Paleoproductivity and Oceanic Nutrient Budgets

古生产力和海洋养分预算

• 批准号: 9819114
• 负责人: Margaret Delaney
• 金额: $ 39.22万
• 依托单位: University of California-Santa Cruz
• 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: 1999-03-01 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819114&HistoricalAwards=false
• 关键词: Paleoproductivity; Oceanic; Nutrient; Budgets

This project will address two questions concerning the long-term relationships between ocean production and nutrient cycles. (1) How do changes in export production affect nutrient burial? (2) What are the relative roles of nutrient supply from continental weathering and nutrient recycling from the sediments? Two Cenozoic time intervals will be studied: 38-20 Ma, incorporating periods of rapid variation in 13 C and climate, to determine the effect of varying production upon organic burial and CO2 drawdown, and 64-50 Ma, incorporating a sustained maximum in 13 C during a climatic warm phase, to determine how large-scale changes in the C cycle are related to production and nutrient burial. Analyses will include barite (as a tracer of production), reactive P (as tracer of nutrient burial), 13 C in bulk calcite, and %CaCO3, opal and organic C, using ODP cores from a variety of oceanic settings.

该项目将解决关于海洋生产和营养循环之间的长期关系的两个问题。(1)出口产量的变化如何影响养分埋藏？(2)大陆风化的养分供应和沉积物养分循环的相对作用是什么？将研究两个新生代时间间隔：38-20 Ma，包括13C和气候的快速变化时期，以确定不同产量对有机埋藏和二氧化碳排放的影响；-50 Ma，包括气候暖相期间13C的持续最大值，以确定C循环的大范围变化与生产和养分埋藏的关系。分析将包括重晶石(作为生产的示踪剂)、活性P(作为营养物质埋藏的示踪剂)、散装方解石中的13C以及%CaCO3、蛋白石和有机C，使用来自各种海洋环境的ODP型岩心。