The Oxygen Isotopic Composition of Phosphate in the Oceans: A New Tracer for Nutrient Sources and Nutrient Dynamics

海洋中磷酸盐的氧同位素组成：营养源和营养动态的新示踪剂

• 批准号: 0082416
• 负责人: Karl Turekian
• 金额: $ 15万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-15 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0082416&HistoricalAwards=false
• 关键词: Oxygen; Isotopic; Composition; Phosphate; Oceans

ABSTRACTOCE-0082416 The marine biogeochemical cycle of phosphorus is intricately linked to the partitioning of major and trace elements within the ocean and to the atmospheric abundance of CO2, and on longer time scales, O2, through its role as an important nutrient. Preliminary work by the PIs has shown that the oxygen isotopic composition of dissolved inorganic phosphate (d18Op) in continental sources of the weathering flux of phosphate is quite distinct from that of the deep ocean and varies with depth. These variations in space and time of the d18Op in the oceans can be used as a means of estimating the rates of the biogeochemical and physical processes that control the availability and the isotopic composition of dissolved inorganic phosphate. For this reason, the PIs propose to measure profiles of d18Op with depth at the HOT and BATS sites, as well as in transects of the Housatonic and Connecticut Rivers of Long Island Sound using new methodologies for sampling and analyses.

磷的海洋生物地球化学循环与海洋中主要元素和微量元素的分配以及大气中CO2的丰度有着错综复杂的联系，在更长的时间尺度上，O2通过其作为重要营养物的作用而与O2有着密切的联系。 研究所的初步工作表明，磷酸盐风化通量的大陆来源中溶解无机磷酸盐（d18Op）的氧同位素组成与深海的氧同位素组成截然不同，并随深度而变化。 海洋中d18Op在空间和时间上的这些变化可以用来估计控制溶解无机磷酸盐的可用性和同位素组成的地球化学和物理过程的速率。 因此，专业人员建议使用新的采样和分析方法，在HOT和BATS站点以及长岛海峡的胡萨托尼克和康涅狄格河的横断面上测量d18 Op随深度的剖面。