U.S. GEOTRACES North Atlantic Section: The chemical speciation of dissolved iron and copper

美国 GEOTRACES 北大西洋剖面：溶解铁和铜的化学形态

• 批准号: 0927453
• 负责人: Kristen Buck
• 金额: $ 29.98万
• 依托单位: Bermuda Institute of Ocean Sciences (BIOS), Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-03-01 至 2014-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0927453&HistoricalAwards=false
• 关键词: U.S.; GEOTRACES; North; Atlantic; Section

GEOTRACES is a newly initiated international oceanographic program to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the oceans and to establish an understanding of the sensitivity of these distributions to changing environmental conditions. During the GEOTRACES cruise to the North Atlantic basin in 2010, a scientist from the Bermuda Institute of Ocean Sciences will focus on characterizing the organic complexation of dissolved iron (Fe) in the water column. Iron is typically 99% complexed by strong organic ligands in the marine environment making these ligands a crucial component of the biogeochemical cycling of this element. The specific goals of the proposed work are the following: (1) determine the distributions of strong Fe-binding organic ligands and the sources of variability in the relationship between strong ligand and dissolved Fe concentrations in the proposed hydrographic regions; (2) inter-compare shipboard and laboratory-based speciation analyses with those of other analysts as well as with published field data; and (3) assess any apparent contributions of aeolian deposition to changes in dissolved Fe-binding organic ligand concentrations in surface waters. As regards broader impacts, results from this study would provide much-needed field data for future modeling endeavors. The outreach component of the study was truly impressive and includes the production of an radio segment from 'Our Ocean World' that highlight research finding from this study and the collaboration with high school teachers to develop lesson plans containing both hands-on experiments related to the project.

GeoTraces是一个新发起的国际海洋学方案，目的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，并建立对这些分布对不断变化的环境条件的敏感性的理解。在2010年前往北大西洋盆地的GEOTRACES邮轮期间，百慕大海洋科学研究所的一名科学家将重点研究水柱中溶解铁(Fe)的有机络合作用。在海洋环境中，铁通常99%被强的有机配体络合，使这些配体成为这种元素生物地球化学循环的关键组成部分。拟议工作的具体目标如下：(1)确定拟议水文区域内与铁结合的强有机配体的分布以及强配体与溶解铁浓度之间关系的变异性来源；(2)将船上和实验室的形态分析与其他分析员的分析结果以及已公布的现场数据进行相互比较；以及(3)评估风沙沉积对表层水中与铁结合的有机配体浓度变化的任何明显贡献。至于更广泛的影响，这项研究的结果将为未来的建模工作提供急需的现场数据。这项研究的外展部分确实令人印象深刻，包括从《我们的海洋世界》中制作了一个广播片段，突出了这项研究的研究成果，并与高中教师合作制定了包含与该项目相关的动手实验的教案。