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

0082416磷的海洋生物地球化学循环与海洋中常量元素和微量元素的分配以及大气中二氧化碳的丰度以及在较长时间尺度上的O2作为重要营养物质的作用有着复杂的联系。PIS的初步工作表明，磷酸盐风化通量的大陆来源中溶解的无机磷酸盐(D18Op)的氧同位素组成与深海来源的完全不同，并随深度而变化。海洋中d18Op在空间和时间上的变化可以用来估计控制溶解的无机磷的有效性和同位素组成的生物地球化学和物理过程的速率。为此，PIS建议使用新的采样和分析方法，在高温和BATS站点以及长岛海湾的豪萨顿河和康涅狄格河横断面上测量d18Op的深度分布。

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.