JpGU-AGU Joint Meeting 2017

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[JJ] Oral

H (Human Geosciences) » H-TT Technology & Techniques

[H-TT23] [JJ] Development and applications of environmental traceability methods

Tue. May 23, 2017 10:45 AM - 12:15 PM 106 (International Conference Hall 1F)

convener:Ichiro Tayasu(Research Institute for Humanity and Nature), Takanori Nakano(Research Institute for Humanity and Nature, Inter-University Research Institute Corporation National Institutes for the Humanities), Keisuke Koba(Center for Ecological Research, Kyoto University), Chairperson:Ichiro Tayasu(Research Institute for Humanity and Nature)

11:00 AM - 11:15 AM

[HTT23-08] Using environmental tracers to evaluate dynamics of nitrate sinkin Japan Sea stratovolcano areas.

*Takeru Hirai1, Kazuyoshi Asai2, Motoko Fujita3, Yumiko Watanabe4, Makoto Yamada5, Ryo Sugimoto1 (1.Fukui Prefectural University, 2.Geo Science CO.,Ltd., 3.Center for Southeast Asian Studies, Kyoto University, 4.Graduate School of Science, Kyoto University, 5.Research Institute for Humanity and Nature)

Keywords:nitrogen deposition, eutrophication, triple oxgen isotope, Sea of Japan

Atmospheric deposition of nitrogen transported from the East Asia is modifying terrestrial ecosystem of Japan. Although increasing trends of nitrate concentration are reported in several rivers facing to the Sea of Japan, there are little long-term data on the relationship between atmospheric nitrogen deposition and nitrate concentration of stream water. To clarify the relationship, we have retrospectively evaluated the impact of atmospheric nitrogen deposition on three watersheds (Site A: Mt.Daisen, Site B: Mt.Haku, Site C: Mt.Chokai) by using nitrate triple oxygen isotope (D17O) and sulfur hexafluoride (SF6) in spring water and groundwater.