2010 Fiscal Year Final Research Report
Tracing the fate of atmospheric nitrate deposited onto the ecosystem using the triple oxygen isotopes as tracers
| Project/Area Number |
20310003
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Hokkaido University |
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Principal Investigator |
TSUNOGAI Urumu Hokkaido University, 大学院・理学研究院, 准教授 (50313367)
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| Co-Investigator(Kenkyū-buntansha) |
TANIMOTO Hiroshi 独立行政法人国立環境研究所, 大気圏環境研究領域・大気化学研究室, 室長 (30342736)
KANDA Jota 東京海洋大学, 海洋科学部, 教授 (60202032)
NOGUCHI Izumi 北海道環境科学研究センター, 環境科学部, 主任研究員兼環境科学科長 (10442617)
KOMATSU Daisuke 北海道大学, 大学院・理学研究院, 博士研究員 (70422011)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 一次生産 / 三酸素同位体 / 大気化学 / 栄養塩 / 水環境 / 窒素沈着 / 陸水学 |
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| Research Abstract |
The stable isotopic compositions of nitrate in precipitation (wet deposition) and groundwater (spring, lake, and stream water) were determined for the island of Rishiri, Japan, so as to use the ^<17>O anomalies (Δ^<17>O) to trace the fate of atmospheric nitrate that had deposited onto the island ecosystem, which is a representative background forest ecosystem for eastern Asia. The deposited nitrate had large ^<17>O anomalies with Δ^<17>O values with +26.2 ‰ being the annual average. On the other hand, nitrate in groundwater had small Δ^<17>O values ranging from +0.9‰ to 3.2‰, which corresponds to an average mixing ratio of atmospheric nitrate to total nitrate of 7%. Thus, we estimated that the direct drainage accounts for 10.5 ± 5.2% of atmospheric nitrate that has deposited on the island and that the residual portion has undergone biological processing before being exported from the forest ecosystem. The stable isotopic compositions of nitrate were determined in the oligotrophic water column of Lake Mashu, Japan, as well. These data were then used to quantify the geochemical dynamics of nitrate in the lake, by using the deposition rate of the atmospheric nitrate onto the entire catchment area of the lake.
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[Journal Article] 北日本における亜硝酸ガス濃度と窒素酸化物由来成分の挙動2010
Author(s)
野口泉,林健太郎,加藤拓紀,山口高志,秋山雅行,大塚英幸,酒井茂克,高木健太郎,深澤達矢,柴田英昭,藤沼康実,三枝信子,下鳥稔,遠藤朋美,家合浩明,松田和秀,角皆潤,原宏
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Journal Title
大気環境学会誌 45
Pages: 153-165
Peer Reviewed
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