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Tracing the fate of atmospheric nitrate deposited onto a forest ecosystem in Eastern Asia using Δ17O

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Title: Tracing the fate of atmospheric nitrate deposited onto a forest ecosystem in Eastern Asia using Δ17O
Authors: Tsunogai, U. Browse this author →KAKEN DB
Komatsu, D. D. Browse this author
Daita, S. Browse this author
Kazemi, G. A. Browse this author
Nakagawa, F. Browse this author →KAKEN DB
Noguchi, I. Browse this author
Zhang, J. Browse this author
Issue Date: 16-Feb-2010
Publisher: Copernicus Publications
Journal Title: Atmospheric Chemistry and Physics
Volume: 10
Issue: 4
Start Page: 1809
End Page: 1820
Publisher DOI: 10.5194/acp-10-1809-2010
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 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.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 角皆 潤

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