Biogeochemical Cycling in the Organic-Rich Coastal Environment

富含有机物的沿海环境中的生物地球化学循环

• 批准号: 9217570
• 负责人: Christopher Martens
• 金额: $ 56.27万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9217570&HistoricalAwards=false
• 关键词: Biogeochemical; Cycling; Organic; Rich; Coastal

The project focuses on a question of fundamental importance for understanding the global oceanic carbon cycle: What factors and processes control whether organic matter deposited in marine sediments will be remineralized or buried. Organic matter deposition, remineralization, and burial will be studied at sites along transects in a shallow, highly productive North Carolina coastal lagoon and on the upper continental slope off Cape Hatteras, NC. Specific objectives include: (1) determination of how the fraction of organic carbon deposition that is remineralized varies along these two coastal transects, (2) determination of sources and ages of the reactive fraction, (3) determination of the chemical composition of reactive and unreactive fractions of the organic matter at sites along these transects, and (4) determination of the effect of respiratory mode on organic matter remineralization rates and chemical composition of buried material. Objectives (1), (2), and (3) involve extensive field work while objective (4) involves as well-controlled laboratory microcosm study. Combining field data and laboratory experiments provides a powerful tool for directly testing hypotheses regarding the mechanisms by which environmental parameters influence organic matter reactivity.

该项目着重于了解全球海洋碳周期的基本重要性：哪些因素和过程控制是否将沉积在海洋沉积物中的有机物将被重新矿化或埋葬。 有机物的沉积，回忆和埋葬将在沿着浅层，高效的北卡罗来纳州沿海泻湖和北卡罗来纳州哈特拉斯角沿外大陆山坡上的横断面进行研究。 具体目标包括：（1）确定被重新矿化的有机碳沉积的比例如何在这两个沿海样带上变化，（（2）确定反应性分数的来源和年龄，（（3）确定反应性和反应性分数的化学成分，沿现场的反应性和不反应分数对这些有效性的探讨，并确定（4）阶段，（4）级别的探讨，（4）的循环措施（4）级别的探讨。埋入材料的组成。 目标（1），（2）和（3）涉及广泛的现场工作，而客观（4）涉及控制良好的实验室微观研究。 结合现场数据和实验室实验提供了一种强大的工具，用于直接测试有关环境参数影响有机物反应性的机制的假设。