Collaborative research: Chromophoric dissolved organic matter (CDOM) and lignin phenols as tracers of water masses and biogeochemical processes in the Arctic Ocean

合作研究：发色溶解有机物（CDOM）和木质素酚作为北冰洋水团和生物地球化学过程的示踪剂

• 批准号: 0713915
• 负责人: Ronald Benner
• 金额: $ 29.27万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0713915&HistoricalAwards=false
• 关键词: Collaborative; research; Chromophoric; dissolved; organic

Benner 0713915University of South CarolinaFunds are provided to investigate the distribution of terrigenous organic matter and its fluorescent properties to improve understanding of ventilation processes in the Arctic halocline as well as the physical, biological, and photochemical fluxes of terrigenous organic carbon in the Arctic Ocean. The principal investigators propose a series of hypotheses for testing:Hypothesis 1: Terrigenous dissolved organic matter (DOM) and chromophoric dissolved organic matter (CDOM) are sensitive tracers of river water that carry unique source information that is not readily available with other freshwater tracers (e.g. salinity, alkalinity, barium, d18O), especially in the Canada Basin.Hypothesis 2: Terrigenous DOM and CDOM are primarily injected below the surface mixed layer during sea-ice formation and brine rejection and are useful tracers of the ventilation of Arctic halocline waters.Hypothesis 3: The Arctic halocline is a multilayer system with each layer having distinct origins. (They believe that detailed fluorescence analyses will allow them to distinguish the different origins and develop more specific in situ probes for the future.)Hypothesis 4: The size distribution of lignin phenols in DOM provides a qualitative index of the extent of decomposition of terrigenous DOM in the Arctic.The freshwater budget of the Arctic Ocean, and its variability of decadal time scales and longer, has the potential for important impacts on global ocean circulation, such as modulation of the meridional overturning circulation, and climate. This project will provide tools for the study of and insights into the pathways and fate of freshwater discharged into the Arctic Ocean from some of the world's major river systems.

Benner 0713915南卡罗来纳大学提供资金调查陆源有机物的分布及其荧光特性，以提高对北极盐跃层通风过程以及北冰洋陆源有机碳的物理，生物和光化学通量的理解。 主要研究者提出了一系列假设进行检验：假设1：陆源溶解有机物（DOM）和发色溶解有机物（CDOM）是河流水的敏感示踪剂，携带着其他淡水示踪剂不容易获得的独特来源信息（如盐度、碱度、钡、d18O），特别是在加拿大海盆。假设2：陆源DOM和CDOM主要在海冰形成和盐水排斥期间注入到表面混合层以下，是北极盐跃层沃茨通风的有用示踪剂。假设3：北极盐跃层是一个多层系统，每一层都有不同的起源。(They相信详细的荧光分析将使他们能够区分不同的来源，并为未来开发更特异的原位探针。假设四：DOM中木质素酚类物质的粒径分布提供了一个定性指标，反映了北冰洋陆源DOM的分解程度。北冰洋的淡水收支及其年代际和更长时间尺度的变化，对全球海洋环流（如北极翻转环流的调制）和气候具有潜在的重要影响。 该项目将为研究和深入了解世界上一些主要河流系统排入北冰洋的淡水的路径和归宿提供工具。