Collaborative Research: GEOTRACES Arctic Section: The Geochemistry Size-fractionated Suspended Particles Collected by in-situ Filtration

合作研究：GEOTRACES 北极部分：通过原位过滤收集的地球化学尺寸分级悬浮颗粒

• 批准号: 1535854
• 负责人: Phoebe Lam
• 金额: $ 52.06万
• 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: 2015
• 资助国家: 美国
• 起止时间: 2015-02-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1535854&HistoricalAwards=false
• 关键词: Collaborative; Research; GEOTRACES; Arctic; Section

An investigator from Woods Hole Oceanographic Institution participating in the 2015 U.S. GEOTRACES Arctic expedition will collect and analyze suspended particulate matter in the Western Arctic Ocean to better understand cycling of trace elements in the region. In common with other multinational initiatives in the International GEOTRACES Program, the goals of the U.S. Arctic expedition are to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions. Some trace elements are essential to life, others are known biological toxins, and still others are important because they can be used as tracers of a variety of physical, chemical, and biological processes in the sea. Particles are a key parameter for the GEOTRACES program because of their role as sources, sinks, and in the cycling of trace elements. Results from this study will be shared through outreach to native groups in Alaska. The project will involve training of graduate and undergraduate students.Particle cycling in the Arctic Ocean is profoundly different from other ocean basins. Extremely low primary production in the perennially ice-covered central Arctic leads to a very weak biological pump. With little particle flux coming from above, the dominant source of particles to the Arctic Basin appears to be lateral transport from the margins, and these laterally transported particles have much higher lithogenic content than is typically found in particles in other ocean basins. The different source and composition of particles in the Arctic potentially sets up a completely different dynamic for the removal of particle-reactive trace elements and their isotopes from the water column than is currently understood. There has yet to be a comprehensive survey of the concentration and composition of suspended particles in the Arctic. In this study, the size-fractionated suspended particles will be analyzed for major phases and trace element composition, measurements needed to determine scavenging removal of particle reactive elements and provide insight into the mechanisms controlling the biological pump.

伍兹霍尔海洋研究所的一名调查员参加了2015年美国地理痕迹北极考察，他将收集和分析北冰洋西部的悬浮颗粒物，以更好地了解该地区痕量元素的循环。与国际地质勘测计划中的其他多国倡议一样，美国北极探险的目标是确定控制海洋中关键微量元素和同位素分布的过程和通量，并确定这些分布对不断变化的环境条件的敏感性。一些微量元素对生命是必不可少的，另一些是已知的生物毒素，还有一些很重要，因为它们可以用作海洋中各种物理、化学和生物过程的示踪剂。粒子是GEOTRACES计划的一个关键参数，因为它们作为源、汇和痕量元素循环的角色。这项研究的结果将通过接触阿拉斯加的土著群体来分享。该项目将涉及研究生和本科生的培训。北冰洋的粒子自行车与其他大洋盆地有很大的不同。在常年被冰覆盖的北极中部，初级生产量极低，导致生物泵非常薄弱。由于来自上方的颗粒通量很少，进入北极盆地的颗粒的主要来源似乎是从边缘横向输送的，这些横向输送的颗粒具有比其他大洋盆地颗粒通常存在的更高的成岩含量。北极不同的颗粒物来源和组成可能为从水柱中清除具有颗粒物活性的痕量元素及其同位素建立了一个与目前所了解的完全不同的动态。目前尚未对北极悬浮粒子的浓度和组成进行全面调查。在这项研究中，将对粒度分级的悬浮颗粒进行主要物相和微量元素组成的分析，以确定颗粒反应元素的清除去除，并提供对生物泵控制机制的洞察。