SGER: The Oxygen Isotope Ratio of Organic Phosphorus Compounds What controles the isotopic fractionation? A first step towards a new proxy

这个私家侦探将探讨利用氧同位素系统学在有机磷化合物（d18Oop）作为一种工具，用于确定社区内的透光带磷利用率。 磷（P）的海洋生物地球化学循环与大气中的CO2丰度有着错综复杂的联系，因为它是一种重要的主要营养素，也可能是地质时间尺度上的最终限制性营养素。与氮和硅不同，磷只有一个稳定的同位素，因此与磷酸盐利用相关的同位素分馏尚未应用于该系统。 这将通过（1）旨在确定影响d18Oop的环境因素（温度、磷酸盐浓度、生长水和食物来源的d18O、物种组成和生长速率）的培养实验和（2）旨在评价与分析方法相关的潜在人为因素的实验来完成。这一建议有可能提供一个独特的和强大的工具来调查现在和过去的磷利用和循环，以及如何在空间和时间上发生变化，并与全球气候变化。

This P.I. will explore the utility of oxygen isotope systematics in organic P compounds (d18Oop) as a tool for determining community P utilization rate within the euphotic zone. The marine biogeochemical cycle of phosphorus (P) is intricately linked to the atmospheric abundance of CO2 through its role as an important major nutrient and possibly the ultimate limiting nutrient on geological time scales. Unlike nitrogen and silica phosphorus has only one stable isotope and thus isotopic fractionations related to phosphate utilization has not been applied to this system. This would be done by (1) culture experiments geared toward determining the environmental factors (temperature, phosphate concentrations, d18O of growth water and food source, species composition and growth rate) affecting the d18Oop and, (2) experiments designed to evaluate potential artifacts associated with the analytical procedure. This proposal has the potential to provide a unique and powerful tool to investigate present and past P utilization and cycling, and how this might have changed in space and time and in relation to global climate change.