Collaborative Research: US GEOTRACES GP17-OCE: Shipboard Measurements of Dissolved Aluminum, Iron, and Manganese – Tracing Inputs to the South Pacific Gyre and Southern Ocean

合作研究：美国 GEOTRACES GP17-OCE：溶解铝、铁和锰的船上测量 — 追踪南太平洋环流和南大洋的输入

• 批准号: 2123623
• 负责人: Peter Sedwick
• 金额: $ 33.77万
• 依托单位: Old Dominion University Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2123623&HistoricalAwards=false
• 关键词: Collaborative; Research; US; GEOTRACES; GP17

The goal of the international research program GEOTRACES is to understand the distributions of trace chemical elements and their isotopes in the oceans. The importance of trace elements in the ocean lies in their roles as essential micronutrients for marine phytoplankton (e.g., iron), as toxicants (e.g., lead), and as tracers of past and present oceanic processes (e.g., thorium). In this project, the dissolved concentrations of two micronutrient trace elements (iron and manganese) and a tracer of atmospheric dust deposition (aluminum) will be measured in seawater samples collected during a research cruise in the southeastern Pacific Ocean and adjacent Southern Ocean, in order to better understand the inputs of these micronutrients and their impact on biological processes in these regions. Chemical analyses will be performed at sea in near real-time, thus providing a first glimpse of data that will inform the cruise sampling strategy and the analyses performed by other investigators. The project involves two US laboratories, and will support the research of a graduate and undergraduate student. The U.S. GEOTRACES GP17-OCE expedition will focus on the distribution of trace elements and isotopes along a transect crossing the South Pacific Gyre and the Pacific sector of the Southern Ocean, where the supply of dissolved iron (DFe) and manganese (DMn) to the surface ocean is thought to regulate primary production and associated cycling of carbon and nutrient elements. The investigators will undertake shipboard and post-cruise measurements of dissolved aluminum (DAl), DFe and DMn in order to constrain (1) the magnitude of dust deposition to this ocean region and the fidelity of DAl and DMn as tracers of aeolian iron inputs; (2) the origin of deep-ocean DAl and DFe anomalies, and their implications for deep sources of these elements; and (3) the source and fate of hydrothermal DFe emissions from the deep ocean and their role in supporting Southern Ocean primary production. Project results, complemented by measurements of other trace chemical species made by collaborators on GP17-OCE, will advance the understanding of the processes that control the oceanic inventories and distributions of DAl, DFe and DMn, and their trajectories of future change.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

国际研究计划的目标是了解痕量化学元素及其同位素在海洋中的分布。海洋中痕量因素的重要性在于它们作为海洋浮游植物（例如铁），有毒物质（例如铅）的必要微量营养素的作用，也是过去和现在的海洋过程（例如thorium）的示踪剂。在该项目中，将在东南太平洋和邻近南部海洋研究期间收集的两个微量营养素痕量元素（铁和锰）和大气尘埃沉积（铝）的溶解浓度进行测量，以便更好地了解这些微生物和对这些微生物的影响，以便更好地了解这些微生物和对这些微生物的影响。 化学分析将在接近实时的海上进行，从而提供了第一次了解数据，这些数据将为巡航采样策略和其他研究人员进行的分析提供信息。该项目涉及两个美国实验室，并将支持研究生和本科生的研究。美国的地理环境GP17-OCE探险将集中于沿横断南太平洋Gyre和南大洋太平洋地区的横向元素和同位素的分布，在那里溶解的铁（DFE）和锰（DMN）向地面海洋的供应被认为可以调节初级生产和相关的碳和营养元素。研究人员将对溶解的铝（DAL），DFE和DMN进行船上和疏s的测量，以限制（1）尘埃沉积的幅度（1）DAL和DMN作为Aeolian Iron Intupts的示踪剂的粉尘沉积幅度； （2）深海洋DAL和DFE异常的起源及其对这些元素的深层来源的影响； （3）深海的水热DFE排放的来源和命运及其在支持南方海洋初级生产中的作用。项目结果是对合作者对GP17-OCE进行的其他痕量化学物种的测量的补充，将提高对控制DAL，DFE和DMN的海洋清单和分布的过程的理解，及其未来变化的轨迹。该奖项反映了NSF的法定任务，并通过评估了基金会的范围，并通过评估了基金会的MERIT和FRODINAIL和FORGIATIAL和FORGITIAL的支持。