Fluxes of Dissolved Organic Matter form Marine Sediments

海洋沉积物中溶解有机物的通量

• 批准号: 9302120
• 负责人: David Burdige
• 金额: $ 24.99万
• 依托单位: Old Dominion University Research Foundation
• 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: 1993-08-01 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9302120&HistoricalAwards=false
• 关键词: Fluxes; Dissolved; Organic; Matter; form

9302120 Burdige Previous work has begun to illustrate the important role that dissolved organic carbon (DOC) fluxes from marine sediments play in oceanic and sedimentary carbon cycling. At the same time, benthic fluxes of dissolved organic nitrogen (DON) represent a poorly quantified component of sedimentary nitrogen remineralization that may be similarly important in oceanic and sedimentary nitrogen cycling. The goals of this proposal are therefore to continue studies of benthic DOC fluxes, and to begin studies examining benthic DON fluxes. Pore water DOC an DON studies will also be carried out in conjunction with these flux studies. In part, this work will examine the characteristics of pore water DOC and DON as they relate to the controls on benthic fluxes of DOC and DON. Our proposed work will be carried out at sites in the Chesapeake Bay on the California continental margin. Studies in continental margin sediments are of particular interest since several lines of evidence suggest that carbon and nitrogen cycling in margin sediments (and benthic fluxes of DOC and DON from margin sediments) may play important roles in oceanic carbon and nitrogen cycling. Given the range of characteristics among the sites chosen, the data will provide further insights into the factors controlling benthic fluxes of DOC and DON. These results will be used to improve estimates of the global DOC flux from marine sediments and to initiate a similar examination of the role of benthic DON fluxes in oceanic and sedimentary nitrogen cycling. Finally, these new results will be used to critically examine a model which may describe the relationship between benthic DOC fluxes and overall rates of benthic carbon remineralization.

小行星9302120 海洋沉积物中溶解有机碳（DOC）通量在海洋和沉积物碳循环中的重要作用已经开始被研究。与此同时，溶解有机氮（DON）的底栖通量代表了沉积氮矿化的一个很难量化的组成部分，这可能是同样重要的海洋和沉积氮循环。因此，本提案的目标是继续研究底栖DOC通量，并开始研究底栖DON通量。 孔隙水DOC和DON研究也将与这些通量研究一起进行。 部分，这项工作将检查的特点，孔隙水DOC和DON，因为它们涉及到控制底栖通量的DOC和DON。我们提议的工作将在加州大陆边缘的切萨皮克湾进行。 对大陆边沉积物的研究特别令人感兴趣，因为若干证据表明，大陆边沉积物中的碳和氮循环（以及来自大陆边沉积物的DOC和DON的底栖通量）可能在海洋碳和氮循环中发挥重要作用。考虑到所选站点的特性范围，这些数据将进一步深入了解DOC和DON的底栖通量控制因素。 这些结果将被用来提高估计全球DOC通量从海洋沉积物，并启动一个类似的检查底栖DON通量在海洋和沉积氮循环中的作用。最后，这些新的结果将被用来严格审查一个模型，该模型可以描述底栖DOC通量和底栖碳矿化的总体速率之间的关系。