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: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=531401
• 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.

轻稳定的同位素已成为跟踪行星和地球科学中材料来源和监测（BIO）地球化学过程的常规和强大工具。例如，碳同位素已用于在地球上各种时空和空间尺度中检查碳循环。这项努力极大地提高了我们对地球，地壳，尤其是尤其是气氛之间对地球地幔的演变和相互作用的理解，其中温室气体二氧化碳的水平直接影响了气候和环境。与之形成鲜明对比的是，即使其几种物种（NH3，N2O，N2）也充当温室气体，氮的循环（在全地球的储层中也与碳同样重要的成分一样重要。这主要归因于（1）在控制氮转移和位置在不同压力温度条件下的关键过程中对氮同位素效应的知识不足，以及（2）限制的边界条件不良，以定义不同储层的氮性质。