Collaborative Research:US GEOTRACES Pacific Zonal Transect: Rates of supply, removal and internal cycling of trace elements and isotopes

合作研究：US 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: 1232669
• 负责人: Ken Buesseler
• 金额: $ 110万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-12-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1232669&HistoricalAwards=false
• 关键词: Collaborative; Research; US; GEOTRACES; Pacific

The goal of GEOTRACES is to identify processes and quantify fluxes that control the distribution of trace elements and isotopes (TEIs) in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions. While the distribution of numerous TEIs will be mapped by a large team of GEOTRACES PIs along this transect, their distribution cannot be properly interpreted without concurrent measurement of tracers capable of providing rates of internal TEI cycling processes and fluxes at boundaries and across interfaces. Naturally-occurring radioisotopes of the Uranium-Thorium series are well suited for studying the sources and sinks of TEIs on time and space scales necessary to interpret lateral and vertical TEI distributions. In this project, a research team from the Woods Hole Oceanographic Institution and the University of South Carolina at Columbia will carry out measurement of a suite of uranium/thorium series radionuclides on the US GEOTRACES cruise to the Eastern Tropical South Pacific (ETSP) Ocean. This radiotracer suite will include shorter-lived 234Th and 228Th as well as the radium quartet (224Ra, 223Ra, 228Ra, 226Ra), which together allow the quantification of rates of horizontal and vertical transport and mixing, as well as removal at ocean boundaries, surface export, and subsurface remineralization. Broader Impacts: The PIs have actively involved undergraduate and high school students in their prior NSF-funded projects, with two having won awards at ASLO meetings in recent years. The trend will continue with this effort, along with the inclusion of an international guest student who will work on analytical improvements for measuring particulate 228Th. In addition, two WHOI-MIT Joint Program students will be involved using this project as a major part of their PhD theses on Th and Ra isotopes. Contributions to the data management side of the results from these 6 isotopes is eagerly awaited by the modeling community, where there is a lack of multiple thorium isotope data sets on these basin scales for parameterization of the cycling of all particle reactive and biologically active TEIs.

GEOTRACES的目标是确定控制海洋中微量元素和同位素（TEIs）分布的过程和量化通量，并确定这些分布对不断变化的环境条件的敏感性。虽然许多TEI的分布将由一个大型GEOTRACES pi团队沿着该样带绘制，但如果不同时测量能够提供内部TEI循环过程速率和边界和跨界面通量的示踪剂，则无法正确解释其分布。天然存在的铀-钍系列放射性同位素非常适合在时间和空间尺度上研究TEI的源和汇，这是解释TEI横向和垂直分布所必需的。在这个项目中，来自伍兹霍尔海洋研究所和南卡罗来纳大学哥伦比亚分校的一个研究小组将在美国GEOTRACES巡航到东热带南太平洋（ETSP）海洋上对一套铀/钍系列放射性核素进行测量。该放射性示踪剂套件将包括寿命较短的234和228Th以及镭四重奏（224Ra, 223Ra, 228Ra, 226Ra），它们一起可以量化水平和垂直运输和混合的速率，以及海洋边界的移除，地表出口和地下再矿化。更广泛的影响：pi在他们之前的nsf资助项目中积极地让本科生和高中生参与其中，其中两个在近年来的ASLO会议上获得了奖项。随着这一努力的进行，这一趋势将继续下去，同时还将有一名国际客座学生加入，他将致力于改进测量微粒228Th的分析方法。此外，两名WHOI-MIT联合项目的学生将参与其中，将该项目作为其Th和Ra同位素博士论文的主要部分。建模界迫切期待对这6种同位素结果的数据管理方面的贡献，因为在这些盆地尺度上缺乏多个钍同位素数据集，用于参数化所有颗粒活性和生物活性TEIs的循环。