Collaborative Research: U.S. GEOTRACES Pacific Section: Analysis of 230Th, 232Th and 231Pa

合作研究：美国 GEOTRACES 太平洋部分：230Th、232Th 和 231Pa 分析

• 批准号: 1233903
• 负责人: Richard Edwards
• 金额: $ 41万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1233903&HistoricalAwards=false
• 关键词: Collaborative; Research; U.S.; GEOTRACES; Pacific

The International GEOTRACES program is a multi-national effort to survey (by a series of cross-ocean sections) and understand the global-ocean distribution of trace elements and isotopes in seawater. The GEOTRACES Science Plan has designated the natural radioisotopes 231Pa and 230Th to be key parameters inasmuch as their measurement on all sections is deemed to be critical to the success of entire international ocean science programIn this project, a research team from the Lamont- Doherty Earth Observatory of Columbia University and the University of Minnesota - Twin Cities will undertake measurement of the dissolved and particulate concentrations of 230Th and 231Pa on the US GEOTRACES Peru-Tahiti section, one of the American contributions to the global GEOTRACES effort. Additionally, they will measure dissolved and particulate 232Th concentrations and analyze a limited number of aerosol samples, aerosol leachates, and surface sediments for these radionuclides. These data will be used to: 1) Quantify the rates of boundary scavenging of 231Pa and 230Th associated with the biologically productive Peru upwelling system, 2) Quantify the rates of bottom scavenging of 231Pa and 230Th thought to be associated with resuspended sediments in nepheloid layers, 3) Quantify the uptake of dissolved Th and Pa by metalliferous particles associated with the hydrothermal plume emanating from the East Pacific Rise as well as by authigenic particles formed within the oxygen minimum zone, 4) Quantify the supply of lithogenic 232Th from margin sediments by the combined study of 232Th and 230Th, and 5) Quantify the supply of lithogenic 232Th from aerosols by the combined study of 232Th and 230Th. Through collaboration with other US GEOTRACES investigators, the team expects that this work will provide unprecedented constraints on the processes that supply trace elements to the ocean as well as the processes that remove them. Broader Impacts. The project will provide for the training and support of a postdoctoral research associate and one graduate student.

国际地理领域计划是一项跨国努力（通过一系列跨海部分），并了解海水中痕量元素和同位素的全球海洋分布。 The GEOTRACES Science Plan has designated the natural radioisotopes 231Pa and 230Th to be key parameters inasmuch as their measurement on all sections is deemed to be critical to the success of entire international ocean science programIn this project, a research team from the Lamont- Doherty Earth Observatory of Columbia University and the University of Minnesota - Twin Cities will undertake measurement of the dissolved and particulate concentrations of美国地理塔希提（Peru-Tahiti）的第230和231PA部分，这是美国对全球地理努力的贡献之一。 此外，它们将测量溶解和颗粒的第232个浓度，并分析这些放射性核素的数量有限的气溶胶样品，气溶胶渗滤液和表面沉积物。 这些数据将用于：1）量化与生物生产的秘鲁上升系统相关的231Pa和第230个边界清除率，2）量化底部清除231pa的底部清除率，被认为与肾上腺液体中的液体相关的pa和pa相关的pa量相关的231 pa和第230次被认为与静脉相关的沉积物相关，3）从东太平洋的上升以及通过在氧最小区域内形成的身份颗粒，4）通过通过232和230th的合并研究来量化岩性232的供应，以及5）量化了232th和230th的合并研究，量化了岩性232的供应。通过与其他美国地理领域的调查人员的合作，该团队预计这项工作将为向海洋提供跟踪元素以及删除它们的过程提供前所未有的约束。更广泛的影响。 该项目将提供博士后研究助理和一名研究生的培训和支持。