ANALYSIS OF GEOCHEMICAL CYCLES OF NITROUS OXIDE AND METHANE THROUGH ISOTOPE TRACERS

通过同位素示踪剂分析一氧化二氮和甲烷的地球化学循环

• 批准号: 05640548
• 负责人: YOSHIDA Naohiro
• 金额: $ 1.41万
• 依托单位: INSTITUTE FOR HYDROSPHERIC-ATMOSPHERIC SCIENCES,NAGOYA UNIVERSITY (1994)University of Toyama (1993)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640548/
• 关键词: NITROUS OXIDE; METHANE; GEOCHEMICAL CYCLE; NITROGEN ISOTOPE RATIO; OXYGEN ISOTOPE RATIO; CARBON ISOTOPE RATIO; HYDROGEN ISOTOPE RATIO; 窒素同位体; 酸素同位体; 水素同位体; 炭素同位体

(1) Nitrogen isotope ratio in nitrous oxide is found to be not determined by equilibrium with sea water, fresh water, and nitrogen molecule in the atmosphere, but by kinetic isotope fractionation during production and consumption. Oxygen isotope ratio is higher than 40* with areal variation, suggesting oxygen isotope exchange during or after production.(2) Carbon isotope ratio in methane is mainly determined by kinetic isotope fractionation during production. Whereas, hydrogen isotope ratio is varing with latitude, suggesting the reflection of environmental water during production. Carbon-14 analysis with accelarator mass spectrometer is uuder preparation, some of the data has been taken.(3) Environmental water, which is closely related to oxygen isotope ratio in N_2O and hydrogen isotpe ratio in CH_4, shows latitudinal gradient. Hydrogen isotope ratio in CH_4 and water are closely related with each other.(4) Gaschromatograph equipped with electron capture detector was not introduced because of the lack in royal settlement. I have gotten the license of ratiation protection manager and rule for the protection of radiation hazard has been settled. So that, it will be introduced in the next fiscal year.

（1）发现一氧化二氮的氮同位素比不通过海水，淡水和氮分子在大气中的平衡来确定，而是通过生产和消费期间的动力学同位素分馏来确定。氧同位素比高于40*，其氧气变异表明在生产过程中或之后进行氧同位素交换。（2）甲烷中的碳同位素比主要由生产过程中的动力学同位素分馏确定。而氢同位素比与纬度有所不同，表明在生产过程中反射环境水。加速器质谱仪的碳14分析是uuder的制备，已经采集了一些数据。（3）环境水与n_2O中的氧同位素比密切相关，而CH_4中的氢同位素比显示出纬度梯度。 CH_4中的氢同位素比彼此密切相关。（4）由于缺乏皇家沉降，配备了带有电子捕获探测器的气体形式仪。我已经获得了统治保护经理的许可，并且已经解决了保护辐射危害的规则。这样，它将在下一个财政年度引入。

项目成果

Moriizumi, J.et al.: "Origin and behavior of atmospheric methane inferred from carbon isotopic analyzes (II)" Summaries of Researches Using AMS at Nagoya University. 5. 170-177 (1994)

Moriizumi, J.等人：“根据碳同位素分析推断大气甲烷的起源和行为 (II)”名古屋大学使用 AMS 的研究摘要。

K.Minami: "CH_4 and N_2O: Global Emissions and Controls from Rice Fields and Other Agricultural and Industrial Sources." 養賢堂, 234 (1994)

K.Minami：“CH_4 和 N_2O：稻田和其他农业和工业来源的全球排放和控制”，Yokendo，234 (1994)。

Mizota,C.: "A reconnaissance oxygen isotopic study of authigenic phosphates from soils and sediments." Clays and Clay Minerals. (in press). (1995)

Mizota,C.：“对土壤和沉积物中自生磷酸盐的勘察氧同位素研究。”

Yoshida,N.: "Stable isotope ratios in atmospheric nitrous oxide" Proc.Fifth Int.Workshop on Nitrous Oxide Emissions. 17-23 (1993)

Yoshida,N.：“大气一氧化二氮中的稳定同位素比率”Proc.第五届一氧化二氮排放国际研讨会。

D.D.Adams: "Cycling of Reduced Gases in the Hydrosphere." E.Schweizerbart′she Verlangsbuchhandlungen,Stuttgart (in press), (1995)

D.D.Adams：“水圈中还原气体的循环”，E.Schweizerbartshe Verlangsbuchhandlungen，斯图加特（印刷中），（1995 年）