Foraminiferal Trace-Element Paleothermometry During Transient Paleogene Climates: A Test of Stable Isotope-Based Paleoceanographic Reconstructions of the Late Paleocene Thermal Max

对形成氧同位素值的多重控制限制了我们对晚古新世热极大期和始新世-渐新世“温室-冰窖”过渡期间瞬态（~105年）极端气候的理解。该研究将把有孔虫的Mg:Ca比值与这些事件的现有有孔虫氧同位素记录结合起来，有孔虫的Mg:Ca比值被证明是高度依赖于温度的。由于海水Mg:Ca在这一时间尺度上实际上是恒定的，这种比较方法将提供一种方法(1)LPTM期间的分区温度和海水氧同位素（即盐度）动力学和(2)始新世-渐新世过渡期间的分区温度和海水氧同位素（即冰体积）动力学。这些数据对于检验现有的古气候假设、理解快速气候变化的机制以及整合地球历史的环境和生物成分至关重要。

9901447SchellenbergMultiple controls upon forminiferal oxygen isotope values limit our understanding of transient (~105 yr) climate extremes during the Late Paleocene Thermal Maximum and Eocene-Oligocene "Greenhouse-Icehouse" transition. The study will couple Mg:Ca ratios of foramifera, demonstrated to be highly temperature-dependent, with existing foraminiferal oxygen isotope records of these events. As seawater Mg:Ca over such time-scales is effectively constant, this comparative approach will provide a means to (1) partition temperature and seawater oxygen isotope (i.e., salinity) dynamics during the LPTM and (2) partition temperature and seawater oxygen isotope (i.e., ice-volume) dynamics during the Eocene-Oligocene transition. Such data is critical for testing existing paleoclimate hypotheses, understanding the mechanism of rapid climate change, and integrating environmental and biological components of Earth history.