Collaborative Research: GEOTRACES Pacific Section: The Geochemistry of Size-fractionated Suspended Particles Collected by In-situ Filtration

合作研究：GEOTRACES 太平洋部分：原位过滤收集的尺寸分级悬浮颗粒的地球化学

• 批准号: 1518110
• 负责人: Phoebe Lam
• 金额: $ 20.34万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-11-06 至 2017-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1518110&HistoricalAwards=false
• 关键词: Collaborative; Research; GEOTRACES; Pacific; Section

Particles play essential roles in the cycling and distribution of trace elements and isotopes (TEI). For instance scavenging onto particles and removal by particle export is a major sink for many TEIs. However the driving factors affecting the spatial extent and temporal variability of TEI scavenging remain largely unknown. The U.S. GEOTRACES East Pacific Zonal Transect between Peru and Tahiti will cross three biogeochemically important areas, setting the stage for researchers to constrain unknowns surrounding particle scavenging. Scientists from Woods Hole Oceanographic Institution and University of Minnesota-Twin Cities will address fundamental questions on the location of particle formation, particle-dissolved species interactions, dominant particle phases, and the evolution of particle phases during transport. As regards particle phases, the researchers will measure particulate organic carbon (POC), calcium carbonate, opal, lithogenics, and oxyhydroxides, as well as the trace element compositions of size fractionated particles covering three distinct zones: large lateral productivity gradients, a major oxygen deficient zone off the coast of Peru, and a world renowned hydrothermal plume emanating from the southern East Pacific Rise. Furthermore, since previous results suggest particle type affects scavenging, investigators will specifically measure acid-leachable trace metals, particle concentration, and major particle composition. These combined measurements will allow them to disentangle the relative importance of hydrothermal particles, benthic nepheloid layers, and high productivity margins for scavenging of TEIs. The cruise transect will also offer unique opportunities to examine the speciation of Fe and POC in hydrothermal particles away from the vent field and the effects of aggregation and POC coatings on TEI partitioning. As regards broader impacts, the researchers plan to create an educational module on particulate trace metals in the ocean which would become part of a five part GEOTRACES webinar series developed by Dr. Benjamin Twining at the Bigelow Laboratory for Ocean Sciences in collaboration with the Center for Ocean Sciences Education Excellence-Ocean Systems at the University of Maine. One graduate student from Woods Hole Oceanographic Institution and one graduate student from the University of Minnesota, Twin Cities, would be supported and trained as part of this project. In addition, an undergraduate student would participate in the research during the summer month as part of the Woods Hole Diversity Initiative Partnership in Education program.

颗粒在痕量元素和同位素（TEI）的循环和分布中起着重要作用。例如，清除颗粒上的颗粒和粒子出口去除是许多TEI的主要水槽。但是，影响TEI清除的空间范围和时间变化的驱动因素仍然很大未知。秘鲁和大溪地之间的东太平洋区域区域将跨越三个重要的地区，为研究人员限制围绕粒子清除的未知数奠定了基础。来自伍兹洞海洋学机构和明尼苏达大学两国城市的科学家将解决有关颗粒形成的位置，粒子溶解的物种相互作用，主要粒子相以及运输过程中粒子相的演变的基本问题。 As regards particle phases, the researchers will measure particulate organic carbon (POC), calcium carbonate, opal, lithogenics, and oxyhydroxides, as well as the trace element compositions of size fractionated particles covering three distinct zones: large lateral productivity gradients, a major oxygen deficient zone off the coast of Peru, and a world renowned hydrothermal plume emanating from the southern East Pacific Rise.此外，由于先前的结果表明颗粒类型会影响清除，因此研究人员将特别测量可氯化的痕量金属，颗粒浓度和主要颗粒组成。这些合并的测量结果将使它们能够解散水热颗粒，底栖肾上腺层和高生产率边缘的相对重要性，以清除TEIS。巡航样带还将提供独特的机会，以检查远离排气场的水热颗粒中Fe和POC的形态，以及聚集和POC涂料对TEI分配的影响。关于更大的影响，研究人员计划在海洋中建立一个教育模块，该模块是由Benjamin Twining博士在Bigelow海洋科学实验室与Bigelow海洋科学实验室合作开发的五部分地理位置网络研讨会系列的一部分，该系列与Maine大学的卓越海洋科学教育系统合作。 一名来自Woods Hole海洋学机构的研究生，明尼苏达大学双城的一名研究生将作为该项目的一部分进行支持和培训。 此外，作为伍兹洞多样性倡议计划的教育计划的一部分，一名本科生将在夏季参加研究。