Determination of total N2 fixation in the ocean taking into account both the particulate and filtrate fractions
Project/Area Number |
22710001
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Single-year Grants |
Research Field |
Environmental dynamic analysis
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Research Institution | Hokkaido University |
Principal Investigator |
NAKAGAWA Fumiko 北海道大学, 大学院・理学研究院, 助教 (70360899)
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Project Period (FY) |
2010 – 2011
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Project Status |
Completed (Fiscal Year 2011)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
|
Keywords | 窒素固定速度 / PON画分 / TDN画分 / 海洋 / 窒素同位体組成 / 窒素固定 / 硝酸 / 一次生産 / 西部北太平洋 |
Research Abstract |
Using the^<15> N_2 tracer method and high-sensitivity stable nitrogen isotopic composition analytical systems, we determined N2 fixation rates for ocean samples by dividing them into particulate and filtrate fractions. While N_2 fixation in the filtrate fraction had been ignored in previous studies, we found a significant N_2 fixation rates in the filtrate fraction in our study.
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Report
(3 results)
Research Products
(42 results)
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[Presentation] Breakthrough in Isotope-Ratio Mass Spectrometry2011
Author(s)
Tsunogai, U., D. D. Komatsu, and F. Nakagawa
Organizer
Pre-seminar 2011 in Busan, Meeting on Isotope-ratio mass spectrometry, The Mass Spectrometry Society of Japan, Haeundae Grand Hotel in
Place of Presentation
Busan, Korea
Year and Date
2011-11-23
Related Report
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[Presentation] Regional differences in the photochemical reaction paths of NOX estimated from the 17O tracer of nitrate(P22)2011
Author(s)
Ohayama, T., D. D. Komatsu, S. Daita, F. Nakagawa, U. Tsunogai, I. Noguchi, T. Yamaguchi, K. Sato, T. Ohizumi, K. Tsuboi
Organizer
Meeting on Isotope-ratio mass spectrometry, The Mass Spectrometry Society of Japan
Place of Presentation
Busan, Korea
Year and Date
2011-11-23
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[Presentation] 17O, 18O, 15Nをトレーサーに用いた陸水環境における溶存硝酸の起源および窒素循環の解析法2011
Author(s)
中川書子,鈴木敦之,大山拓也,小松大祐,角皆潤,梅田信,柴田英昭,小畑元,田副博文
Organizer
2011年度日本地球化学会第58回年会
Place of Presentation
北海道大学学術交流会館
Year and Date
2011-09-16
Related Report
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[Presentation] 170,180,15Nをトレーサーに用いた陸水環境における溶存硝酸の起源および窒素循環の解析法2011
Author(s)
中川書子, 鈴木敦之, 大山拓也, 小松大祐, 角皆潤, 梅田信, 柴田英昭, 小畑元, 田副博文
Organizer
日本地球化学会
Place of Presentation
北海道大学(札幌市)
Year and Date
2011-09-14
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[Presentation] 硝酸の三酸素同位体組成を指標に用いたNOxの光化学反応過程の解析2011
Author(s)
大山拓也,角皆潤,小松大祐,代田里子,中川書子,野口泉,山口高志,佐藤啓市,大泉毅,坪井一寛,木戸瑞佳
Organizer
2011年度日本地球化学会第58回年会
Place of Presentation
北海道大学学術交流会館
Related Report
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[Presentation] Tracing the fate of atmospheric nitrate deposited onto an oligotrophic lake in eastern Asia(B51H-0459)2010
Author(s)
Tsunogai, U., Daita, S., Komatsu, D. D., Nakagawa, F., Tanaka, A.
Organizer
2010 AGU Fall Meeting
Place of Presentation
Moscone Convention Center, San Francisco, California, USA.
Related Report
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[Presentation] Tracing atmospheric nitrate deposited onto western north Pacific ocean(B31C-0314)2010
Author(s)
Komatsu, D. D., Tsunogai, U., Daita, S., Konno, U., Ohkubo, S. B. Nakagawa, F.
Organizer
2010 AGU Fall Meeting
Place of Presentation
Moscone Convention Center, San Francisco, California, USA.
Related Report
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