Collaborative research: Does dissolved organic matter influence the concentrations and distributions of trace elements in the Arctic Ocean?

合作研究：溶解有机物是否影响北冰洋微量元素的浓度和分布？

• 批准号: 1504469
• 负责人: Rainer Amon
• 金额: $ 39.99万
• 依托单位: Texas A&M University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1504469&HistoricalAwards=false
• 关键词: Collaborative; research; Does; dissolved; organic

The investigators propose to take advantage of three already-funded research expeditions to investigate the distribution of cycling of natural dissolved organic material (DOM) in the Arctic Ocean and in particular its relationship to the cycling of trace metals such as iron. The Arctic Ocean has experienced significant changes over the last 30 years, including declining sea ice and increasing continental runoff. The Arctic is considered a harbinger of changes in the carbon and hydrological cycles, with important implications for regional and global climate. How the physical, chemical and biological structure of the Arctic Ocean will respond to such fundamental changes is poorly understood. The proposed research will provide novel insights about dissolved organic matter and its role in trace element cycling. Recent studies provide tantalizing data indicating the transport and fate of DOM and trace metals are closely linked in the Arctic Ocean, and suggesting an important role of continental runoff and sea ice formation in the distribution of DOM and associated trace metals.Water samples will be collected and analyzed for dissolved organic carbon and nitrogen, amino acids, lignin phenols and detailed optical characterization of chromophoric DOM (CDOM) during 3 expeditions in 2015 aboard the USCGC Healy, the German ice breaker Polarstern, and the Japanese research vessel Mirai. The combined optical and molecular analyses will be used to distinguish and quantify terrigenous and marine DOM and their potential interactions with trace elements. A probe for measuring in situ fluorescence of DOM will be interfaced with the CTD/rosette for high-resolution mapping and real-time examination of interesting features to guide sampling efforts. The U.S. and German expeditions are part of the international GEOTRACES program, whose goals 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. The U.S. Arctic GEOTRACES project has established a central outreach program for this research program including meetings with local communities in Alaska, recruiting a high school teacher to participate in the expedition and interact with schools in the US and beyond via a blog. These investigators will tie into the existing GEOTRACES outreach efforts and will link interested Texas and South Carolina Schools to the expedition blog. This project will train 3 graduate students in and expose about 6 undergraduate students to research in the Arctic Ocean. The goal of the teaching component of this project is to provide students with an experience that demonstrates the scientific method, from development of goals and hypotheses to experimental design and presentation of results. Findings of this project will be conveyed to the public using established links with local newspapers where students describe research projects in their own words.

研究人员建议利用三项已资助的研究探险，以研究北极海洋中自然溶解有机材料（DOM）循环的分布，尤其是它与铁金属（如铁）的循环的关系。在过去的30年中，北极海洋经历了重大变化，包括海冰的下降和大陆径流的增加。北极被认为是碳和水文循环变化的预兆，对区域和全球气候具有重要意义。北极海洋的物理，化学和生物结构将如何应对这种基本变化。拟议的研究将提供有关溶解有机物及其在痕量元素循环中的作用的新见解。 Recent studies provide tantalizing data indicating the transport and fate of DOM and trace metals are closely linked in the Arctic Ocean, and suggesting an important role of continental runoff and sea ice formation in the distribution of DOM and associated trace metals.Water samples will be collected and analyzed for dissolved organic carbon and nitrogen, amino acids, lignin phenols and detailed optical characterization of chromophoric DOM (CDOM) during 3 2015年在USCGC Healy，德国破冰船Polarstern和日本研究船Mirai上进行探险。组合的光学和分子分析将用于区分和量化陆源和海洋DOM及其与微量元素的潜在相互作用。用于测量DOM原位荧光的探针将与CTD/玫瑰花结进，以进行高分辨率映射和实时检查有趣的特征以指导采样工作。美国和德国探险是国际地理计划计划的一部分，其目标是确定流程并量化控制海洋中关键的微量元素和同位素分布的通量，并确定这些分布对不断变化的环境条件的敏感性。美国北极Geotraces项目已为该研究计划建立了一项中央外展计划，包括与阿拉斯加当地社区的会议，招募一名高中老师参加探险活动，并通过博客与美国及其他地区的学校互动。这些调查人员将与现有的Geotraces外展工作联系起来，并将有兴趣的德克萨斯州和南卡罗来纳州学校与Expedition博客联系起来。该项目将培训3名研究生，并将约6名本科生在北极海洋中进行研究。该项目的教学组成部分的目的是为学生提供一种经验，这些经验展示了科学方法，从目标和假设到实验设计和结果表现。该项目的发现将通过与当地报纸建立的链接传达给公众，学生们用自己的话来描述研究项目。