US GEOTRACES North Atlantic Section: Analysis of Key Trace Elements in Size-fractionated Marine Particles

美国 GEOTRACES 北大西洋部分：粒度分级海洋颗粒中关键微量元素的分析

• 批准号: 0963026
• 负责人: Phoebe Lam
• 金额: $ 30.79万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2013-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0963026&HistoricalAwards=false
• 关键词: US; GEOTRACES; North; Atlantic; Section

GEOTRACES is an international program to study the global marine biogeochemical cycles of trace elements and their isotopes (TEIs). Its guiding mission is to "identify processes and quantify fluxes that control the distributions of key trace elements and isotopes [TEIs] in the ocean" (GEOTRACES Science Plan, 2006). Because particles in the ocean serve as important sources and/or sinks for many trace elements and isotopes, particulate TEIs are key parameters for GEOTRACES. Indeed, the composition and distribution of particles in the ocean is crucial to understanding all three themes identified by the Science Plan: 1) Fluxes and processes at ocean interfaces, 2) Internal cycling, and 3) Development of proxies for past change. In this project, researchers at the Woods Hole Oceanographic Institution will be supported to ensure the collection of high quality trace metal clean size-fractionated particles on the US North Atlantic GEOTRACES Atlantic section and the analysis of key trace elements and major particulate phases. They will analyze size-fractionated particles collected by battery operated in-situ filtration for all key trace elements listed in the Science Plan (Fe, Al, Zn, Mn, Cd, Cu), a suite of other trace elements of interest (e.g. Co, Ti, Ba), and major carrier phases (e.g. CaCO3, biogenic Si, and POC). The operation of battery operated in-situ filtration (McLane pumps) for short-lived radionuclides is already funded for the Atlantic GEOTRACES section. This project will coordinate closely with the short-lived radionuclide group to adapt McLane pumps for simultaneous sampling of size-fractionated particles for trace metal analysis and radionuclide collection. Broader Impacts: Inasmuch as this will be the first full ocean depth zonal section of size-fractionated particulates, the result should be a novel and comprehensive understanding of the distribution, composition, and dynamics of the particles that control much of the chemical distribution, carbon uptake, and the biological productivity of the ocean. Because of the importance of particles in so many processes affecting the cycling of TEIs, this dataset will be invaluable in conjunction with other parameters measured on the GEOTRACES Atlantic section. Many as yet unposed scientific questions will emerge from this unprecedented dataset, which will be made available through publication and electronically through the BCO-DMO data office at Woods Hole so that it can be mined in the future by anyone in the community exploring questions about particle distribution and composition. A summer undergraduate student will help with some sample analyses, as will a graduate student in the MIT-WHOI Joint Program in Oceanography.

GEOTRACES是一个研究全球海洋微量元素及其同位素（TEIs）生物地球化学循环的国际项目。其指导任务是“确定控制海洋中关键微量元素和同位素分布的过程和量化通量”（GEOTRACES科学计划，2006年）。由于海洋中的颗粒是许多微量元素和同位素的重要来源和/或汇，因此颗粒tei是GEOTRACES的关键参数。事实上，海洋中颗粒的组成和分布对于理解科学计划确定的所有三个主题至关重要：1)海洋界面的通量和过程，2)内部循环，以及3)发展过去变化的代用物。在这个项目中，伍兹霍尔海洋研究所的研究人员将得到支持，以确保在美国北大西洋GEOTRACES大西洋剖面上收集高质量的痕量金属清洁尺寸分选颗粒，并分析关键微量元素和主要颗粒相。他们将分析由电池操作的原位过滤收集的大小分级颗粒，以获取科学计划中列出的所有关键微量元素（Fe, Al, Zn, Mn, Cd, Cu），一系列其他感兴趣的微量元素（例如Co， Ti, Ba）和主要载体相（例如CaCO3，生物硅和POC）。对于短寿命放射性核素，电池驱动的原位过滤（麦克莱恩泵）的操作已经为大西洋GEOTRACES部分提供了资金。该项目将与短寿命放射性核素组密切协调，使麦克莱恩泵能够同时采样大小分级颗粒，用于痕量金属分析和放射性核素收集。更广泛的影响：由于这将是第一个完整的海洋深度分区颗粒的大小分级，结果应该是对控制大部分化学分布，碳吸收和海洋生物生产力的颗粒的分布，组成和动力学的新颖和全面的理解。由于粒子在影响tei循环的许多过程中的重要性，该数据集与GEOTRACES大西洋剖面测量的其他参数相结合将是非常宝贵的。许多尚未解决的科学问题将从这个前所未有的数据集中出现，这些数据集将通过出版物和电子方式通过伍兹霍尔的BCO-DMO数据办公室提供，以便将来社区中的任何人都可以探索有关颗粒分布和组成的问题。一名夏季本科生将帮助进行一些样本分析，麻省理工学院-世界卫生组织海洋学联合项目的研究生也将提供帮助。