Nitrogen isotope fractionation and geological nitrogen cycle

氮同位素分馏和地质氮循环

• 批准号: 419380-2012
• 负责人: Li, Long
• 金额: $ 2.04万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=551610
• 关键词: Nitrogen; isotope; fractionation; geological; nitrogen

Light stable isotopes have become a routine and robust tool to trace material sources and monitor (bio)geochemical processes in planetary and geosciences. For example, carbon isotopes have been used to examine the carbon cycle in various temporal and spatial scales on the Earth. This effort has significantly advanced our understanding of the evolution of and interaction between the Earth's mantle, crust, and particularly atmosphere, in which the level of greenhouse gas CO2 directly impacts the climate and environment. In striking contrast, the cycle of nitrogen, a component equally important as carbon in all Earth's reservoirs, is still poorly understood even though several of its species (NH3, N2O, N2) also act as greenhouse gases. This has been mainly attributed to (1) the poor knowledge of nitrogen isotope effects in key processes controlling nitrogen transfer and siting at different pressure-temperature conditions and (2) poorly constrained boundary conditions to define the nitrogen properties of different reservoirs.

轻稳定同位素已成为追踪物质来源和监测行星和地球科学中（生物）地球化学过程的常规和强大的工具。例如，碳同位素已被用于研究地球上各种时空尺度的碳循环。这一努力极大地促进了我们对地球地幔、地壳，特别是大气层的演化和相互作用的理解，其中温室气体二氧化碳的水平直接影响气候和环境。与此形成鲜明对比的是，氮的循环，一个在地球所有水库中与碳同样重要的成分，仍然知之甚少，即使它的几种物种（NH3，N2 O，N2）也作为温室气体。这主要是由于（1）对控制氮迁移的关键过程中的氮同位素效应以及在不同压力-温度条件下的定位认识不足以及（2）限定不同储层的氮性质的边界条件约束不足。