Organic Carbon Loading on Marine Sedimentary Particles as an Indicator of Modern and Ancient River Basin Weathering and Transport Regimes

海洋沉积颗粒的有机碳负荷作为现代和古代河流流域风化和运输机制的指标

• 批准号: 9809553
• 负责人: Elana Leithold
• 金额: $ 26.75万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9809553&HistoricalAwards=false
• 关键词: Organic; Carbon; Loading; Marine; Sedimentary

This project will examine the relation between clay-sized particles and the organic matter that is sorbed to them as they are transported through a river system (Eel River, California) and deposited on the continental shelf. Preliminary work indicates that during episodic floods, particles discharged by this river carry a smaller load of terrigenous organics to the marine environment than during nonflood periods. Analyses of the organic material (stable isotopes, C/N, molecular composition) and of clay particles (mineralogy, surface area) will be used to determine whether the amount of organic material associated with the clays is controlled by residence time of particles in the river, preferential erosion of deep soil horizons or rocks during periods of intense rainfall, or breakup of soil aggregates during turbulent transport. The results of this investigation will improve understanding of the controls on the amount of terrigenous carbon buried on continental margins, which play a primary role in the global carbon budget.

该项目将研究粘土大小的颗粒与吸附在它们上的有机物质之间的关系，因为它们通过河流系统（加州的鳗鱼河）运输并沉积在大陆架上。 初步工作表明，在情节洪水，颗粒排出这条河携带较小的负载陆源有机物的海洋环境比在非洪水期。 对有机物质（稳定同位素、C/N、分子组成）和粘土颗粒（矿物学、表面积）的分析将用于确定与粘土有关的有机物质的量是否受颗粒在河流中的停留时间、强降雨期间深层土壤层或岩石的优先侵蚀或湍流运输期间土壤团聚体的破碎的控制。 本次调查的结果将提高对大陆边缘埋藏的陆源碳量的控制的理解，这在全球碳收支中发挥着主要作用。