The Lability of Riverine Particulate Organic Carbon Delivered to the Ocean

河流颗粒有机碳输送到海洋的稳定性

• 批准号: 0223383
• 负责人: Lawrence Mayer
• 金额: $ 29.4万
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0223383&HistoricalAwards=false
• 关键词: Lability; Riverine; Particulate; Organic; Carbon

The large annual flux of organic carbon from land to the ocean largely disappears in the sea. Reasons for this loss are not clear. Under this award, the PI will examine abiotic and biotic aspects of the lability to loss of riverine particulate organic matter. Work will focus on the Mississippi, as it demonstrates the clearest loss of particulate organic material of any North American river upon deposition in the ocean. Photochemical experiments will follow up on initial work showing significant dissolution of particulate organic matter subjected to solar levels of radiation. Interactions with metal cycling will be studied, as will a variety of other physicochemical variables. Biochemical lability will be explored via enzyme hydrolyses and bacterial incubations. Seasonal patterns will be examined, as will be the influence of deposition in freshwater environments.

从陆地到海洋的有机碳的每年大量通量在海洋中大部分消失。造成这种损失的原因尚不清楚。根据该奖项，PI将检查衰老侵蚀有机物的衰老的非生物和生物性方面。工作将重点放在密西西比州，因为它表明在海洋中沉积时，任何北美河流的颗粒有机材料损失最明显。光化学实验将跟进初始工作，显示受辐射太阳水平的颗粒有机物的显着溶解。将研究与金属循环的相互作用，以及各种其他物理化学变量。将通过酶水解和细菌孵育探索生化稳定性。将检查季节性模式，在淡水环境中沉积的影响也将被检查。