Collaborative Research: Experimental constraints on marine Fe isotope effects - Biology, ligands, and particles

合作研究：海洋铁同位素效应的实验限制 - 生物学、配体和粒子

• 批准号: 1334029
• 负责人: Seth John
• 金额: $ 27.39万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2016-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1334029&HistoricalAwards=false
• 关键词: Collaborative; Research; Experimental; constraints; marine

Iron is an essential micronutrient for marine phytoplankton, which plays a key role in the global carbon cycle and marine ecosystems, and there is a need to better understand the sources and sinks of this essential micronutrient in the oceans. Iron isotopes are a recently developed tracer of iron biogeochemical cycling, and new iron isotope results indicate that iron-binding ligands may play a critical role in the isotopic fractionation of dissolved iron. At present, however, the quantitative importance of iron dissolution or biological iron uptake in the isotopic fractionation of dissolved iron in the oceans is not well-known. In this study, researchers from the University of South Carolina and the Bermuda Institute of Ocean Sciences will collect and analyze samples from the Bermuda Atlantic Time-series Station (BATS) in order to; 1) measure the rate and isotope fractionation of iron dissolution from natural aerosols and oxic sediments in the presence of natural iron-binding ligands, and; 2) examine how phytoplankton fractionate iron isotopes during biological uptake. Results from this study will advance the development of iron isotopes as a tool for tracing iron biogeochemical cycling in the oceans.Broader Impacts: The project will provide scientific training and development to undergraduate, graduate, and postdoctoral students. Results of the study will be used to raise public awareness of biogeochemical science via a webpage, outreach activities, and public tours at the Bermuda Institute of Ocean Sciences.

铁是海洋浮游植物必需的微量营养素，在全球碳循环和海洋生态系统中发挥着关键作用，需要更好地了解海洋中这种必需微量营养素的来源和汇。铁同位素是最近开发的铁生物地球化学循环示踪剂，新的铁同位素结果表明铁结合配体可能在溶解铁的同位素分馏中发挥关键作用。然而，目前，铁溶解或生物铁吸收在海洋中溶解铁的同位素分馏中的定量重要性尚不清楚。在这项研究中，南卡罗来纳大学和百慕大海洋科学研究所的研究人员将收集并分析来自百慕大大西洋时间序列站（BATS）的样本，以便： 1) 在天然铁结合配体存在的情况下，测量天然气溶胶和含氧沉积物中铁溶解的速率和同位素分馏； 2）检查浮游植物在生物吸收过程中如何分离铁同位素。这项研究的结果将推动铁同位素的发展，作为追踪海洋中铁生物地球化学循环的工具。更广泛的影响：该项目将为本科生、研究生和博士后提供科学培训和发展。研究结果将用于通过百慕大海洋科学研究所的网页、外展活动和公众参观来提高公众对生物地球化学科学的认识。