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.

颗粒在微量元素和同位素 (TEI) 的循环和分布中发挥着重要作用。例如，清除颗粒并通过颗粒输出去除是许多 TEI 的主要汇。然而，影响 TEI 清除空间范围和时间变化的驱动因素仍然很大程度上未知。秘鲁和塔希提岛之间的美国 GEOTRACES 东太平洋地带横断面将穿越三个生物地球化学重要区域，为研究人员限制颗粒清除周围的未知因素奠定了基础。来自伍兹霍尔海洋研究所和明尼苏达大学双城分校的科学家将解决有关粒子形成位置、粒子溶解物种相互作用、主要粒子相以及传输过程中粒子相演化的基本问题。至于颗粒物相，研究人员将测量颗粒有机碳（POC）、碳酸钙、蛋白石、成岩物质和羟基氧化物，以及覆盖三个不同区域的尺寸分级颗粒的微量元素组成：大的横向生产力梯度、主要的氧秘鲁海岸附近的贫乏区，以及世界著名的东太平洋海隆南部喷发的热液羽流。此外，由于先前的结果表明颗粒类型影响清除，研究人员将专门测量可酸浸出的痕量金属、颗粒浓度和主要颗粒成分。这些综合测量将使他们能够理清热液颗粒、底栖霞云层和 TEI 清除的高生产率裕度的相对重要性。巡航横断面还将提供独特的机会来检查远离喷口场的热液颗粒中 Fe 和 POC 的形态，以及聚集和 POC 涂层对 TEI 分配的影响。至于更广泛的影响，研究人员计划创建一个关于海洋中颗粒微量金属的教育模块，该模块将成为由毕格罗海洋科学实验室的 Benjamin Twining 博士与海洋科学中心合作开发的由五部分组成的 GEOTRACES 网络研讨会系列的一部分。缅因大学海洋科学教育卓越-海洋系统。 作为该项目的一部分，伍兹霍尔海洋研究所的一名研究生和明尼苏达大学双城分校的一名研究生将得到支持和培训。 此外，一名本科生将在夏季参与这项研究，作为伍兹霍尔多样性倡议教育合作伙伴计划的一部分。