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: 0713991
• 负责人: Rainer Amon
• 金额: $ 45.26万
• 依托单位: Texas A&M 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 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0713991&HistoricalAwards=false
• 关键词: Collaborative; research; Chromophoric; dissolved; organic

Amon 0713991Texas A&M University - GalvestonFunds 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.

美国德州农工大学加尔维斯顿分校提供的资金用于研究陆源有机质的分布及其荧光特性，以提高对北极盐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。假设1：陆源溶解有机质（DOM）和显色性溶解有机质（CDOM）是河水的敏感示踪剂，携带着其他淡水示踪剂（如盐度、碱度、钡、d18O）不易获得的独特来源信息，特别是在加拿大盆地。假设2：陆源DOM和CDOM主要在海冰形成和盐水排出过程中注入地表混合层以下，是北极盐跃水通风的有用示踪剂。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。（他们相信，详细的荧光分析将使他们能够区分不同的来源，并为未来开发更具体的原位探针。）假设4:DOM中木质素酚的大小分布提供了北极陆源DOM分解程度的定性指标。北冰洋的淡水收支及其在年代际和更长时间尺度上的变率可能对全球海洋环流产生重要影响，例如对经向翻转环流和气候的调节。该项目将为研究和洞察从世界上一些主要河流系统排放到北冰洋的淡水的途径和命运提供工具。