| タイトル |
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en
Tracing the fate of atmospheric nitrate deposited onto a forest ecosystem in Eastern Asia using Δ17O
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| 作成者 |
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| アクセス権 |
open access |
| 主題 |
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| 内容注記 |
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Abstract
en
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 17O anomalies (Δ17O) 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 17O anomalies with Δ17O values ranging from +20.8‰ to +34.5‰ (n = 32) with +26.2‰ being the annual average. The maximum Δ17O value of +34.5‰, obtained for precipitation on the 23rd to 24th of February 2007, was an extraordinarily large value among values for all samples of precipitation in Rishiri. Most nitrate in the sample might have been produced via NO3 radical in a highly polluted air mass that had been supplied from megacities on the eastern coast of the Asian continent. On the other hand, nitrate in groundwater had small Δ17O values ranging from +0.9‰ to 3.2‰ (n = 19), which corresponds to an mixing ratio of atmospheric nitrate to total nitrate of (7.4±2.6)%. Comparing the inflow and outflow of atmospheric nitrate in groundwater within the island, we estimated that the direct drainage accounts for (8.8±4.6)% 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.
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| 出版者 |
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Copernicus Publications
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| 日付 |
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| 言語 |
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| 資源タイプ |
journal article |
| 出版タイプ |
VoR |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/44834
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| 関連 |
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isIdenticalTo
DOI
https://doi.org/10.5194/acp-10-1809-2010
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| 収録誌情報 |
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PISSN
1680-7316
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EISSN
1680-7324
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NCID
AA12038447
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en
Atmospheric Chemistry and Physics
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巻10
号4
開始ページ1809
終了ページ1820
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| ファイル |
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| コンテンツ更新日時 |
2023-07-26 |
