Multitracers to Predict Paleoproductivity in the California Current System from Sediment and Sediment Trap Materials

多示踪剂通过沉积物和沉积物捕集材料预测加州海流系统的古生产力

• 批准号: 8609366
• 负责人: Jack Dymond
• 金额: $ 64.2万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-04-15 至 1990-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8609366&HistoricalAwards=false
• 关键词: Multitracers; Predict; Paleoproductivity; California; Current

Long-term sediment trap deployment provide an opportunity to examine the fidelity of deep-sea sediments as recorders of near- surface oceanic processes. Such studies are important because a fundamental assumption of paleoceanographic research is that the micropaleontologic and sediment chemistry record can be used to examine changes in sea surface conditions over long geologic time scales. The present recommended award will support a multitracer study of the relation of "imput" and "preservation" in marine sediments. The use of stable isotope, geochemical, and micropaleontologic criteria should allow an accurate assessment of differences between deposited sediments and the initial surface water input. The field phase of the project will deploy an array of sediment traps in the California Current system which has strong seasonal gradients in net productivity and surface oceanography. Analyses on the sediment trap material and surface sediments will be used to develop a set of independent proxies for net productivity. Components most likely to provide this information include: biogenous, calcareous, and siliceous microfossils; barite and bio-limiting trace elements such as copper and zinc; and organic matter and certain of its nitrogenous compounds including iodine, bromine, and phosphorous. Such analyses should allow an accurate definition of those signal carriers most highly correlated to net biologic productivity. The principal investigators are highly qualified to undertake the field and analysis portion of the project and have successfully completed previous sediment trap projects. Funding is strongly recommended at the following levels: FY87 = $224,750; FY88 = $229,615; FY89 = $201,299.

长期沉积物收集器的部署提供了一个机会， 研究深海沉积物的保真度，作为近- 表层海洋过程 这些研究很重要，因为 古海洋学研究的基本假设是， 微体古生物和沉积物化学记录可用于 研究在漫长的地质时期内海面状况的变化 鳞片 目前建议的赔偿金将支持一个多示踪剂 海洋“输入”与“保存”关系研究 沉积物 稳定同位素、地球化学和 微体古生物学的标准应该允许准确的评估 沉积物和原始沉积物的差异 地表水输入 该项目的实地阶段将部署一系列 加州海流系统中的沉积物陷阱， 净生产力和表层海洋学的季节梯度。 对沉积物捕集器材料和表层沉积物的分析将 用于开发一组独立的代理， 生产力 最有可能提供此信息的组件 包括生物成因、钙质和硅质微体化石; 重晶石和生物限制性微量元素如铜和锌; 有机物和某些含氮化合物 包括碘、溴和磷。 这些分析应 允许最高度精确地定义那些信号载波 与净生物生产力相关。 主要研究人员具有很高的资格， 承担该项目的实地和分析部分， 成功地完成了以前的沉积物收集器项目。 资金 强烈建议在以下级别使用： 87财年= 224,750美元; 88财年= 229,615美元; 89财年= 201299美元。