Collaborative Research: US GEOTRACES PMT: Sources and Rates of Trace Element and Isotope Cycling Derived from the Radium Quartet
合作研究:美国 GEOTRACES PMT:源自镭四重奏的微量元素和同位素循环的来源和速率
基本信息
- 批准号:1736321
- 负责人:
- 金额:$ 11.3万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-02-01 至 2024-01-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. Naturally occurring radioactive isotopes of the element radium can be used to measure the rates of important processes in the ocean. In turn, making these rate measurements at the same time as other trace element and isotope data are collected enables a more complete interpretation of these data. The investigators propose to measure the four isotopes of radium -- Ra-223, Ra-224, Ra-226, and Ra-228 -- on a U.S. GEOTRACES expedition from Alaska to Tahiti in 2018. The radium isotope data will be particularly useful in investigating trace element input and removal processes associated with ocean boundaries (rivers, continental shelves, and the ocean bottom) and with mid-ocean ridge hydrothermal vents and the long-range dispersal of their neutrally buoyant plumes. The investigators will also investigate the processes controlling the internal cycling of the longest-lived isotope, Ra-226, compared to the element barium, which has a very similar chemistry to radium. The proposed work would address a number of key questions regarding trace element inputs from ocean boundaries and their potential impact on ocean productivity and biogeochemistry. As iron is an important nutrient for marine phytoplankton, the investigators will quantify the rates of lateral trace element transport from the Gulf of Alaska margin out to and including the offshore High Nutrient Low Chlorophyll region of the subarctic Northeast Pacific Ocean. In the ocean subsurface, they will seek to understand the trace element fluxes associated with high temperature hydrothermal venting, and the rate at which trace elements and isotopes are removed via scavenging along the hydrothermal plume. Lastly, the work will lead to an improved understanding of a marine carbonate sediment dating technique via an investigation of Ra-226 and barium fractionation processes in the upper ocean. The project will involve collaboration between two U.S. institutions and a partner in France who will analyze some of the samples. Two graduate students will participate in the project. Moore will supervise an undergraduate student through the South Carolina Alliance for Minority Participation, and will encourage this student to develop a senior thesis based on their participation in this project.
国际GEOTRACES计划的目标是了解微量化学元素及其同位素在海洋中的分布。镭元素的天然放射性同位素可用于测量海洋中重要过程的速率。反过来,在收集其他微量元素和同位素数据的同时进行这些速率测量能够更完整地解释这些数据。研究人员建议在2018年从阿拉斯加到塔希提岛的美国GEOTRACES探险中测量镭的四种同位素- Ra-223,Ra-224,Ra-226和Ra-228。镭同位素数据将特别有助于调查与海洋边界(河流、大陆架和洋底)和大洋中脊热液喷口及其中性浮力羽流的远距离扩散有关的微量元素输入和清除过程。调查人员还将调查控制寿命最长的同位素Ra-226的内部循环的过程,而钡元素的化学性质与镭非常相似,拟议的工作将解决有关海洋边界微量元素输入及其对海洋生产力和海洋地球化学的潜在影响的一些关键问题。由于铁是海洋浮游植物的重要营养素,研究人员将量化从阿拉斯加湾边缘到亚北极东北太平洋近海高营养低叶绿素区域(包括该区域)的微量元素横向运输速率。在海洋地下,他们将设法了解与高温热液喷口有关的微量元素通量,以及微量元素和同位素通过沿着热液羽流清除而被清除的速率。最后,这项工作将通过调查海洋上层的Ra-226和钡分馏过程,提高对海洋碳酸盐沉积物测年技术的认识。该项目将涉及两个美国机构和一个法国合作伙伴之间的合作,后者将分析一些样本。两名研究生将参与该项目。摩尔将通过南卡罗来纳州少数民族参与联盟监督一名本科生,并将鼓励这名学生根据他们对这个项目的参与制定一篇高年级论文。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Willard Moore其他文献
Willard Moore的其他文献
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{{ truncateString('Willard Moore', 18)}}的其他基金
Collaborative Research: GEOTRACES Arctic Section: Radium and Thorium Isotopes as Natural Geochemical Tracers in the Arctic Ocean
合作研究:GEOTRACES 北极部分:镭和钍同位素作为北冰洋的天然地球化学示踪剂
- 批准号:
1458424 - 财政年份:2015
- 资助金额:
$ 11.3万 - 项目类别:
Continuing Grant
Collaborative Research: US GEOTRACES Pacific Zonal Transect: Rates of supply, removal and internal cycling of trace elements and isotopes
合作研究:美国 GEOTRACES 太平洋地带横断面:微量元素和同位素的供应、去除和内部循环率
- 批准号:
1231211 - 财政年份:2012
- 资助金额:
$ 11.3万 - 项目类别:
Continuing Grant
Collaborative Research: GEOTRACES Atlantic Section: Trace Element Sources and Sinks Elucidated by Short-Lived Radium and Thorium Isotopes
合作研究:GEOTRACES 大西洋部分:短命镭和钍同位素阐明的微量元素源和汇
- 批准号:
0926559 - 财政年份:2010
- 资助金额:
$ 11.3万 - 项目类别:
Standard Grant
Collaborative Research: GEOTRACES: Intercalibration exercise for Radium Isotopes in seawater
合作研究:GEOTRACES:海水中镭同位素的相互校准练习
- 批准号:
0751867 - 财政年份:2008
- 资助金额:
$ 11.3万 - 项目类别:
Standard Grant
Collaborative Research: Chemistry of Groundwater Transport Pathways Associated with a Coastal Lagoon System
合作研究:与沿海泻湖系统相关的地下水输送路径的化学
- 批准号:
0233657 - 财政年份:2003
- 资助金额:
$ 11.3万 - 项目类别:
Standard Grant
The Impact of Subsurface Fluid Advection on Coastal Ocean Chemistry
地下流体平流对沿海海洋化学的影响
- 批准号:
9712298 - 财政年份:1997
- 资助金额:
$ 11.3万 - 项目类别:
Continuing Grant
Ages of River Plumes and Freshened Coastal Waters Using Ra-224 and Ra-223
使用 Ra-224 和 Ra-223 测定河流羽流的年龄和新鲜的沿海水域
- 批准号:
9314587 - 财政年份:1993
- 资助金额:
$ 11.3万 - 项目类别:
Continuing Grant
Evaluating the Effects of High Particulate Fluxes on Chemical Processes Occurring at the Amazon River/Ocean Boundary
评估高颗粒通量对亚马逊河/海洋边界发生的化学过程的影响
- 批准号:
9116975 - 财政年份:1992
- 资助金额:
$ 11.3万 - 项目类别:
Continuing Grant
Chronology of Hydrothermal Vents, Juan de Fuca Ridge
胡安德富卡海岭热液喷口年代学
- 批准号:
9019300 - 财政年份:1991
- 资助金额:
$ 11.3万 - 项目类别:
Continuing Grant
Evaluating the Effects of High Particulate Fluxes on Chemi- cal Processes Occurring at the Amazon River/Ocean Boundary
评估高颗粒通量对亚马逊河/海洋边界发生的化学过程的影响
- 批准号:
8819579 - 财政年份:1989
- 资助金额:
$ 11.3万 - 项目类别:
Continuing Grant
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