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.

参加2015年美国北极探险队的伍兹孔海洋学机构的研究人员将收集和分析西部北极海洋中悬浮的颗粒物，以更好地了解该地区痕量元素的循环。美国北极探险队的目标是与国际地理计划计划中的其他跨国公司计划相同，是确定过程并量化流量，以控制海洋中关键的微量元素和同位素的分布，并确定这些分布对不断变化环境条件的敏感性。一些痕量元素对生命至关重要，另一些是已知的生物毒素，而另一些则很重要，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程序的关键参数，因为它们是量子元素的源，下沉和循环中的作用。这项研究的结果将通过宣传与阿拉斯加的本土群体共享。该项目将涉及培训研究生和本科生。北极海洋中的粒子骑自行车与其他海洋盆地有很大不同。多年生冰覆盖的中央北极产量极低的初级产量导致非常弱的生物泵。由于从上方几乎没有粒子通量，北极盆地的主要颗粒来源似乎是从边缘的横向转运，并且这些侧向转运的颗粒具有比其他海洋盆地颗粒中通常发现的岩性含量要高得多。北极中颗粒的不同源和组成可能建立了完全不同的动态，用于去除粒子反应性痕量元件及其同位素从水柱中的去除，而不是当前所知。尚未对北极悬浮颗粒的浓度和组成进行全面调查。 在这项研究中，将分析大小分级的悬浮颗粒的主要阶段和痕量元素组成，确定清除颗粒反应性元件所需的测量值，并提供对控制生物泵的机制的见解。