Collaborative Research: How and why eNd Tracks Ocean Circulation
合作研究:eNd 如何以及为何追踪海洋环流
基本信息
- 批准号:2037556
- 负责人:
- 金额:$ 18.62万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2020
- 资助国家:美国
- 起止时间:2020-01-01 至 2024-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Circulation of water is a fundamental trait of the oceans that impacts its physics, chemistry and biology; however, understanding modern and past patterns of circulation - especially in the vast bodies of deep water - is challenging because global circulation defies direct measurement. The problems with direct measurement largely stem from the vast scales of space and time that are of interest in understanding global circulation. One tool for estimating global circulation patterns that holds promise is seen in neodymium isotopes which appear to be powerful tracers of deep ocean circulation, over a variety of timescales. Unfortunately, the elemental behavior of neodymium contrasts the isotopic behavior of neodymium in the oceans, a puzzle branded the "neodymium paradox." This inconsistency of geochemical behavior opens to question the application of neodymium isotopes as a tracer of circulation. Therefore, scientists from Oregon State University, Tulane University, and Bigelow Laboratory of Ocean Sciences propose to test the hypothesis that there is a yet unconstrained (even poorly identified) source of neodymium to the oceans that can explain the discrepancies seen between the elemental and isotopic neodymium marine budgets. The scientists further seek to understand the mechanistic cause of this source and thus be able to start making global constraints on its influence. Understanding these processes will fundamentally change our interpretations of neodymium data and allow us to more accurately quantify ocean circulation with a greater degree of confidence. For outreach activities, the scientists plan to participate in open house days held at Oregon State University, da Vinci days, National Ocean Science Bowls, Salmon Bowl and Bigelow Laboratory for Ocean Sciences' Cafe Scientifique. Undergraduate students and one graduate student from Tulane University would be supported and trained as part of this project. Scientists from Oregon State University, Tulane University, and Bigelow Laboratory for Ocean Sciences propose to test the hypothesis that there is a benthic source of neodymium (Nd) to the oceans that exerts a primary control over the distribution of this element and its isotopes (eNd) in the ocean. This benthic flux results from early diagenetic reactions that release rare earth elements (REEs) from the solid phase to pore fluid. The scientists contend this flux will explain eNd distributions throughout the modern and past global oceans. The planned research will be guided by three questions:(1) What are the mechanisms that control the magnitude and isotope composition of the benthic flux?(2) What are the relationships among bottom water, pore fluid, and the terminal solid phase compositions? Particularly, how and under what chemical conditions does an eNd signature become part of a preserved archival record of [Nd] and eNd?(3) Can our understanding of the deep water benthic fluxes account for the integrated bottom water eNd as a function of apparent water mass age and circulation path (e.g., how do the pore fluid and solid phase values reconcile with the existing water column signature and water mass age data)?To test these ideas, sediments and their pore fluids will be collected from a diverse set of deep sea sites in the Pacific Ocean that reflect slow-to-fast sedimentation rates, carbonate-, terrigenous-, volcaniclastic- and siliceous-sediment, and low-to-high organic carbon. The sediments and porewater samples, as well as samples from the overlying water column will be characterized for the following parameters: major, minor, and trace metals, Nd isotopes, carbonate chemistry, oxygen, nutrients, particulate organic carbon, particulate organic nitrogen, radiocarbon, porosity, and grain size. With these observations we will build a quantitative numeric geochemical model (e.g., PHREEQC, Geochemist's Workbench, Humic Ion Binding Model) that can capture the cardinal controls over the benthic source. Our goal is to provide a new interpretive framework for Nd and eNd, such that we can offer quantitative estimates of benthic fluxes for use in models of global circulation. This work has potentially transformative implications on our understanding and application of REEs and Nd isotope data in both the modern and ancient oceans.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
水循环是影响海洋物理、化学和生物的基本特征;然而,理解现代和过去的环流模式——尤其是在巨大的深水区——是具有挑战性的,因为全球环流无法直接测量。直接测量的问题很大程度上源于空间和时间的巨大尺度,这对理解全球环流很有意义。估计全球环流模式的一种工具是在钕同位素中看到的,它似乎是深海环流在各种时间尺度上的有力示踪剂。不幸的是,钕的元素行为与钕在海洋中的同位素行为形成了对比,这是一个被称为“钕悖论”的谜题。地球化学行为的这种不一致使钕同位素作为循环示踪剂的应用受到质疑。因此,来自俄勒冈州立大学、杜兰大学和毕格罗海洋科学实验室的科学家们提议测试这样一个假设,即海洋中存在一种不受限制的(甚至尚未确定的)钕来源,可以解释海洋中元素钕和同位素钕预算之间的差异。科学家们进一步寻求了解这一来源的机制原因,从而能够开始对其影响进行全球限制。了解这些过程将从根本上改变我们对钕数据的解释,并使我们能够更准确地量化海洋环流,更有信心。在拓展活动方面,科学家们计划参加在俄勒冈州立大学举行的开放日、达芬奇日、国家海洋科学碗、鲑鱼碗和毕格罗海洋科学实验室的科学咖啡馆。作为该项目的一部分,杜兰大学的本科生和一名研究生将得到支持和培训。来自俄勒冈州立大学、杜兰大学和毕格罗海洋科学实验室的科学家们提议测试这样一个假设:海洋中有一种底底生物来源的钕(Nd),它对这种元素及其同位素(eNd)在海洋中的分布起着主要的控制作用。这种底栖通量是由早期成岩反应引起的,这些反应将稀土元素从固相释放到孔隙流体中。科学家们认为,这种通量将解释现代和过去全球海洋中的eNd分布。计划中的研究将以三个问题为指导:(1)控制底栖生物通量的大小和同位素组成的机制是什么?(2)底水、孔隙流体与终端固相组成之间有何关系?特别是,eNd签名如何以及在什么化学条件下成为[Nd]和eNd保存的档案记录的一部分?(3)我们对深水底栖生物通量的理解能否解释作为表观水团年龄和循环路径函数的综合底水eNd(例如孔隙流体和固相值如何与现有水柱特征和水团年龄数据相协调)?为了验证这些想法,沉积物及其孔隙流体将从太平洋不同的深海地点收集,这些地点反映了从慢到快的沉积速率,碳酸盐,陆源,火山碎屑和硅质沉积物,以及低到高的有机碳。沉积物和孔隙水样品以及上覆水柱样品将进行以下参数表征:主要、次要和痕量金属、Nd同位素、碳酸盐化学、氧、营养物质、颗粒有机碳、颗粒有机氮、放射性碳、孔隙度和粒度。通过这些观察,我们将建立一个定量的数值地球化学模型(例如,PHREEQC,地球化学家的工作台,腐植酸离子结合模型),可以捕获对底栖生物来源的基本控制。我们的目标是为Nd和eNd提供一个新的解释框架,这样我们就可以提供用于全球环流模式的底栖生物通量的定量估计。这项工作对我们对现代和古代海洋中稀土和钕同位素数据的理解和应用具有潜在的变革性意义。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Evolution of rare earth element and εNd compositions of Gulf of Mexico seawater during interaction with Mississippi River sediment
墨西哥湾海水与密西西比河沉积物相互作用过程中稀土元素和μNd成分的演变
- DOI:10.1016/j.gca.2022.08.024
- 发表时间:2022
- 期刊:
- 影响因子:5
- 作者:Adebayo, Segun B.;Cui, Minming;Williams, Thomas J.;Martin, Ellen;Johannesson, Karen H.
- 通讯作者:Johannesson, Karen H.
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Karen Johannesson其他文献
Radiogenic isotope: Not just about words
- DOI:
10.1016/j.apgeochem.2022.105348 - 发表时间:
2022-07-01 - 期刊:
- 影响因子:
- 作者:
Olivier Pourret;Karen Johannesson - 通讯作者:
Karen Johannesson
Karen Johannesson的其他文献
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{{ truncateString('Karen Johannesson', 18)}}的其他基金
Acquisition of a high resolution inductively coupled plasma mass spectrometer and ion chromatograph for environmental biogeochemical research and teaching at UMass Boston
购买高分辨率电感耦合等离子体质谱仪和离子色谱仪,用于麻省大学波士顿分校的环境生物地球化学研究和教学
- 批准号:
2034420 - 财政年份:2021
- 资助金额:
$ 18.62万 - 项目类别:
Standard Grant
Quantifying thioarsenate formation constants to advance understanding of arsenic biogeochemical cycling in anoxic waters
量化硫代砷酸盐形成常数以增进对缺氧水中砷生物地球化学循环的理解
- 批准号:
2037553 - 财政年份:2020
- 资助金额:
$ 18.62万 - 项目类别:
Standard Grant
Collaborative Research: How and why eNd Tracks Ocean Circulation
合作研究:eNd 如何以及为何追踪海洋环流
- 批准号:
1850768 - 财政年份:2019
- 资助金额:
$ 18.62万 - 项目类别:
Standard Grant
Quantifying thioarsenate formation constants to advance understanding of arsenic biogeochemical cycling in anoxic waters
量化硫代砷酸盐形成常数以增进对缺氧水中砷生物地球化学循环的理解
- 批准号:
1714030 - 财政年份:2017
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Standard Grant
WSC-Category 1: From natural wetland to murky water: Cross-disciplinary analysis of a drowning urbanized coast
WSC-类别 1:从自然湿地到浑水:淹没城市化海岸的跨学科分析
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1204796 - 财政年份:2012
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Collaborative Research: Are buried paleochannels effective reactors for water and solute transport in the deltaic subterranean estuary?
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1141692 - 财政年份:2012
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$ 18.62万 - 项目类别:
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Acquisition of a high performance liquid chromatograph for the enhancement of biogeochemical education and research of trace element speciation in environmental systems
购买高性能液相色谱仪,以加强生物地球化学教育和环境系统中微量元素形态的研究
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1029246 - 财政年份:2010
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Collaborative Research: Chemical Hydrogeologic Investigations of Tungsten: Field, Laboratory, and Modeling Studies of an Emerging Environmental Contaminant
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1014946 - 财政年份:2010
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$ 18.62万 - 项目类别:
Continuing Grant
ETBC: Collaborative Research: Evaluating the Role of Submarine Groundwater Discharge in the Oceanic Nd Budget
ETBC:合作研究:评估海底地下水排放在海洋 Nd 预算中的作用
- 批准号:
0825920 - 财政年份:2008
- 资助金额:
$ 18.62万 - 项目类别:
Standard Grant
Hydrogeochemical Evolution of Arsenic Concentrations and Speciation Along Groundwater Flow Paths: Linking Aqueous and Solid Phase Arsenic Speciation in Sedimentary Aquifers
沿地下水流路的砷浓度和形态的水文地球化学演化:连接沉积含水层中的水相和固相砷形态
- 批准号:
0805332 - 财政年份:2007
- 资助金额:
$ 18.62万 - 项目类别:
Continuing Grant
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