Source estimation of NOx in forest ambient air using nitrogen isotopic composition
| Project/Area Number |
26660131
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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 |
Forest science
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| Research Institution | National Institute for Environmental Studies |
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Principal Investigator |
Watanabe Mirai 国立研究開発法人国立環境研究所, 地域環境研究センター, 主任研究員 (50455250)
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| Co-Investigator(Kenkyū-buntansha) |
高津 文人 国立研究開発法人国立環境研究所, 地域環境研究センター, 室長 (30514327)
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| Co-Investigator(Renkei-kenkyūsha) |
Koba Keisuke 国立大学法人京都大学, 生態学研究センター, 教授 (90311745)
Nishina Kazuya 国立研究開発法人 国立環境研究所, 地域環境研究センター, 主任研究員 (60637776)
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| Research Collaborator |
Murata Eriko
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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 |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 窒素酸化物 / 窒素安定同位体比 / 窒素飽和 |
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| Outline of Final Research Achievements |
In this study, we developed a new method to measure nitrogen isotopic composition of nitrogen oxides (δ15N-NOx) in actual environments. This method can capture the NOx quantitatively by the filter pack method, and analyze δ15N-NOx without fractionations by the denirifier method. We applied this method to trace the source of NOx in ambient air of a nitrogen-saturated forest. The field experiments showed that δ15N-NOx in forest ambient air was lower than δ15N-NOx in urban ambient air but higher than δ15N-NOx released from soils. Two-source mixing model suggested that forest NOx consisted of 81% of urban NOx and 19% of soil-released NOx.
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Report
(4 results)
Research Products
(4 results)
