Earth Sciences Postdoctoral Research Fellowship Award

古海洋学中一个尚未解决的争议是温暖， 咸底层水（WSBW），可能形成于低纬度地区， 局限性边缘盆地，现在出现在深水中 流通 稳定的氧和碳同位素数据表明WSBW 可能在过去的几个时期主导了海洋环流， 但陈旧的同位素特征并不是唯一的水体示踪剂。 由于Nd在海洋中的停留时间短， 不同水团的Nd同位素输入值， 系统可能是水团的保守示踪剂。 鱼牙 磷灰石可以通过Nd同位素提供深水记录。 这 研究应有助于评估的时机和机制， 鱼牙磷灰石中稀土元素的摄取 从两个具有不同岩性控制的深海地点采集的样品 对成岩作用的影响 这也能让我们确定 古新世/始新世界线上的鱼牙齿组成， 建议WSBS的形成。 海洋模式的重大变化 过去的环流会影响营养分布， 氧化还原条件，以及热量和空气/海洋的传递 直接影响全球的大气气体交换 气候

An unresolved controversy in paleoceanography is the role of warm, saline bottom water (WSBW), presumably formed at low latitudes in restricted marginal basins, now occurring in deep water circulation. Stable oxygen and carbon isotope data suggest WSBW may have dominated ocean circulation at several times in the past, but stale isotope signatures are not unique water mass tracers. Due to the short oceanic residence time of Nd and the distinct Nd isotope input values to different water masses, this Nd isotopic system may be a conservative tracer of water mass. Fish tooth apatite may provide a deep water record through Nd isotopes. This study should aid in evaluating the timing and mechanism of the rare earth element (REE) uptake in fish tooth apatite by examining samples from two deep sea sites with different lithologic controls on diagenetic alteration. It should also allow us to determine fish tooth composition across the Paleocene/Eocene boundary, a time of proposed WSBS formation. Major changes in the mode of ocean circulation in the past would impact nutrient distributions and redox conditions, as well as the transfer of heat and air/sea exchange of atmospheric gases that directly influence global climate.