Tracing the fate of atmospheric nitrate deposited onto the ecosystem using the triple oxygen isotopes as tracers

使用三氧同位素作为示踪剂追踪沉积在生态系统中的大气硝酸盐的命运

• 批准号: 20310003
• 负责人: TSUNOGAI Urumu
• 金额: $ 11.9万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20310003/
• 关键词: 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; 海洋化学

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.

测定了日本里什里岛降水(湿沉降)和地下水(泉水、湖水和溪水)中硝酸盐的稳定同位素组成，以便利用^&lt；17&gt；O异常(Δ^&lt；17&gt；O)来追踪沉积在该岛生态系统上的大气硝酸盐的去向。沉积的硝酸盐具有较大的^&lt；17&gt；O异常，Δ^&lt；17&gt；O平均值为+26.2‰。另一方面，地下水中的硝酸盐具有较小的Δ^&lt；17&gt；O值，范围为+0.9‰~3.2‰，相当于大气中硝酸盐与总硝酸盐的平均混合比为7%。因此，我们估计，直接排放的硝酸盐占该岛大气硝酸盐沉降量的10.5±5.2%，其余部分在从森林生态系统输出之前经过了生物处理。同时测定了日本马宿湖富营养化水体中硝酸盐的稳定同位素组成。这些数据随后被用来量化湖泊中硝酸盐的地球化学动态，方法是使用大气中硝酸盐在整个湖泊集水区的沉积速率。

项目成果

Photochemical histories of non-methane hydrocarbons inferred from their stable carbon isotope ratio measurements over East Asia

从东亚稳定碳同位素比测量推断非甲烷碳氢化合物的光化学历史

• 发表时间: 2009
• 期刊: J.Geophys. Res.(D11303, doi : 10.1029/2008JD011388) 114
• 作者: Saito;T.;K.Kawamura;U.Tsunogai;T.-Y.Chen;H.Matzueda;T.Nakatsuka;T.Gamo;M.Uematsu;B.J.Huebert
• 通讯作者: B.J.Huebert

陸域生態系における大気沈着窒素の浄化効率:市販のミネラル・ウォーターを用いた評価

陆地生态系统大气氮的净化效率：使用市售矿泉水进行评估

• 发表时间: 2009
• 作者: Tsunogai;U.;T. Kido;A. Hirota;S.B. Ohkubo;D.D. Komatsu;and F. Nakagawa;角皆潤・小松大祐・代田里子・桑原潤・中川書子;角皆潤・代田里子・小松大祐・中川書子
• 通讯作者: 角皆潤・代田里子・小松大祐・中川書子

Atmospheric Behavior of Nitrous Acid using Annular Denuder and Filter-Pack Method

使用环形剥蚀器和过滤包方法研究亚硝酸的大气行为

• 发表时间: 2010
• 作者: Noguchi;I.;K.Hayashi;T.Yamaguchi;K.Takagi;T.Fukazawa;H.Shibata;N.Saigusa;T.Ohizumi;K.Matsuda;U.Tsunogai;H.Hara
• 通讯作者: H.Hara

Quantifying nitrate dynamics in an oligotrophic lake using Δ17O

• DOI: 10.5194/bg-8-687-2011
• 发表时间: 2011-03
• 期刊: Biogeosciences
• 影响因子: 4.9
• 作者: U. Tsunogai;S. Daita;D. Komatsu;F. Nakagawa;A. Tanaka

一酸化二窒素の高精度三酸素同位体定量法開発

高精度一氧化二氮三氧同位素测定方法的研制

• 发表时间: 2008
• 作者: 小松大祐;石村豊穂;中川書子;角皆潤
• 通讯作者: 角皆潤