A Sediment Trap Study to Determine if the Flux of Silver to the Seafloor is Related to Export Productivity

沉积物捕集器研究以确定流入海底的银通量是否与出口生产率相关

• 批准号: 1234465
• 负责人: Jennifer McKay
• 金额: $ 33.54万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-12-01 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1234465&HistoricalAwards=false
• 关键词: Sediment; Trap; Study; Determine; Flux

Intellectual Merit: Since work conducted in the early 1980's, there has been a growing interest in improving our understanding of the relationship between the particle flux of Ag and export productivity in the ocean. Despite tantalizing positive correlations between sedimentary Ag and more traditional paleoproxies, such as organic carbon, opal and biogenic Ba, there has yet to be a comprehensive study undertaken to evaluate in detail the relationship between the flux of particulate Ag and export productivity in the ocean. If the sinking flux of Ag can be shown to reliably track export productivity, as will be evaluated in this study, then the geochemical community will have a new tracer to provide important new insights and constraints on past changes in paleoproductivity. In particular, this project will test the hypothesis that Ag can be used to trace the flux of biogenic particulate organic matter exported from the surface ocean to the sediments; furthermore, this project will evaluate the potential use of Ag as a proxy tracer of past changes in productivity. A secondary objective is to determine whether sedimentary redox conditions affect the accumulation of Ag in sediments. This work will be accomplished by analysis of Ag in a suite of archived sediment trap and sediment samples collected from a range of oceanographic locations. The data obtained from this research will aid in the development of a new paleoproductivity proxy (Ag) that can be utilized to improve paleoceanographic reconstructions. Broader Impacts: In regards to broader impacts, this research will provide the scientific community with a better understanding of the biogeochemical cycling of Ag, an element that is toxic to marine organisms, as well as the cycling of redox-sensitive trace metals. The study will support an early scientist, and provide training for one graduate student and two undergraduate students.

智力价值：自 20 世纪 80 年代初开展工作以来，人们对提高我们对 Ag 粒子通量与海洋出口生产力之间关系的理解越来越感兴趣。尽管沉积物银与有机碳、蛋白石和生物Ba等更传统的古替代物之间存在诱人的正相关性，但尚未开展全面的研究来详细评估颗粒物银的通量与海洋出口生产力之间的关系。如果银的沉没通量能够可靠地跟踪出口生产力，正如本研究将评估的那样，那么地球化学界将拥有一种新的示踪剂，为古生产力过去的变化提供重要的新见解和约束。 特别是，该项目将测试以下假设：Ag 可用于追踪从表层海洋输出到沉积物的生物颗粒有机物的通量；此外，该项目将评估 Ag 作为过去生产力变化的代理追踪器的潜在用途。第二个目标是确定沉积氧化还原条件是否影响沉积物中银的积累。这项工作将通过对一套存档的沉积物收集器中的银进行分析以及从一系列海洋地点收集的沉积物样本来完成。从这项研究中获得的数据将有助于开发一种新的古生产力代理（Ag），可用于改进古海洋学重建。更广泛的影响：就更广泛的影响而言，这项研究将使科学界更好地了解银（一种对海洋生物有毒的元素）的生物地球化学循环，以及氧化还原敏感的微量金属的循环。 该研究将为一名早期科学家提供支持，并为一名研究生和两名本科生提供培训。