: 121
Pages: 62-70
DOI
Related Report
Peer Reviewed
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[Journal Article] Quantifying the effects of clear-cutting and strip-cutting on nitrate dynamics in a forested watershed using triple oxygen isotopes as tracers2014
Author(s)
Tsunogai, U., Komatsu, D. D., Ohyama, T., Suzuki, A., Nakagawa, F., Noguchi, I., Takagi, K., Nomura, M., Fukuzawa, K., and Shibata, H.
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Journal Title
Biogeosciences
Volume: 11
Issue: 19
Pages: 5411-5424
DOI
Related Report
Peer Reviewed / Open Access
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