Photodissolution of Sedimentary Organic Matter

沉积有机质的光溶解

• 批准号: 0623331
• 负责人: Lawrence Mayer
• 金额: $ 49.36万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0623331&HistoricalAwards=false
• 关键词: Photodissolution; Sedimentary; Organic; Matter

ABSTRACTOCE-0623331The field of marine photochemistry has previously focused on dissolved organic matter and trace metals. However, recent studies have shown that sediment suspensions in the ocean are also affected by sunlight and have the potential to dissolve most of their particulate organic carbon to the dissolved organic phase. A researcher from the University of Maine will determine the importance of photodissolution in the coastal Louisiana area, where riverine particulates are quickly deposited in shallow waters. Optical properties of the particulates will be examined to assess the photon fluxes and to determine the quantum yields of this photodissolution reaction. To determine the importance of this reaction, modeling of the turbid nearshore regimes, field-tests of the optical results, and developments of the markers from previous photodissolutions will be carried out. In addition to the optical properties of the particulates, the fate of the photodissolved organic matter will be assessed, addressing both photo-oxidation and biological mineralization reactions. In terms of the broader impacts, this research will provide new insights into the impact of photodegradation of particulate organic matter on the cycling of nutrients in the deltaic region of the Mississippi River. Outreach efforts based on the research activities at the K-12 and community level will be carried out. One graduate student and one undergraduate student will be supported and trained as part of the study.

海洋光化学领域以前主要关注溶解有机物和痕量金属。 然而，最近的研究表明，海洋中的沉积物悬浮液也会受到阳光的影响，并有可能将其大部分颗粒有机碳溶解到溶解有机相中。来自缅因州大学的一位研究人员将确定光溶解在路易斯安那州沿海地区的重要性，在那里，河流微粒迅速沉积在浅水沃茨。 将检查微粒的光学性质，以评估光子通量并确定该光溶解反应的量子产率。 为了确定这一反应的重要性，建模的混浊近岸制度，现场测试的光学结果，并从以前的光溶解标记的发展将进行。 除了颗粒物的光学特性外，还将评估光溶解有机物的命运，解决光氧化和生物矿化反应。就更广泛的影响而言，这项研究将为颗粒有机物的光降解对密西西比河三角洲地区营养物质循环的影响提供新的见解。 将在K-12和社区一级开展基于研究活动的外联工作。 作为研究的一部分，将支持和培训一名研究生和一名本科生。