CAREER: The Role of Iron and Reactive Oxygen Species in the Oxidation and Fate of DOM in Natural Waters

职业：铁和活性氧在天然水中 DOM 的氧化和归宿中的作用

• 批准号: 1351745
• 负责人: Rose Cory
• 金额: $ 59.57万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1351745&HistoricalAwards=false
• 关键词: CAREER; Role; Iron; Reactive; Oxygen

Title: The role of iron and reactive oxygen species in the oxidation and fate of DOM in natural waters This study will determine the direct and indirect roles of iron in both light and dark reactions involving DOM degradation, and estimate the importance of iron in determining whether this degradation will shunt C as DOM down rivers to oceans, or fully oxidize C to CO2 released to the atmosphere. The proposed work will advance our understanding of the degradation of soil carbon exposed to oxygen or sunlight at Earth?s surface during land-surface disturbances. This knowledge will allow scientists to better predict the fate of C in arctic permafrost soils, and through an education and outreach plan, will allow society to better prepare for the potential acceleration of global warming through a positive feedback from the thawing Arctic. To engage underrepresented students in science, the PI proposes to expand the infrastructure of education through partnerships that will offer new opportunities to enhance teaching and communication skills. The PI will develop a curriculum in earth and environmental science integrated with her research, grounded in core education principles, and mapped to assessment goals. A novel contribution to curriculum development will be the combination of (1) education modules that ?telescope? in age-context and difficulty from K-12 to undergraduate to adult outreach levels, (2) data generation on student engagement and learning through micro-assessments of performance, and (3) enhanced active learning by iterative improvement of modules by students for their own peer groups. This research will be done in the Alaskan Arctic because (1) the lakes, streams, and soil waters provide a natural experimental matrix of both high and low light, oxygen, DOM and Fe concentrations, and (2) there are tremendous stores of organic C in frozen soils (at least twice the amount of C now in the atmosphere) which are rapidly thawing from global warming. Using field surveys and experiments on natural waters to test mechanistic hypotheses, the PI will answer two main research questions: (1) Do reactions mediated by iron favor the complete oxidation of DOM to CO2 by sunlight and microbes? (2) Is the iron-mediated oxidation of DOM in the dark an important determinant of DOM fate?

标题：铁和活性氧种类在DOM在自然水域的氧化和命运中的作用这项研究将确定铁在涉及DOM降解的光和黑暗反应中的直接和间接作用，并估算铁在确定该降解是否会降低C dom c c co co co2 co2 co2 co2 cop co2的重要性。拟议的工作将提高我们对在土地表面干扰期间暴露于氧气或阳光的土壤碳降解的理解。这些知识将使科学家能够更好地预测北极冻土土壤中C的命运，并通过教育和外展计划，使社会通过融化的北极北极反馈来更好地为全球变暖的潜在加速做好准备。为了让代表性不足的学生参与科学，PI建议通过伙伴关系扩大教育基础设施，这些伙伴关系将为增强教学和沟通技巧提供新的机会。 PI将在地球和环境科学的研究中开发与她的研究相结合的课程，基于核心教育原则，并映射到评估目标。 （1）望远镜的教育模块的组合将是对课程发展的新颖贡献？ （2）通过微观评估，从K-12到本科到成人外展水平的年龄和难度，（2）有关学生参与和学习的数据，以及（3）通过迭代的学生对自己的同伴组的模块的迭代改进来增强积极的学习。这项研究将在阿拉斯加北极进行，因为（1）（1）湖泊，溪流和土壤水提供了具有高光和低光，氧气，DOM和Fe浓度的自然实验矩阵，以及（2）有机c在冷冻土壤中有大量的有机C储存（至少是在大气中至少是Cagry Cappry the Global the Global the Alll Global Teming wempering the Global wempering the Capters c的C）。使用现场调查和在自然水上进行实验来检验机械假设，PI将回答两个主要的研究问题：（1）铁促进的反应是否有利于Sunlight和Microbes将DOM完全氧化为CO2的完全氧化？ （2）在黑暗中铁介导的DOM的氧化是否是DOM命运的重要决定因素？