Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-9-23073-2009
http://www.atmos-chem-phys-discuss.net/9/23073/2009/
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http://www.atmos-chem-phys-discuss.net/9/23073/2009/acpd-9-23073-2009.pdf
23073
23101
2009-11-02
Tracing the fate of atmospheric nitrate deposited onto a forest ecosystem in eastern Asia using Δ<sup>17</sup>O
U. Tsunogai
urumu@mail.sci.hokudai.ac.jp
D. D. Komatsu
S. Daita
G. Abbas Kazemi
F. Nakagawa
I. Noguchi
J. Zhang
Earth and Planetary System Science, Faculty of Science, Hokkaido University, Sapporo, Japan
Hokkaido Institute of Environmental Sciences, Sapporo, Japan
Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
now at: Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
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 <sup>17</sup>O anomalies (Δ<sup>17</sup>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 <sup>17</sup>O anomalies with Δ<sup>17</sup>O values ranging from
+20.8‰ to +34.5&permil (<i>n</i>= 32) with +26.2‰ being the annual
average. The maximum Δ<sup>17</sup>O value of +34.5‰, obtained for
precipitation on 23 to 24 February 2007, was an extraordinarily large value among values for
all samples of precipitation. Most nitrate in the sample might have been produced through
the heterogeneous reaction of NO<sub>3</sub> radical with hydrocarbons 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 Δ<sup>17</sup>O values
ranging from +0.9‰ to 3.2‰ (<i>n</i>=19), which corresponds to an average
mixing ratio of atmospheric nitrate to total nitrate of 7%. Comparing the inflow and
outflow of atmospheric nitrate in groundwater within the island, 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.
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