COLLABORATIVE RESEARCH: IMPACT OF DOM SOURCE AND PHOTOOXIDATION ON CARBON CYCLING IN ESTUARIES

合作研究：DOM 源和光氧化对河口碳循环的影响

• 批准号: 0327446
• 负责人: Kenneth Mopper
• 金额: $ 55.05万
• 依托单位: Old Dominion University Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-01 至 2008-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0327446&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; IMPACT; DOM; SOURCE

ABSTRACTOCE-0327423OCE-0327446Without understanding the type, magnitude and time scale over with dissolved organic matter (DOM) gets modified in rivers and estuaries, the regional and global delivery of total dissolved organic matter delivered to the ocean and its chemical and isotopic signatures will be poorly constrained. For this reason, scientists from the Virginia Institute of Marine Science and Old Dominion University plan to carry out a multi-technique approach to determine the photochemical and microbial processes that control the structural alteration and terminal oxidative losses of total dissolved organic matter (TDOM) during its residence in the York and Delaware River estuarine systems. These two temperate estuaries are characterized by different total dissolved organic matter ages and sources. Utilizing photochemical (i.e., irradiation), stable and radio-isotopic, structural tools (i.e., 13C-NMR) and bacterial degradation experiments, the PIs will evaluate how the photochemical and microbial processes mechanistically impact the qualitative and quantitative nature of TDOM export and how photochemical reactivity of estuarine DOM is changed by riverine source age, composition and photo-oxidation/photobleaching.

如果不了解溶解有机物（DOM）在河流和河口中发生变化的类型、大小和时间尺度，则区域和全球向海洋输送的总溶解有机物及其化学和同位素特征将受到很大的限制。 出于这个原因，来自弗吉尼亚海洋科学研究所和老自治领大学的科学家计划进行多技术方法，以确定控制结构变化和总溶解有机物（TDOM）的终端氧化损失的光化学和微生物过程，在其居住在约克和特拉华州河口系统。 这两个温带河口具有不同的溶解有机质年龄和来源。 利用光化学（即，辐射），稳定的和放射性同位素，结构工具（即，13 C-NMR）和细菌降解实验，PI将评估光化学和微生物过程如何在机械上影响TDOM输出的定性和定量性质，以及河口DOM的光化学反应性如何因河流源年龄、成分和光氧化/光漂白而改变。